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1,486 results on '"Wolf, Stefan"'

1. Shot-noise reduction for lattice Hamiltonians

Author

Eckstein, Timo, Mansuroglu, Refik, Wolf, Stefan, Nützel, Ludwig, Tasler, Stephan, Kliesch, Martin, and Hartmann, Michael J.

Subjects
Quantum Physics
Abstract

Efficiently estimating energy expectation values of lattice Hamiltonians on quantum computers is a serious challenge, where established techniques can require excessive sample numbers. Here we introduce geometric partitioning as a scalable alternative. It splits the Hamiltonian into subsystems that extend over multiple lattice sites, for which transformations between their local eigenbasis and the computational basis can be efficiently found. This allows us to reduce the number of measurements as we sample from a more concentrated distribution without diagonalizing the problem. For systems in an energy eigenstate, we prove a lower bound on the sampling number improvement over the "naive" mutually commuting local operator grouping, which grows with the considered subsystem size, consistently showing an advantage for our geometric partitioning strategy. Notably, our lower bounds do not decrease but increase for more correlated states (Theorem 1). For states that are weakly isotropically perturbed around an eigenstate, we show how the sampling number improvement translates to imperfect eigenstate improvements, namely measuring close to the true eigenbasis already for smaller perturbations (Theorem 2). We illustrate our findings on multiple two-dimensional lattice models incl. the transverse field XY- and Ising model as well as the Fermi Hubbard model., Comment: 17 + 12 pages, 5 + 0 figures

Published
2024

2. Flow of dynamical causal structures with an application to correlations

Author

Baumeler, Ämin and Wolf, Stefan

Subjects
Quantum Physics, General Relativity and Quantum Cosmology
Abstract

Causal models capture cause-effect relations both qualitatively - via the graphical causal structure - and quantitatively - via the model parameters. They offer a powerful framework for analyzing and constructing processes. Here, we introduce a tool - the flow of causal structures - to visualize and explore the dynamical aspect of classical-deterministic processes, arguably like those present in general relativity. The flow describes all possible ways in which the causal structure of a process can evolve. We also present an algorithm to construct its supergraph - the superflow - from the causal structure only. Consequently, the superflow of a given process may describe additional unrealizable evolutions of its causal structure. As an application, we show that if all leafs of a flow are trivial, then the corresponding process produces causal correlations only, i.e., correlations where past data influences future events only. This strengthens the result that processes, where the cycles in their causal structure are chordless, establish causal correlations only. We also discuss the main difficulties for the quantum generalization., Comment: 5 pages, 3 figures, 2 algorithms

Published
2024

3. Solving an Industrially Relevant Quantum Chemistry Problem on Quantum Hardware

Author

Nützel, Ludwig, Gresch, Alexander, Hehn, Lukas, Marti, Lucas, Freund, Robert, Steiner, Alex, Marciniak, Christian D., Eckstein, Timo, Stockinger, Nina, Wolf, Stefan, Monz, Thomas, Kühn, Michael, and Hartmann, Michael J.

Subjects
Quantum Physics
Abstract

Quantum chemical calculations are among the most promising applications for quantum computing. Implementations of dedicated quantum algorithms on available quantum hardware were so far, however, mostly limited to comparatively simple systems without strong correlations. As such, they can also be addressed by classically efficient single-reference methods. In this work, we calculate the lowest energy eigenvalue of active space Hamiltonians of industrially relevant and strongly correlated metal chelates on trapped ion quantum hardware, and integrate the results into a typical industrial quantum chemical workflow to arrive at chemically meaningful properties. We are able to achieve chemical accuracy by training a variational quantum algorithm on quantum hardware, followed by a classical diagonalization in the subspace of states measured as outputs of the quantum circuit. This approach is particularly measurement-efficient, requiring 600 single-shot measurements per cost function evaluation on a ten qubit system, and allows for efficient post-processing to handle erroneous runs., Comment: 12 pages, 5 figures

Published
2024

4. On multivariate polynomials achievable with quantum signal processing

Author

Laneve, Lorenzo and Wolf, Stefan

Subjects
Quantum Physics
Abstract

Quantum signal processing (QSP) is a framework which was proven to unify and simplify a large number of known quantum algorithms, as well as discovering new ones. QSP allows one to transform a signal embedded in a given unitary using polynomials. Characterizing which polynomials can be achieved with QSP protocols is an important part of the power of this technique, and while such a characterization is well-understood in the case of univariate signals, it is unclear which multivariate polynomials can be constructed when the signal is a vector, rather than a scalar. This work uses a slightly different formalism than what is found in the literature, and uses it to find simpler necessary conditions for decomposability, as well as a sufficient condition - the first, to the best of our knowledge, proven for a (generally inhomogeneous) multivariate polynomial in the context of quantum signal processing., Comment: 11 pages, 2 figures, comments are welcome

Published
2024

7. Temperature as Joules per Bit

Author

Bédard, Charles Alexandre, Berthelette, Sophie, Coiteux-Roy, Xavier, and Wolf, Stefan

Subjects
Quantum Physics, Condensed Matter - Statistical Mechanics, Physics - Classical Physics
Abstract

Boltzmann's constant reflects a historical misunderstanding of the concept of entropy, whose informational nature is obfuscated when expressed in J/K. We suggest that the development of temperature and energy, historically prior to that of entropy, does not amount to their logical priority: Temperature should be defined in terms of entropy, not vice versa. Following the precepts of information theory, entropy is measured in bits, and coincides with information capacity at thermodynamic equilibrium. Consequently, not only is the temperature of an equilibrated system expressed in J/bit, but it acquires an operational meaning: It is the cost in energy to increase its information capacity by 1 bit. Our proposal also supports the notion of available capacity, analogous to free energy. Finally, it simplifies Landauer's cost and clarifies that it is a cost of displacement, not of erasure., Comment: 12 pages, 2 figures

Published
2024

9. Realism and causality imply information erasure by measurements

Author

Montina, Alberto and Wolf, Stefan

Subjects
Quantum Physics
Abstract

Quantum measurements generally introduce perturbations into the subsequent evolution of the measured system. Furthermore, a projective measurement cannot decrease the uncertainty on the system if the outcome is ignored; that is, the von Neumann entropy cannot decrease. However, under certain sound assumptions and using the quantum violation of Leggett-Garg inequalities, we demonstrate that this property is not inherited by a faithful classical causal simulation of a measurement process. In the simulation, a measurement erases previous information by performing a partial reset on the system. Thus, the measuring device acts as a low-temperature bath absorbing entropy from the measured system. Information erasure is a form of Spekkens' preparation contextuality. Our proof is straightforward if one assumes that maximal ignorance of the quantum state is compatible with maximal ignorance of the classical state. We also employ a weaker hypothesis. Information erasure is related to a theorem of Leifer and Pusey, which states that time symmetry implies retrocausality. In light of our findings, we discuss Spekkens' preparation contextuality, as well as a weakness in the hypothesis of time symmetry as defined by Leifer and Pusey., Comment: Corrected a mistake in the proof of theorem 1. Added some remarks

Published
2023

11. The Political Economy of Skill Formation in a Rentier State: The Case of Oman

Author

Langthaler, Margarita, Wolf, Stefan, and Schnitzler, Tobias

Abstract

Context: Against a backdrop of dwindling oil resources and increasing unemployment rates, the government of Oman has set out to diversify its industry and establish a knowledge-based economy. In this context, forming a highly-skilled Omani workforce is considered to be of crucial importance. Yet, the national TVET system suffers from low social status, poor quality, and limited labour market connectivity. This paper offers an analysis of Oman's TVET system in the socio-economic and cultural context of a rentier state. Approach: We draw on the political economy of skills and socio-cultural approaches that understand TVET systems and the broader skills regimes in which they are embedded as part and expression of particular patterns of the social organisation of work. This helps to locate TVET systems' strengths and weaknesses in the context of their underlying social relations instead of considering them as mere dysfunctionalities at the systemic level. This paper draws on an unpublished study on TVET for industrialisation commissioned by an Omani line ministry in cooperation with an international organisation. For this study, the authors carried out a literature review, undertook two field trips to Oman in 2018 and 2019 and conducted forty semi-structured interviews with stakeholders from government, private companies, business associations, and TVET and higher education institutions. Findings: Our analysis highlights how skill formation in Oman is shaped by the socioeconomic and cultural context of the Omani rentier state. First, the availability of cheap expatriate labour and Omanis' traditional preference for public sector jobs culminate in poor incentives for employing Omani nationals in the private sector. Second, reluctant employer attitudes towards national skill formation deepen quality issues in the TVET system, especially with regard to work-based training. This reinforces negative perceptions of the local workforce, which in turn contribute to biased employment patterns. Both social processes mutually reinforce each other, eventually preventing the emergence of strong national skill formation dynamics. Conclusions: While immediate structural change appears challenging, it is evident that reforms of the TVET system alone will not lead to its sustainable improvement. More research into how skill formation relates to Oman's specific socio-economic structures, how employment dynamics relate to educational credentials and how cultural traditions shape educational and work practices is needed.

