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2. High-frequency readout free from transmon multi-excitation resonances

Author

Kurilovich, Pavel D., Connolly, Thomas, Bøttcher, Charlotte G. L., Weiss, Daniel K., Hazra, Sumeru, Joshi, Vidul R., Ding, Andy Z., Nho, Heekun, Diamond, Spencer, Kurilovich, Vladislav D., Dai, Wei, Fatemi, Valla, Frunzio, Luigi, Glazman, Leonid I., and Devoret, Michel H.

Subjects
Quantum Physics, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Quantum computation will rely on quantum error correction to counteract decoherence. Successfully implementing an error correction protocol requires the fidelity of qubit operations to be well-above error correction thresholds. In superconducting quantum computers, measurement of the qubit state remains the lowest-fidelity operation. For the transmon, a prototypical superconducting qubit, measurement is carried out by scattering a microwave tone off the qubit. Conventionally, the frequency of this tone is of the same order as the transmon frequency. The measurement fidelity in this approach is limited by multi-excitation resonances in the transmon spectrum which are activated at high readout power. These resonances excite the qubit outside of the computational basis, violating the desired quantum non-demolition character of the measurement. Here, we find that strongly detuning the readout frequency from that of the transmon exponentially suppresses the strength of spurious multi-excitation resonances. By increasing the readout frequency up to twelve times the transmon frequency, we achieve a quantum non-demolition measurement fidelity of 99.93% with a residual probability of leakage to non-computational states of only 0.02%., Comment: 27 pages, 14 figures

Published
2025

3. Exact amplitudes of parametric processes in driven Josephson circuits

Author

Baskov, Roman, Weiss, Daniel K., and Girvin, Steven M.

Subjects
Quantum Physics
Abstract

We present a general approach for analyzing arbitrary parametric processes in Josephson circuits within a single degree of freedom approximation. Introducing a systematic normal-ordered expansion for the Hamiltonian of parametrically driven superconducting circuits we present a flexible procedure to describe parametric processes and to compare different circuit designs for particular applications. We obtain formally exact amplitudes (`supercoefficients') of these parametric processes for driven SNAIL-based and SQUID-based circuits. The corresponding amplitudes contain complete information about the circuit topology, the form of the nonlinearity, and the parametric drive, making them, in particular, well-suited for the study of the strong drive regime. We present a closed-form expression for supercoefficients describing circuits without stray inductors and a tractable formulation for those with it. We demonstrate the versatility of the approach by applying it to the estimation of Kerr-cat qubit Hamiltonian parameters and by examining the criterion for the emergence of chaos in Kerr-cat qubits. Additionally, we extend the approach to multi-degree-of-freedom circuits comprising multiple linear modes weakly coupled to a single nonlinear mode. We apply this generalized framework to study the activation of a beam-splitter interaction between two cavities coupled via driven nonlinear elements. Finally, utilizing the flexibility of the proposed approach, we separately derive supercoefficients for the higher-harmonics model of Josephson junctions, circuits with multiple drives, and the expansion of the Hamiltonian in the exact eigenstate basis for Josephson circuits with specific symmetries., Comment: 5 pages, 2 figures

Published
2025

6. Evidence-Based Decision Aid for Patients With Parkinson Disease: Protocol for Interview Study, Online Survey, and Two Randomized Controlled Trials

Author

Bientzle, Martina, Kimmerle, Joachim, Eggeling, Marie, Cebi, Idil, Weiss, Daniel, and Gharabaghi, Alireza

Subjects
Medicine, Computer applications to medicine. Medical informatics, R858-859.7
Abstract