Published
2022

13. Future Battery Market

Author

Wolf, Stefan, Lüken, Michael, Passerini, Stefano, editor, Barelli, Linda, editor, Baumann, Manuel, editor, Peters, Jens, editor, and Weil, Marcel, editor

Published
2024
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14. Battery Market Segmentation

Author

Wolf, Stefan, Olarte, Javier, Passerini, Stefano, editor, Barelli, Linda, editor, Baumann, Manuel, editor, Peters, Jens, editor, and Weil, Marcel, editor

Published
2024
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15. Unconditional Proofs-of-Work and Other Possibilities of Thermodynamic Cryptography

Author

Coiteux-Roy, Xavier and Wolf, Stefan

Subjects
Quantum Physics, Computer Science - Cryptography and Security
Abstract

In line with advances in recent years about realizing cryptographic functionalities in an information-theoretically secure way from physical phenomena and laws, we propose here to obtain useful tasks from the sole assumption of limited free energy. Specifically, based on that assumption -- resulting in a setting loosely related to Maurer's bounded-storage model -- we derive protocols for unconditional proofs-of-thermodynamical-work, secret sharing of free energy, unforgeable money, and proofs-of-position. While our schemes can be considered classical and not quantum per se, they are resistant against both classes of adversaries., Comment: 6 pages

Published
2022

16. An Algebraic-Geometry Approach to Prime Factorization

Author

Montina, Alberto and Wolf, Stefan

Subjects
Computer Science - Cryptography and Security, Computer Science - Computational Complexity, Mathematics - Algebraic Geometry, Mathematics - Number Theory, Quantum Physics
Abstract

New algorithms for prime factorization that outperform the existing ones or take advantage of particular properties of the prime factors can have a practical impact on present implementations of cryptographic algorithms that rely on the complexity of factorization. Currently used keys are chosen on the basis of the present algorithmic knowledge and, thus, can potentially be subject to future breaches. For this reason, it is worth to investigate new approaches which have the potentiality of giving a computational advantage. The problem has also relevance in quantum computation, as an efficient quantum algorithm for prime factorization already exists. Thus, better classical asymptotic complexity can provide a better understanding of the advantages offered by quantum computers. In this paper, we reduce the factorization problem to the search of points of parametrizable varieties, in particular curves, over finite fields. The varieties are required to have an arbitrarily large number of intersection points with some hypersurface over the base field. For a subexponential or poly- nomial factoring complexity, the number of parameters have to scale sublinearly in the space dimension n and the complexity of computing a point given the parameters has to be subexponential or polynomial, respectively. We outline a procedure for building these varieties, which is illustrated with two constructions. In one case, we show that there are varieties whose points can be evaluated efficiently given a number of parameters not greater than n/2. In the other case, the bound is dropped to n/3. Incidentally, the first construction resembles a kind of retro-causal model. Retro-causality is considered one possible explanation of quantum weirdness.

Published
2022

19. Interdisciplinary perspectives on computed tomography in sepsis: survey among medical doctors at a large university medical center

Author

Opper Hernando, Maria Isabel, Witham, Denis, Steinhagen, Peter Richard, Angermair, Stefan, Bauer, Wolfgang, Compton, Friederike, Edel, Andreas, Kruse, Jan, Kühnle, York, Lachmann, Gunnar, Marz, Susanne, Müller-Redetzky, Holger, Nee, Jens, Paul, Oliver, Praeger, Damaris, Skurk, Carsten, Stegemann, Miriam, Uhrig, Alexander, Wolf, Stefan, Zimmermann, Elke, Rubarth, Kerstin, Bolanaki, Myrto, Seybold, Joachim, Dewey, Marc, and Pohlan, Julian

Published
2023
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20. Key Agreement and Oblivious Transfer from Free-Energy Limitations

Author

Coiteux-Roy, Xavier and Wolf, Stefan

Subjects
Quantum Physics, Computer Science - Cryptography and Security
Abstract

We propose one of the very few constructive consequences of the second law of thermodynamics. More specifically, we present protocols for secret-key establishment and multiparty computation the security of which is based fundamentally on Landauer's principle. The latter states that the erasure cost of each bit of information is at least kTln2 (where k is Boltzmann's constant and T is the absolute temperature of the environment). Albeit impractical, our protocols explore the limits of reversible computation, and the only assumption about the adversary is her inability to access a quantity of free energy that is exponential in the one of the honest participants. Our results generalize to the quantum realm., Comment: 31 pages, 3 figures

Published
2022

21. The high-resolution map of Oxia Planum, Mars; the landing site of the ExoMars Rosalind Franklin rover mission

Author

Peter Fawdon, Csilla Orgel, Solmaz Adeli, Matt Balme, Fred J. Calef, Joel M. Davis, Alessandro Frigeri, Peter Grindrod, Ernst Hauber, Laetitia Le Deit, Damien Loizeau, Andrea Nass, Cathy Quantin-Nataf, Elliot Sefton-Nash, Nick Thomas, Ines Torres, Jorge L. Vago, Matthieu Volat, Sander De Witte, Francesca Altieri, Andrea Apuzzo, Julene Aramendia, Gorka Arana, Rickbir Singh Bahia, Steven G. Banham, Robert Barnes, Alexander M. Barrett, Wolf-Stefan Benedix, Anshuman Bhardwaj, Sarah Jane Boazman, Tomaso R. R. Bontognali, John Bridges, Benjamin Bultel, Valérie Ciarletti, Maria Cristina De Sanctis, Zach Dickeson, Elena A. Favaro, Marco Ferrari, Frédéric Foucher, Walter Goetz, Albert F. C. Haldemann, Elise Harrington, Angeliki Kapatza, Detlef Koschny, Agata M. Krzesinska, Alice Le Gall, Stephen R. Lewis, Tanya Lim, Juan Manuel Madariaga, Benjamin James Man, Lucia Mandon, Nicolas Mangold, Javier Martin-Torres, Joseph D. McNeil, Antonio Molina, Andoni G. Moral, Sara Motaghian, Sergei Nikiforov, Nicolas Oudart, Andrea Pacifici, Adam Parkes Bowen, Dirk Plettemeier, Pantelis Poulakis, Alfiah Rizky Diana Putri, Ottaviano Ruesch, Lydia Sam, Christian Schröder, Christoph Statz, Rebecca Thomas, Daniela Tirsch, Zsuzsanna Toth, Stuart Turner, Martin Voelker, Stephanie C. Werner, Frances Westall, Barry J. Whiteside, Adam Williams, Rebecca M. E. Williams, Jack Wright, and Maria-Paz Zorzano

Subjects
ExoMars, Oxia Planum, Mars, Geological Map, Astrobiology, Rosalind Franklin Rover, Maps, G3180-9980
Abstract

ABSTRACTThis 1:30,000 scale geological map describes Oxia Planum, Mars, the landing site for the ExoMars Rosalind Franklin rover mission. The map represents our current understanding of bedrock units and their relationships prior to Rosalind Franklin’s exploration of this location. The map details 15 bedrock units organised into 6 groups and 7 textural and surficial units. The bedrock units were identified using visible and near-infrared remote sensing datasets. The objectives of this map are (i) to identify where the most astrobiologically relevant rocks are likely to be found, (ii) to show where hypotheses about their geological context (within Oxia Planum and in the wider geological history of Mars) can be tested, (iii) to inform both the long-term (hundreds of metres to ∼1 km) and the short-term (tens of metres) activity planning for rover exploration, and (iv) to allow the samples analysed by the rover to be interpreted within their regional geological context.

Published
2024
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22. Thermodynamics as Combinatorics: A Toy Theory

Author

Baumeler, Ämin, Rieger, Carla, and Wolf, Stefan

Subjects
Quantum Physics, Computer Science - Information Theory
Abstract

We discuss a simple toy model which allows, in a natural way, for deriving central facts from thermodynamics such as its fundamental laws, including Carnot's version of the second principle. Our viewpoint represents thermodynamic systems as binary strings, and it links their temperature to their Hamming weight. From this, we can reproduce the possibility of negative temperatures, the notion of equilibrium as the co\"incidence of two notions of temperature - statistical versus structural -, as well as the zeroth law of thermodynamics (transitivity of the thermal-equilibrium relation), which we find to be redundant, as other authors, yet at the same time not to be universally valid., Comment: 6 pages, 5 figures

Published
2022

24. Parsimonious immune-response endotypes and global outcome in patients with traumatic brain injury

Author

Badjatia, Neeraj, Diaz-Arrastia, Ramon, Duhaime, Ann-Christine, Feeser, V Ramana, Gopinath, Shankar, Grandhi, Ramesh, Ha, Ruchira J., Keene, Dirk, Madden, Christopher, McCrea, Michael, Merchant, Randall, Ngwenya, Laura B., Rodgers, Richard B., Schnyer, David, Taylor, Sabrina R., Zafonte, Ross, Ackerlund, Cecilia, Amrein, Krisztina, Andelic, Nada, Andreassen, Lasse, Anke, Audny, Audibert, Gérard, Azouvi, Philippe, Azzolini, Maria Luisa, Bartels, Ronald, Beer, Ronny, Bellander, Bo-Michael, Benali, Habib, Berardino, Maurizio, Beretta, Luigi, Beqiri, Erta, Blaabjerg, Morten, Lund, Stine Borgen, Brorsson, Camilla, Buki, Andras, Cabeleira, Manuel, Caccioppola, Alessio, Calappi, Emiliana, Calvi, Maria Rosa, Cameron, Peter, Lozano, Guillermo Carbayo, Carbonara, Marco, Castaño-León, Ana M., Cavallo, Simona, Chevallard, Giorgio, Chieregato, Arturo, Citerio, Giuseppe, Clusmann, Hans, Coburn, Mark Steven, Coles, Jonathan, Cooper, Jamie D., Correia, Marta, Czeiter, Endre, Czosnyka, Marek, Dahyot-Fizelier, Claire, Dark, Paul, De Keyser, Véronique, Degos, Vincent, Della Corte, Francesco, Boogert, Hugo den, Depreitere, Bart, Đilvesi, Đula, Dixit, Abhishek, Dreier, Jens, Dulière, Guy-Loup, Ercole, Ari, Ezer, Erzsébet, Fabricius, Martin, Foks, Kelly, Frisvold, Shirin, Furmanov, Alex, Galanaud, Damien, Gantner, Dashiell, Ghuysen, Alexandre, Giga, Lelde, Golubović, Jagoš, Gomez, Pedro A., Gravesteijn, Benjamin, Grossi, Francesca, Gupta, Deepak, Haitsma, Iain, Helbok, Raimund, Helseth, Eirik, Huijben, Jilske, Hutchinson, Peter J., Jankowski, Stefan, Johnson, Faye, Karan, Mladen, Kolias, Angelos G., Kondziella, Daniel, Kornaropoulos, Evgenios, Koskinen, Lars-Owe, Kovács, Noémi, Kowark, Ana, Lagares, Alfonso, Laureys, Steven, Lecky, Fiona, Ledoux, Didier, Lightfoot, Roger, Lingsma, Hester, Maas, Andrew I.R., Manara, Alex, Maréchal, Hugues, Martino, Costanza, Mattern, Julia, McMahon, Catherine, Menon, David, Menovsky, Tomas, Misset, Benoit, Muraleedharan, Visakh, Murray, Lynnette, Negru, Ancuta, Nelson, David, Newcombe, Virginia, Nyirádi, József, Ortolano, Fabrizio, Payen, Jean-François, Perlbarg, Vincent, Persona, Paolo, Peul, Wilco, Piippo-Karjalainen, Anna, Ples, Horia, Pomposo, Inigo, Posti, Jussi P., Puybasset, Louis, Rădoi, Andreea, Ragauskas, Arminas, Raj, Rahul, Rhodes, Jonathan, Richter, Sophie, Rocka, Saulius, Roe, Cecilie, Roise, Olav, Rosenfeld, Jeffrey, Rosenlund, Christina, Rosenthal, Guy, Rossaint, Rolf, Rossi, Sandra, Sahuquillo, Juan, Sakowitz, Oliver, Sanchez-Porras, Renan, Sandrød, Oddrun, Schirmer-Mikalsen, Kari, Frederik Schou, Rico, Sewalt, Charlie, Smielewski, Peter, Sorinola, Abayomi, Stamatakis, Emmanuel, Steyerberg, Ewout W., Stocchetti, Nino, Sundström, Nina, Takala, Riikka, Tamás, Viktória, Tamosuitis, Tomas, Tenovuo, Olli, Thomas, Matt, Tibboel, Dick, Tolias, Christos, Trapani, Tony, Tudora, Cristina Maria, Unterberg, Andreas, Vajkoczy, Peter, Valeinis, Egils, Vallance, Shirley, Vámos, Zoltán, Van der Steen, Gregory, van Dijck, Jeroen T.J.M., van Essen, Thomas A., van Wijk, Roel, Vargiolu, Alessia, Vega, Emmanuel, Vik, Anne, Vilcinis, Rimantas, Volovici, Victor, Vulekovic, Peter, Wiegers, Eveline, Williams, Guy, Winzeck, Stefan, Wolf, Stefan, Younsi, Alexander, Zeiler, Frederick A., Ziverte, Agate, Zoerle, Tommaso, Samanta, Romit J., Chiollaz, Anne-Cécile, Needham, Edward, Yue, John K., Helmy, Adel, Zanier, Elisa R., Wang, Kevin K.W., Kobeissy, Firas, Summers, Charlotte, Manley, Geoffrey T., Maas, Andrew IR., Sanchez, Jean-Charles, and Menon, David K.

Published
2024
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25. Association of early blood-based biomarkers and six-month functional outcomes in conventional severity categories of traumatic brain injury: capturing the continuous spectrum of injury