BackgroundShared decision making is particularly important in situations with different treatment alternatives. For the treatment of idiopathic Parkinson disease, both pharmacological and surgical approaches can be applied. ObjectiveIn this research project, a series of studies will be conducted to investigate how decision aids for patients with idiopathic Parkinson disease should be designed in order to support the decision-making process. MethodsIn Study 1a, qualitative interviews will be conducted to determine which needs frequently occur for patients with idiopathic Parkinson disease. In Study 1b, the identified needs will then be rated for personal relevance by an independent group of patients in an online survey. In Study 2, a randomized controlled trial will be used to pretest different decision aids in a sample group of people who do not have a medical background and who do not have Parkinson disease. In Study 3, a randomized controlled trial will be used to investigate the effect of the decision aids that had been evaluated as positive in Study 2 with patients who have idiopathic Parkinson disease. ResultsThis series of studies received ethical approval in January 2020. As of June 2020, data collection for Study 1a has started, and it is estimated that Studies 1a, 1b, 2, and 3 will take approximately 4, 4, 6, and 6 months to complete, respectively. It is planned to present the results and analyses at international conferences and to submit the results to peer-reviewed journals for publication, once the studies have been completed. The findings will also be shared with clinicians and patients through presentations at information events. ConclusionsThis series of studies is intended to result in an evidence-based decision aid for patients with idiopathic Parkinson disease in order to support the informed and reflected shared decision-making process. We further intend to contribute to a deeper understanding of the individual preferences of patients with idiopathic Parkinson disease and the impact of those preferences on treatment decisions.

Published
2020
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10. Index

Author

Chopp, Rebecca, Frost, Susan, and Weiss, Daniel H.

Published
2013

14. Contributors

Author

Chopp, Rebecca, Frost, Susan, and Weiss, Daniel H.

Published
2013

34. Acknowledgments

Author

Chopp, Rebecca, Frost, Susan, and Weiss, Daniel H.

Published
2013

35. Preface

Author

Chopp, Rebecca, Frost, Susan, and Weiss, Daniel H.

Published
2013

37. Prehospital telemedicine support for urban stroke care: Analysis of current state of care and conceptualization

Author

Weiss, Daniel, Rubbert, Christian, Kaschner, Marius, Greiner, Gregory Gordon, Kairies-Schwarz, Nadja, Vomhof, Markus, Icks, Andrea, Weitz, Linea, Hollenberg, Hanna, Jansen, Robin, Menge, Til, Seitz, Rüdiger J., Jander, Sebastian, Bernhard, Michael, Lee, John-Ih, Ruck, Tobias, Meuth, Sven Guenther, Turowski, Bernd, Caspers, Julian, and Gliem, Michael

Published
2024
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42. Fine-scale maps of malaria incidence to inform risk stratification in Laos

Author

Kang, Su Yun, Amratia, Punam, Dunn, Julia, Vilay, Phoutnalong, Connell, Mark, Symons, Tasmin, Rumisha, Susan, Zhang, Song, Ward, Abigail, Sichanthongthip, Odai, Banouvong, Virasack, Shortus, Mathew, Reyburn, Rita, Butphomvihane, Phonephet, Phiphakavong, Vilaisak, Hahm, Mary, Phongchantha, Vilayphone, Khamlome, Boualam, Chindavongsa, Keobouphaphone, Chanthavisouk, Chitsavang, Weiss, Daniel J., Gething, Peter W., and Cameron, Ewan

Published
2024
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43. Human movement and environmental barriers shape the emergence of dengue

Author

Harish, Vinyas, Colón-González, Felipe J., Moreira, Filipe R. R., Gibb, Rory, Kraemer, Moritz U. G., Davis, Megan, Reiner, Jr., Robert C., Pigott, David M., Perkins, T. Alex, Weiss, Daniel J., Bogoch, Isaac I., Vazquez-Prokopec, Gonzalo, Saide, Pablo Manrique, Barbosa, Gerson L., Sabino, Ester C., Khan, Kamran, Faria, Nuno R., Hay, Simon I., Correa-Morales, Fabián, Chiaravalloti-Neto, Francisco, and Brady, Oliver J.

Published
2024
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49. Wie die Umsetzung einer Schule für Menschen mit Parkinson-Krankheit gelingen kann – Ergebnisse eines Konsensusverfahrens und einer formativen Evaluation

Author

Gerschel, Tanita, Prokop, Scally, Schulze, Lara, Feige, Tim, Zschieschang, Anja, Barbe, Michael Thomas, Bitterlich, Robert, Caffier, Julian, Csoti, Ilona, Eggers, Carsten, Gaßner, Heiko, Gülke, Eileen, Hähnel, Tom, Herbst, Heinz, Jochim, Angela, Kiparski, Anni, Klietz, Martin, von Liel, Alexa, Lingor, Paul, Loewenbrück, Kai, Maetzler, Walter, Pürner, Dominik, van Riesen, Christoph, Schmitz-Pfeiffer, Henning, Süß, Thorsten, Tönges, Lars, Weiß, Daniel, Wolz, Martin, and Falkenburger, Björn

Published
2024
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