Author

Ackerlund, Cecilia, Amrein, Krisztina, Andelic, Nada, Andreassen, Lasse, Anke, Audny, Antoni, Anna, Audibert, Gérard, Azouvi, Philippe, Azzolini, Maria Luisa, Bartels, Ronald, Barzó, Pál, Beauvais, Romuald, Beer, Ronny, Bellander, Bo-Michael, Belli, Antonio, Benali, Habib, Berardino, Maurizio, Beretta, Luigi, Blaabjerg, Morten, Bragge, Peter, Brazinova, Alexandra, Brinck, Vibeke, Brooker, Joanne, Brorsson, Camilla, Buki, Andras, Bullinger, Monika, Cabeleira, Manuel, Caccioppola, Alessio, Calappi, Emiliana, Calvi, Maria Rosa, Cameron, Peter, Lozano, Guillermo Carbayo, Carbonara, Marco, Castaño-León, Ana M., Cavallo, Simona, Chevallard, Giorgio, Chieregato, Arturo, Citerio, Giuseppe, Clusmann, Hans, Coburn, Mark Steven, Coles, Jonathan, Cooper, Jamie D., Correia, Marta, Čović, Amra, Curry, Nicola, Czeiter, Endre, Czosnyka, Marek, Dahyot-Fizelier, Claire, Dark, Paul, Dawes, Helen, De Keyser, Véronique, Degos, Vincent, Della Corte, Francesco, Boogert, Hugo den, Depreitere, Bart, Đilvesi, Đula, Dixit, Abhishek, Donoghue, Emma, Dreier, Jens, Dulière, Guy-Loup, Ercole, Ari, Esser, Patrick, Ezer, Erzsébet, Fabricius, Martin, Feigin, Valery L., Foks, Kelly, Frisvold, Shirin, Furmanov, Alex, Gagliardo, Pablo, Galanaud, Damien, Gantner, Dashiell, Gao, Guoyi, George, Pradeep, Ghuysen, Alexandre, Giga, Lelde, Glocker, Ben, Golubović, Jagoš, Gomez, Pedro A., Gratz, Johannes, Gravesteijn, Benjamin, Grossi, Francesca, Gruen, Russell L., Gupta, Deepak, Haagsma, Juanita A., Haitsma, Iain, Helbok, Raimund, Helseth, Eirik, Horton, Lindsay, Huijben, Jilske, Hutchinson, Peter J., Jacobs, Bram, Jankowski, Stefan, Jarrett, Mike, Jiang, Ji-yao, Johnson, Faye, Jones, Kelly, Karan, Mladen, Kolias, Angelos G., Kompanje, Erwin, Kondziella, Daniel, Kornaropoulos, Evgenios, Koskinen, Lars-Owe, Kovács, Noémi, Kowark, Ana, Lagares, Alfonso, Lanyon, Linda, Laureys, Steven, Lecky, Fiona, Ledoux, Didier, Lefering, Rolf, Legrand, Valerie, Lejeune, Aurelie, Levi, Leon, Lightfoot, Roger, Lingsma, Hester, Maegele, Marc, Majdan, Marek, Manara, Alex, Manley, Geoffrey, Maréchal, Hugues, Martino, Costanza, Mattern, Julia, McMahon, Catherine, Melegh, Béla, Menovsky, Tomas, Mikolic, Ana, Misset, Benoit, Muraleedharan, Visakh, Murray, Lynnette, Nair, Nandesh, Negru, Ancuta, Nelson, David, Nieboer, Daan, Nyirádi, József, Oresic, Matej, Ortolano, Fabrizio, Otesile, Olubukola, Palotie, Aarno, Parizel, Paul M., Payen, Jean-François, Perera, Natascha, Perlbarg, Vincent, Persona, Paolo, Peul, Wilco, Piippo-Karjalainen, Anna, Pirinen, Matti, Pisica, Dana, Ples, Horia, Polinder, Suzanne, Pomposo, Inigo, Posti, Jussi P., Puybasset, Louis, Rădoi, Andreea, Ragauskas, Arminas, Raj, Rahul, Rambadagalla, Malinka, Helmrich, Isabel Retel, Rhodes, Jonathan, Richardson, Sylvia, Richter, Sophie, Ripatti, Samuli, Rocka, Saulius, Roe, Cecilie, Roise, Olav, Rosand, Jonathan, Rosenfeld, Jeffrey, Rosenlund, Christina, Rosenthal, Guy, Rossaint, Rolf, Rossi, Sandra, Rueckert, Daniel, Rusnák, Martin, Sahuquillo, Juan, Sakowitz, Oliver, Sanchez-Porras, Renan, Sandor, Janos, Schäfer, Nadine, Schmidt, Silke, Schoechl, Herbert, Schoonman, Guus, Schou, Rico Frederik, Schwendenwein, Elisabeth, Singh, Ranjit D., Sewalt, Charlie, Skandsen, Toril, Smielewski, Peter, Sorinola, Abayomi, Stamatakis, Emmanuel, Stanworth, Simon, Stevens, Robert, Stewart, William, Steyerberg, Ewout W., Stocchetti, Nino, Sundström, Nina, Takala, Riikka, Tamás, Viktória, Tamosuitis, Tomas, Taylor, Mark Steven, Ao, Braden Te, Tenovuo, Olli, Theadom, Alice, Thomas, Matt, Thibaut, Aurore, Tibboel, Dick, Timmers, Marjolijn, Tolias, Christos, Trapani, Tony, Tudora, Cristina Maria, Unterberg, Andreas, Vajkoczy, Peter, Valeinis, Egils, Vallance, Shirley, Vámos, Zoltán, van der Jagt, Mathieu, van der Naalt, Joukje, Van der Steen, Gregory, van Dijck, Jeroen T.J.M., van Erp, Inge A., van Essen, Thomas A., Van Hecke, Wim, van Heugten, Caroline, Van Praag, Dominique, van Veen, Ernest, van Wijk, Roel P.J., Vyvere, Thijs Vande, Vargiolu, Alessia, Vega, Emmanuel, Velt, Kimberley, Verheyden, Jan, Vespa, Paul M., Vik, Anne, Vilcinis, Rimantas, Volovici, Victor, von Steinbüchel, Nicole, Voormolen, Daphne, Vulekovic, Peter, Wang, Kevin K.W., Wiegers, Eveline, Williams, Guy, Winzeck, Stefan, Wolf, Stefan, Yang, Zhihui, Ylén, Peter, Younsi, Alexander, Zeiler, Frederick A., Zelinkova, Veronika, Ziverte, Agate, Zoerle, Tommaso, Wilson, Lindsay, Newcombe, Virginia F.J., Whitehouse, Daniel P., Mondello, Stefania, Maas, Andrew I.R., and Menon, David K.

Published
2024
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27. Association of Fluid Balance and Hemoglobin Decline With Neurological Outcome After Aneurysmal Subarachnoid Hemorrhage

Author

Truckenmueller, Peter, Wolf, Stefan, Wasilewski, David, Vajkoczy, Peter, Früh, Anton, Baro, Norbert, Bauer, Miriam, Barner, Christoph, Dengler, Nora F., von Dincklage, Falk, Finger, Tobias, Francis, Roland, Hotter, Benjamin, Hunsicker, Oliver, Jussen, Daniel, Jüttler, Eric, Pohrt, Anne, Salih, Farid, Schaumann, Andreas, Witsch, Jens, Nagel, Christoph, Lemcke, Johannes, Meier, Ullrich, Podlesik, Dino, Schackert, Gabriele, Juratli, Tareq A., Huttner, Hagen, Schwab, Stefan, Staykov, Dimitre, Hagedorn, Sabine, Müller, Daniela, Müller, Oliver, Sarge, Robert, Sure, Ulrich, Bardutzky, Jürgen, Niesen, Wolf-Dirk, Lange, Katharina, Malinova, Vesna, Mielke, Dorothee, Rohde, Veit, Päsler, Dennis, Reinhardt, Stephanie, Schroeder, Henry W.S., Czorlich, Patrick, Regelsberger, Jan, Sauvigny, Thomas, Westphal, Manfred, Ehlert, Angelika, Gremmer, Rudolf, Beyer, Christian, Beyer, Desiree, Huthmann, Alexandra, Kerz, Thomas, Landscheidt, Julia, Schürer, Ludwig, Schul, David B., Meyer, Bernhard, Ryang, Yu-Mi, Toeroek, Elisabeth, Wostrack, Maria, Arouk, Wasim, Al-Jehani, Hosam, Fritsch, Michael, Al-Jehani, Hosam, Alturk, Abdulrahman Y., Sinclair, David B., Beck, Jürgen, Fung, Christian, Soell, Nicole, Engel, Doortje C., Hildebrandt, Gerhard, Huscher, Karen, Lange, Heidrun, Hutchinson, Peter, and Tseng, Ming-Yuan

Published
2024
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28. Decompressive craniectomy plus best medical treatment versus best medical treatment alone for spontaneous severe deep supratentorial intracerebral haemorrhage: a randomised controlled clinical trial

Author

Andereggen, Lukas, Beseoglu, Kerim, Cereda, Carlo, Coluccia, Daniel, Desfontaines, Philippe, Alonso de Leciñana, Maria, Freyschlag, Christian, Gaberel, Thomas, Gerlach, Rüdiger, Gessler, Florian, Güresir, Erdem, Muñoz, Fernando, Jabbarli, Ramazan, Minnerup, Jens, Moniche, Francisco, Peeters, Andre, Pfeilschifter, Waltraud, Tatlisumak, Turgut, Weiland, Judith, Woitzik, Johannes, Wostrack, Maria, Wunderlich, Silke, Vandertop, W.P., Beck, Jürgen, Fung, Christian, Strbian, Daniel, Bütikofer, Lukas, Z'Graggen, Werner J, Lang, Matthias F, Beyeler, Seraina, Gralla, Jan, Ringel, Florian, Schaller, Karl, Plesnila, Nikolaus, Arnold, Marcel, Hacke, Werner, Jüni, Peter, Mendelow, Alexander David, Stapf, Christian, Al-Shahi Salman, Rustam, Bressan, Jenny, Lerch, Stefanie, Hakim, Arsany, Martinez-Majander, Nicolas, Piippo-Karjalainen, Anna, Vajkoczy, Peter, Wolf, Stefan, Schubert, Gerrit A, Höllig, Anke, Veldeman, Michael, Roelz, Roland, Gruber, Andreas, Rauch, Philip, Mielke, Dorothee, Rohde, Veit, Kerz, Thomas, Uhl, Eberhard, Thanasi, Enea, Huttner, Hagen B, Kallmünzer, Bernd, Jaap Kappelle, L, Deinsberger, Wolfgang, Roth, Christian, Lemmens, Robin, Leppert, Jan, Sanmillan, Jose L, Coutinho, Jonathan M, Hackenberg, Katharina A M, Reimann, Gernot, Mazighi, Mikael, Bassetti, Claudio L A, Mattle, Heinrich P, Raabe, Andreas, and Fischer, Urs

Published
2024
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33. One-year employment outcome prediction after traumatic brain injury: A CENTER-TBI study

Author

Åkerlund, Cecilia, Amrein, Krisztina, Andelic, Nada, Andreassen, Lasse, Anke, Audny, Antoni, Anna, Audibert, Gérard, Azouvi, Philippe, Azzolini, Maria Luisa, Bartels, Ronald, Barzó, Pál, Beauvais, Romuald, Beer, Ronny, Bellander, Bo-Michael, Belli, Antonio, Benali, Habib, Berardino, Maurizio, Beretta, Luigi, Blaabjerg, Morten, Bragge, Peter, Brazinova, Alexandra, Brinck, Vibeke, Brooker, Joanne, Brorsson, Camilla, Buki, Andras, Bullinger, Monika, Cabeleira, Manuel, Caccioppola, Alessio, Calappi, Emiliana, Calvi, Maria Rosa, Cameron, Peter, Lozano, Guillermo Carbayo, Carbonara, Marco, Cavallo, Simona, Chevallard, Giorgio, Chieregato, Arturo, Citerio, Giuseppe, Clusmann, Hans, Coburn, Mark, Coles, Jonathan, Cooper, Jamie D., Correia, Marta, Čović, Amra, Curry, Nicola, Czeiter, Endre, Czosnyka, Marek, Dahyot-Fizelier, Claire, Dark, Paul, Dawes, Helen, De Keyser, Véronique, Degos, Vincent, Della Corte, Francesco, Boogert, Hugo den, Depreitere, Bart, Đilvesi, Đula, Dixit, Abhishek, Donoghue, Emma, Dreier, Jens, Dulière, Guy-Loup, Ercole, Ari, Esser, Patrick, Ezer, Erzsébet, Fabricius, Martin, Feigin, Valery L., Foks, Kelly, Frisvold, Shirin, Furmanov, Alex, Gagliardo, Pablo, Galanaud, Damien, Gantner, Dashiell, Gao, Guoyi, George, Pradeep, Ghuysen, Alexandre, Giga, Lelde, Glocker, Ben, Golubovic, Jagoš, Gomez, Pedro A., Gratz, Johannes, Gravesteijn, Benjamin, Grossi, Francesca, Gruen, Russell L., Gupta, Deepak, Haagsma, Juanita A., Haitsma, Iain, Helbok, Raimund, Helseth, Eirik, Horton, Lindsay, Huijben, Jilske, Hutchinson, Peter J., Jacobs, Bram, Jankowski, Stefan, Jarrett, Mike, Jiang, Ji-yao, Johnson, Faye, Jones, Kelly, Karan, Mladen, Kolias, Angelos G., Kompanje, Erwin, Kondziella, Daniel, Kornaropoulos, Evgenios, Koskinen, Lars-Owe, Kovács, Noémi, Kowark, Ana, Lagares, Alfonso, Lanyon, Linda, Laureys, Steven, Lecky, Fiona, Ledoux, Didier, Lefering, Rolf, Legrand, Valerie, Lejeune, Aurelie, Levi, Leon, Lightfoot, Roger, Lingsma, Hester, Maas, Andrew I.R., Castaño-León, Ana M., Maegele, Marc, Majdan, Marek, Manara, Alex, Manley, Geoffrey, Martino, Costanza, Maréchal, Hugues, Mattern, Julia, McMahon, Catherine, Melegh, Béla, Menon, David, Menovsky, Tomas, Mikolic, Ana, Misset, Benoit, Muraleedharan, Visakh, Murray, Lynnette, Negru, Ancuta, Nelson, David, Newcombe, Virginia, Nieboer, Daan, Nyirádi, József, Olubukola, Otesile, Oresic, Matej, Ortolano, Fabrizio, Palotie, Aarno, Parizel, Paul M., Payen, Jean-François, Perera, Natascha, Perlbarg, Vincent, Persona, Paolo, Peul, Wilco, Piippo-Karjalainen, Anna, Pirinen, Matti, Pisica, Dana, Ples, Horia, Polinder, Suzanne, Pomposo, Inigo, Posti, Jussi P., Puybasset, Louis, Radoi, Andreea, Ragauskas, Arminas, Raj, Rahul, Rambadagalla, Malinka, Helmrich, Isabel Retel, Rhodes, Jonathan, Richardson, Sylvia, Richter, Sophie, Ripatti, Samuli, Rocka, Saulius, Roe, Cecilie, Roise, Olav, Rosand, Jonathan, Rosenfeld, Jeffrey V., Rosenlund, Christina, Rosenthal, Guy, Rossaint, Rolf, Rossi, Sandra, Rueckert, Daniel, Rusnák, Martin, Sahuquillo, Juan, Sakowitz, Oliver, Sanchez-Porras, Renan, Sandor, Janos, Schäfer, Nadine, Schmidt, Silke, Schoechl, Herbert, Schoonman, Guus, Schou, Rico Frederik, Schwendenwein, Elisabeth, Sewalt, Charlie, Singh, Ranjit D., Skandsen, Toril, Smielewski, Peter, Sorinola, Abayomi, Stamatakis, Emmanuel, Stanworth, Simon, Stevens, Robert, Stewart, William, Steyerberg, Ewout W., Stocchetti, Nino, Sundström, Nina, Takala, Riikka, Tamás, Viktória, Tamosuitis, Tomas, Taylor, Mark Steven, Thibaut, Aurore, Ao, Braden Te, Tenovuo, Olli, Theadom, Alice, Thomas, Matt, Tibboel, Dick, Timmers, Marjolein, Tolias, Christos, Trapani, Tony, Tudora, Cristina Maria, Unterberg, Andreas, Vajkoczy, Peter, Vallance, Shirley, Valeinis, Egils, Vámos, Zoltán, van der Jagt, Mathieu, Van der Steen, Gregory, van der Naalt, Joukje, van Dijck, Jeroen T.J.M., van Erp, Inge A.M., van Essen, Thomas A., Van Hecke, Wim, van Heugten, Caroline, van Veen, Ernest, Vyvere, Thijs Vande, van Wijk, Roel P.J., Vargiolu, Alessia, Vega, Emmanuel, Velt, Kimberley, Verheyden, Jan, Vespa, Paul M., Vik, Anne, Vilcinis, Rimantas, Volovici, Victor, von Steinbüchel, Nicole, Voormolen, Daphne, Vulekovic, Petar, Wang, Kevin K.W., Whitehouse, Daniel, Wiegers, Eveline, Williams, Guy, Wilson, Lindsay, Winzeck, Stefan, Wolf, Stefan, Yang, Zhihui, Ylén, Peter, Younsi, Alexander, Zeiler, Frederick A., Zelinkova, Veronika, Ziverte, Agate, Zoerle, Tommaso, Van Deynse, Helena, Cools, Wilfried, De Deken, Viktor-Jan, Hubloue, Ives, Tisseghem, Ellen, and Putman, Koen

Published
2024
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34. Clinical descriptors of disease trajectories in patients with traumatic brain injury in the intensive care unit (CENTER-TBI): a multicentre observational cohort study

Author

Åkerlund, Cecilia, Amrein, Krisztina, Andelic, Nada, Andreassen, Lasse, Anke, Audny, Antoni, Anna, Audibert, Gérard, Azouvi, Philippe, Azzolini, Maria Luisa, Bartels, Ronald, Barzó, Pál, Beauvais, Romuald, Beer, Ronny, Bellander, Bo-Michael, Belli, Antonio, Benali, Habib, Berardino, Maurizio, Beretta, Luigi, Blaabjerg, Morten, Bragge, Peter, Brazinova, Alexandra, Brinck, Vibeke, Brooker, Joanne, Brorsson, Camilla, Buki, Andras, Bullinger, Monika, Cabeleira, Manuel, Caccioppola, Alessio, Calappi, Emiliana, Calvi, Maria Rosa, Cameron, Peter, Carbayo Lozano, Guillermo, Carbonara, Marco, Cavallo, Simona, Chevallard, Giorgio, Chieregato, Arturo, Citerio, Giuseppe, Clusmann, Hans, Coburn, Mark, Coles, Jonathan, Cooper, Jamie D., Correia, Marta, Čović, Amra, Curry, Nicola, Czeiter, Endre, Czosnyka, Marek, DahyotFizelier, Claire, Dark, Paul, Dawes, Helen, De Keyser, Véronique, Degos, Vincent, Della Corte, Francesco, den Boogert, Hugo, Depreitere, Bart, Đilvesi, Đula, Dixit, Abhishek, Donoghue, Emma, Dreier, Jens, Dulière, GuyLoup, Ercole, Ari, Esser, Patrick, Ezer, Erzsébet, Fabricius, Martin, Feigin, Valery L., Foks, Kelly, Frisvold, Shirin, Furmanov, Alex, Gagliardo, Pablo, Galanaud, Damien, Gantner, Dashiell, Gao, Guoyi, George, Pradeep, Ghuysen, Alexandre, Giga, Lelde, Glocker, Ben, Golubovic, Jagoš, Gomez, Pedro A., Gratz, Johannes, Gravesteijn, Benjamin, Grossi, Francesca, Gruen, Russell L., Gupta, Deepak, Haagsma, Juanita A., Haitsma, Iain, Helbok, Raimund, Helseth, Eirik, Horton, Lindsay, Huijben, Jilske, Hutchinson, Peter J., Jacobs, Bram, Jankowski, Stefan, Jarrett, Mike, Jiang, Jiyao, Johnson, Faye, Jones, Kelly, Karan, Mladen, Kolias, Angelos G., Kompanje, Erwin, Kondziella, Daniel, Kornaropoulos, Evgenios, Koskinen, LarsOwe, Kovács, Noémi, Kowark, Ana, Lagares, Alfonso, Lanyon, Linda, Laureys, Steven, Lecky, Fiona, Ledoux, Didier, Lefering, Rolf, Legrand, Valerie, Lejeune, Aurelie, Levi, Leon, Lightfoot, Roger, Lingsma, Hester, Maas, Andrew I.R., CastañoLeón, Ana M., Maegele, Marc, Majdan, Marek, Manara, Alex, Manley, Geoffrey, Martino, Costanza, Maréchal, Hugues, Mattern, Julia, McMahon, Catherine, Melegh, Béla, Menon, David, Menovsky, Tomas, Mikolic, Ana, Misset, Benoit, Muraleedharan, Visakh, Murray, Lynnette, Negru, Ancuta, Nelson, David, Newcombe, Virginia, Nieboer, Daan, Nyirádi, József, Olubukola, Otesile, Oresic, Matej, Ortolano, Fabrizio, Palotie, Aarno, Parizel, Paul M., Payen, JeanFrançois, Perera, Natascha, Perlbarg, Vincent, Persona, Paolo, Peul, Wilco, Piippo-Karjalainen, Anna, Pirinen, Matti, Pisica, Dana, Ples, Horia, Polinder, Suzanne, Pomposo, Inigo, Posti, Jussi P., Puybasset, Louis, Radoi, Andreea, Ragauskas, Arminas, Raj, Rahul, Rambadagalla, Malinka, Retel Helmrich, Isabel, Rhodes, Jonathan, Richardson, Sylvia, Richter, Sophie, Ripatti, Samuli, Rocka, Saulius, Roe, Cecilie, Roise, Olav, Rosand, Jonathan, Rosenfeld, Jeffrey V., Rosenlund, Christina, Rosenthal, Guy, Rossaint, Rolf, Rossi, Sandra, Rueckert, Daniel, Rusnák, Martin, Sahuquillo, Juan, Sakowitz, Oliver, SanchezPorras, Renan, Sandor, Janos, Schäfer, Nadine, Schmidt, Silke, Schoechl, Herbert, Schoonman, Guus, Schou, Rico Frederik, Schwendenwein, Elisabeth, Sewalt, Charlie, Singh, Ranjit D., Skandsen, Toril, Smielewski, Peter, Sorinola, Abayomi, Stamatakis, Emmanuel, Stanworth, Simon, Stevens, Robert, Stewart, William, Steyerberg, Ewout W., Stocchetti, Nino, Sundström, Nina, Takala, Riikka, Tamás, Viktória, Tamosuitis, Tomas, Taylor, Mark Steven, Ao, Braden Te, Tenovuo, Olli, Theadom, Alice, Thomas, Matt, Tibboel, Dick, Timmers, Marjolein, Tolias, Christos, Trapani, Tony, Tudora, Cristina Maria, Unterberg, Andreas, Vajkoczy, Peter, Vallance, Shirley, Valeinis, Egils, Vámos, Zoltán, van der Jagt, Mathieu, Van der Steen, Gregory, van der Naalt, Joukje, van Dijck, Jeroen T.J.M., van Erp, Inge A.M., van Essen, Thomas A., Van Hecke, Wim, van Heugten, Caroline, Van Praag, Dominique, van Veen, Ernest, Vande Vyvere, Thijs, van Wijk, Roel P.J., Vargiolu, Alessia, Vega, Emmanuel, Velt, Kimberley, Verheyden, Jan, Vespa, Paul M., Vik, Anne, Vilcinis, Rimantas, Volovici, Victor, von Steinbüchel, Nicole, Voormolen, Daphne, Vulekovic, Petar, Wang, Kevin K.W., Whitehouse, Daniel, Wiegers, Eveline, Williams, Guy, Wilson, Lindsay, Winzeck, Stefan, Wolf, Stefan, Yang, Zhihui, Ylén, Peter, Younsi, Alexander, Zeiler, Frederick A., Zelinkova, Veronika, Ziverte, Agate, Zoerle, Tommaso, Åkerlund, Cecilia A I, Holst, Anders, Bhattacharyay, Shubhayu, Steyerberg, Ewout, Menon, David K, and Nelson, David W

Published
2024
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35. On the Advantage of Irreversible Processes in Single-System Games

Author

Coiteux-Roy, Xavier and Wolf, Stefan

Subjects
Quantum Physics
Abstract

The CHSH no-signalling game studies Bell nonlocality by showcasing a gap between the win rates of classical strategies, quantum-entangled strategies, and no-signalling strategies. Similarly, the CHSH* single-system game explores the advantage of irreversible processes by showcasing a gap between the win rates of classical reversible strategies, quantum reversible strategies, and irreversible strategies. The irreversible process of erasure rules supreme for the CHSH* single-system game, but this ``erasure advantage'' does not necessarily extend to every single-system game: We introduce the 32-Game, in which reversibility is irrelevant and only the distinction between classical and quantum operations matters. We showcase our new insight by modifying the CHSH* game to make it erasure-immune, while conserving its quantum advantage. We conclude by the reverse procedure: We tune the 32-Game to make it erasure-vulnerable, and erase its quantum advantage in the process. The take-home message is that, when the size of the single-system is too small for Alice to encode her whole input, quantum advantage and erasure advantage can happen independently., Comment: 6 pages, 1 table, 3 figures

Published
2020

36. Wigner's Isolated Friend

Author

Hansen, Arne and Wolf, Stefan

Subjects
Quantum Physics, Physics - History and Philosophy of Physics
Abstract

The measurement problem is seen as an ambiguity of quantum mechanics, or, beyond that, as a contradiction within the theory: Quantum mechanics offers two conflicting descriptions of the Wigner's-friend experiment. As we argue in this note there are, however, obstacles from within quantum mechanics and regarding our perspective onto doing physics towards fully describing a measurement. We conclude that the ability to exhaustively describe a measurement is an assumption necessary for the common framing of the measurement problem and ensuing suggested solutions.

Published
2019

37. Comparative effectiveness of decompressive craniectomy versus craniotomy for traumatic acute subdural hematoma (CENTER-TBI): an observational cohort study

Author

Åkerlund, Cecilia, Amrein, Krisztina, Andelic, Nada, Andreassen, Lasse, Anke, Audny, Antoni, Anna, Audibert, Gérard, Azouvi, Philippe, Azzolini, Maria Luisa, Bartels, Ronald, Barzó, Pál, Beauvais, Romuald, Beer, Ronny, Bellander, Bo-Michael, Belli, Antonio, Benali, Habib, Berardino, Maurizio, Beretta, Luigi, Blaabjerg, Morten, Bragge, Peter, Brazinova, Alexandra, Brinck, Vibeke, Brooker, Joanne, Brorsson, Camilla, Buki, Andras, Bullinger, Monika, Cabeleira, Manuel, Caccioppola, Alessio, Calappi, Emiliana, Calvi, Maria Rosa, Cameron, Peter, Lozano, Guillermo Carbayo, Carbonara, Marco, Castaño-León, Ana M., Cavallo, Simona, Chevallard, Giorgio, Chieregato, Arturo, Citerio, Giuseppe, Clusmann, Hans, Coburn, Mark Steven, Coles, Jonathan, Cooper, Jamie D., Correia, Marta, Čović, Amra, Curry, Nicola, Czeiter, Endre, Czosnyka, Marek, Dahyot-Fizelier, Claire, Dark, Paul, Dawes, Helen, De Keyser, Véronique, Degos, Vincent, Della Corte, Francesco, Boogert, Hugo den, Depreitere, Bart, Đilvesi, Đula, Dixit, Abhishek, Donoghue, Emma, Dreier, Jens, Dulière, Guy-Loup, Ercole, Ari, Esser, Patrick, Ezer, Erzsébet, Fabricius, Martin, Feigin, Valery L., Foks, Kelly, Frisvold, Shirin, Furmanov, Alex, Gagliardo, Pablo, Galanaud, Damien, Gantner, Dashiell, Gao, Guoyi, George, Pradeep, Ghuysen, Alexandre, Giga, Lelde, Glocker, Ben, Golubović, Jagoš, Gomez, Pedro A., Gratz, Johannes, Gravesteijn, Benjamin, Grossi, Francesca, Gruen, Russell L., Gupta, Deepak, Haagsma, Juanita A., Haitsma, Iain, Helbok, Raimund, Helseth, Eirik, Horton, Lindsay, Huijben, Jilske, Hutchinson, Peter J., Jacobs, Bram, Jankowski, Stefan, Jarrett, Mike, Jiang, Ji-yao, Johnson, Faye, Jones, Kelly, Karan, Mladen, Kolias, Angelos G., Kompanje, Erwin, Kondziella, Daniel, Kornaropoulos, Evgenios, Koskinen, Lars-Owe, Kovács, Noémi, Lagares, Alfonso, Lanyon, Linda, Laureys, Steven, Lecky, Fiona, Ledoux, Didier, Lefering, Rolf, Legrand, Valerie, Lejeune, Aurelie, Levi, Leon, Lightfoot, Roger, Lingsma, Hester, Maas, Andrew I.R., Maegele, Marc, Majdan, Marek, Manara, Alex, Manley, Geoffrey, Maréchal, Hugues, Martino, Costanza, Mattern, Julia, McMahon, Catherine, Melegh, Béla, Menon, David, Menovsky, Tomas, Mikolic, Ana, Misset, Benoit, Muraleedharan, Visakh, Murray, Lynnette, Nair, Nandesh, Negru, Ancuta, Nelson, David, Newcombe, Virginia, Nieboer, Daan, Nyirádi, József, Oresic, Matej, Ortolano, Fabrizio, Otesile, Olubukola, Palotie, Aarno, Parizel, Paul M., Payen, Jean-François, Perera, Natascha, Perlbarg, Vincent, Persona, Paolo, Peul, Wilco, Piippo-Karjalainen, Anna, Pirinen, Matti, Pisica, Dana, Ples, Horia, Polinder, Suzanne, Pomposo, Inigo, Posti, Jussi P., Puybasset, Louis, Rădoi, Andreea, Ragauskas, Arminas, Raj, Rahul, Rambadagalla, Malinka, Rehorčíková, Veronika, Helmrich, Isabel Retel, Rhodes, Jonathan, Richardson, Sylvia, Richter, Sophie, Ripatti, Samuli, Rocka, Saulius, Roe, Cecilie, Roise, Olav, Rosand, Jonathan, Rosenfeld, Jeffrey, Rosenlund, Christina, Rosenthal, Guy, Rossaint, Rolf, Rossi, Sandra, Rueckert, Daniel, Rusnák, Martin, Sahuquillo, Juan, Sakowitz, Oliver, Sanchez-Porras, Renan, Sandor, Janos, Schäfer, Nadine, Schmidt, Silke, Schoechl, Herbert, Schoonman, Guus, Schou, Rico Frederik, Schwendenwein, Elisabeth, Sewalt, Charlie, Skandsen, Toril, Smielewski, Peter, Sorinola, Abayomi, Stamatakis, Emmanuel, Stanworth, Simon, Kowark, Ana, Stevens, Robert, Stewart, William, Steyerberg, Ewout W., Stocchetti, Nino, Sundström, Nina, Takala, Riikka, Tamás, Viktória, Tamosuitis, Tomas, Taylor, Mark Steven, Ao, Braden Te, Tenovuo, Olli, Theadom, Alice, Thomas, Matt, Tibboel, Dick, Timmers, Marjolijn, Tolias, Christos, Trapani, Tony, Tudora, Cristina Maria, Unterberg, Andreas, Vajkoczy, Peter, Valeinis, Egils, Vallance, Shirley, Vámos, Zoltán, Van der Jagt, Mathieu, van der Naalt, Joukje, Van der Steen, Gregory, van Dijck, Jeroen T.J.M., van Essen, Thomas A., Van Hecke, Wim, van Heugten, Caroline, Van Praag, Dominique, Van Veen, Ernest, van Wijk, Roel, Vyvere, Thijs Vande, Vargiolu, Alessia, Vega, Emmanuel, Velt, Kimberley, Verheyden, Jan, Vespa, Paul M., Vik, Anne, Vilcinis, Rimantas, Volovici, Victor, von Steinbüchel, Nicole, Voormolen, Daphne, Vulekovic, Petar, Wang, Kevin K.W., Wiegers, Eveline, Williams, Guy, Wilson, Lindsay, Winzeck, Stefan, Wolf, Stefan, Yang, Zhihui, Ylén, Peter, Younsi, Alexander, Zeiler, Frederick A., Ziverte, Agate, Zoerle, Tommaso, van Erp, Inge A.M., Lingsma, Hester F., Pisică, Dana, Yue, John K., Singh, Ranjit D., Kolias, Angelos, Peppel, Lianne D., Heijenbrok-Kal, Majanka, Ribbers, Gerard M., Menon, David K., Hutchinson, Peter J.A., Manley, Geoffrey T., de Ruiter, Godard C.W., and Peul, Wilco C.

Published
2023
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38. Reconstructing Policy Transfer in Adult and Vocational Education and Training

Author

Barabasch, Antje, Bohlinger, Sandra, and Wolf, Stefan

Abstract

The article contributes to the understanding of educational policy transfer with a particular focus on VET and labour-market related training. A review of VET policy transfer literature is followed by a description of travelling VET reforms in adult and vocational education and training around the globe. Historical foundations of VET policy transfer are described with an emphasis on lending and borrowing from the global North to the global South. Finally, contemporary forces that influence global policy transfer, derived from personal observation, are described. We aim to contribute to a better understanding of policy cycles by depicting the influence of different dynamics on decision-making for policy transfer in VET. We argue that there can be various reasons to policy transfer, not just attractiveness of a particular educational system or approach, but also global industry demands for workforce development or the influence of big data and social media.

Published
2021
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40. Measuring Measuring

Author

Hansen, Arne and Wolf, Stefan

Subjects
Quantum Physics, Physics - History and Philosophy of Physics
Abstract

Measurements play a crucial role in doing physics: Their results provide the basis on which we adopt or reject physical theories. In this note, we examine the effect of subjecting measurements themselves to our experience. We require that our contact with the world is empirically warranted. Therefore, we study theories that satisfy the following assumption: Interactions are accounted for so that they are empirically traceable, and observations necessarily go with such an interaction with the observed system. Examining, with regard to these assumptions, an abstract representation of measurements with tools from quantum logic leads us to contextual theories. Contextuality becomes a means to render interactions, thus also measurements, empirically tangible. The measurement becomes problematic---also beyond quantum mechanics---if one tries to commensurate the assumption of tangible interactions with the notion of a spectator theory, i.e., with the idea that measurement results are read off without effect. The problem, thus, presents itself as the collision of different epistemological stances with repercussions beyond quantum mechanics.

Published
2019

41. Coherent WDM transmission using quantum-dash mode-locked laser diodes as multi-wavelength source and local oscillator

Author

Kemal, Juned N., Marin-Palomo, Pablo, Panapakkam, Vivek, Trocha, Philipp, Wolf, Stefan, Merghem, Kamel, Lelarge, Francois, Ramdane, Abderrahim, Randel, Sebastian, Freude, Wolfgang, and Koos, Christian

Subjects
Physics - Applied Physics, Electrical Engineering and Systems Science - Signal Processing, Physics - Optics
Abstract

Quantum-dash (QD) mode-locked laser diodes (MLLD) lend themselves as chip-scale frequency comb generators for highly scalable wavelength-division multiplexing (WDM) links in future data-center, campus-area, or metropolitan networks. Driven by a simple DC current, the devices generate flat broadband frequency combs, containing tens of equidistant optical tones with line spacings of tens of GHz. Here we show that QD-MLLDs can not only be used as multi-wavelength light sources at a WDM transmitter, but also as multi-wavelength local oscillators (LO) for parallel coherent reception. In our experiments, we demonstrate transmission of an aggregate data rate of 4.1 Tbit/s (23x45 GBd PDM-QPSK) over 75 km standard single-mode fiber (SSMF). To the best of our knowledge, this represents the first demonstration of a coherent WDM link that relies on QD-MLLD both at the transmitter and the receiver.

Published
2019
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42. No master (key) No (measurement) problem

Author

Hansen, Arne and Wolf, Stefan

Subjects
Quantum Physics, Physics - History and Philosophy of Physics
Abstract

Can normal science-in the Kuhnian sense-add something substantial to the discussion about the measurement problem? Does an extended Wigner's-friend Gedankenexperiment illustrate new issues? Or a new quality of known issues? Are we led to new interpretations, new perspectives, or do we iterate the previously known? The recent debate does, as we argue, neither constitute a turning point in the discussion about the measurement problem nor fundamentally challenge the legitimacy of quantum mechanics. Instead, the measurement problem asks for a reflection on fundamental paradigms of doing physics.

Published
2019

43. Comb-based WDM transmission at 10 Tbit/s using a DC-driven quantum-dash mode-locked laser diode

Author

Marin-Palomo, Pablo, Kemal, Juned N., Trocha, Philipp, Wolf, Stefan, Merghem, Kamel, Lelarge, François, Ramdane, Abderrahim, Freude, Wolfgang, Randel, Sebastian, and Koos, Christian

Subjects
Electrical Engineering and Systems Science - Signal Processing, Physics - Optics
Abstract

Chip-scale frequency comb generators have the potential to become key building blocks of compact wavelength-division multiplexing (WDM) transceivers in future metropolitan or campus-area networks. Among the various comb generator concepts, quantum-dash (QD) mode-locked laser diodes (MLLD) stand out as a particularly promising option, combining small footprint with simple operation by a DC current and offering flat broadband comb spectra. However, the data transmission performance achieved with QD-MLLD was so far limited by strong phase noise of the individual comb tones, restricting experiments to rather simple modulation formats such as quadrature phase shift keying (QPSK) or requiring hard-ware-based compensation schemes. Here we demonstrate that these limitations can be over-come by digital symbol-wise phase tracking algorithms, avoiding any hardware-based phase-noise compensation. We demonstrate 16QAM dual-polarization WDM transmission on 38 channels at an aggregate net data rate of 10.68 Tbit/s over 75 km of standard single-mode fiber. To the best of our knowledge, this corresponds to the highest data rate achieved through a DC-driven chip-scale comb generator without any hardware-based phase-noise reduction schemes.

Published
2019
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44. Proving Erasure

Author

Coiteux-Roy, Xavier and Wolf, Stefan

Subjects
Computer Science - Cryptography and Security, Quantum Physics
Abstract

It seems impossible to certify that a remote hosting service does not leak its users' data --- or does quantum mechanics make it possible? We investigate if a server hosting data can information-theoretically prove its definite deletion using a "BB84-like" protocol. To do so, we first rigorously introduce an alternative to privacy by encryption: privacy delegation. We then apply this novel concept to provable deletion and remote data storage. For both tasks, we present a protocol, sketch its partial security, and display its vulnerability to eavesdropping attacks targeting only a few bits., Comment: 5 pages, 3 figures

Published
2019
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45. Contextuality: It's a Feature, not a Bug

Author

Hansen, Arne and Wolf, Stefan

Subjects
Quantum Physics
Abstract

Results of measurements give legitimacy to a physical theory. What if acquiring these results in the first place necessitates what the same theory considers to be an interaction? In this note, we assume that theories account for interactions so that they are empirically traceable, and that observations necessarily go with such an interaction with the observed system. We investigate consequences of this assumption: The unfolding language game, inspired by "quantum logic," leads to a class of contextual and probabilistic theories. Contextuality becomes a means to render interactions, thus also measurements, empirically tangible. The measurement "problem" arises in all such theories, not only quantum mechanics: It is a consequence of the need for empirical evidence of interactions. And a consequence of the converse need for an interaction when obtaining that empirical evidence.

Published
2019

46. The Free Energy of a General Computation

Author

Baumeler, Ämin and Wolf, Stefan

Subjects
Quantum Physics
Abstract

Starting from Landauer's slogan "information is physical," we revise and modify Landauer's principle stating that the erasure of information has a minimal price in the form of a certain quantity of free energy. We establish a direct link between the erasure cost and the work value of a piece of information, and show that the former is essentially the length of the string's best compression by a reversible computation. We generalize the principle by deriving bounds on the free energy to be invested for --- or gained from, for that matter --- a general computation. We then revisit the second law of thermodynamics and compactly rephrase it (assuming the Church/Turing/Deutsch hypothesis that physical reality can be simulated by a universal Turing machine): Time evolutions are logically reversible --- "the future fully remembers the past (but not necessarily vice versa)." We link this view to previous formulations of the second law, and we argue that it has a particular feature that suggests its "logico-informational" nature, namely simulation resilience: If a computation faithfully simulates a physical process violating the law --- then that very computation procedure violates it as well., Comment: 8 pages, 3 figures

Published
2019
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47. Wireless THz link with optoelectronic transmitter and receiver

Author

Harter, Tobias, Ummethala, Sandeep, Blaicher, Matthias, Muehlbrandt, Sascha, Wolf, Stefan, Weber, Marco, Adib, Md Mosaddek Hossain, Kemal, Juned N., Merboldt, Marco, Boes, Florian, Nellen, Simon, Tessmann, Axel, Walther, Martin, Globisch, Björn, Zwick, Thomas, Freude, Wolfgang, Randel, Sebastian, and Koos, Christian

Subjects
Physics - Applied Physics, Physics - Optics
Abstract

Photonics might play a key role in future wireless communication systems that operate at THz carrier frequencies. A prime example is the generation of THz data streams by mixing optical signals in high-speed photodetectors. Over the previous years, this concept has enabled a series of wireless transmission experiments at record-high data rates. Reception of THz signals in these experiments, however, still relied on electronic circuits. In this paper, we show that wireless THz receivers can also greatly benefit from optoelectronic signal processing techniques, in particular when carrier frequencies beyond 0.1 THz and wideband tunability over more than an octave is required. Our approach relies on a high-speed photoconductor and a photonic local oscillator for optoelectronic down-conversion of THz data signals to an intermediate frequency band that is easily accessible by conventional microelectronics. By tuning the frequency of the photonic local oscillator, we can cover a wide range of carrier frequencies between 0.03 THz and 0.34 THz. We demonstrate line rates of up to 10 Gbit/s on a single channel and up to 30 Gbit/s on multiple channels over a distance of 58 m. To the best of our knowledge, our experiments represent the first demonstration of a THz transmission link that exploits optoelectronic signal processing techniques both at the transmitter and the receiver., Comment: 7 pages Main Paper + 6 pages Supplementary Information

Published
2019
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49. A randomized, single ascending dose safety, tolerability and pharmacokinetics study of NicaPlant® in aneurysmal subarachnoid hemorrhage patients undergoing clipping

Author

Kerschbaumer, Johannes, Freyschlag, Christian Franz, Petr, Ondra, Adage, Tiziana, Breitenbach J, Joerg, Wessels, Lars, Wolf, Stefan, Hecht, Nils, Gempt, Jens, Wostrack, Maria, Gmeiner, Matthias, Gollwitzer, Maria, Stefanits, Harald, Bendszus M, Martin, Gruber, Andreas, Meyer, Bernhard, Vajkoczy, Peter, and Thomé, Claudius

Published
2023
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