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391 results on '"Gu, Mile"'

156. The thermodynamical cost of some interpretations of quantum theory. Reply to Prunkl and Timpson, and Davidsson

Author

Cabello, Ad��n, Gu, Mile, G��hne, Otfried, Larsson, Jan-��ke, and Wiesner, Karoline

Subjects
Quantum Physics, quant-ph, FOS: Physical sciences, Quantum Physics (quant-ph)
Abstract

Here we clarify the assumptions made and conclusions reached in our paper "The thermodynamical cost of some interpretations of quantum theory" [Phys. Rev. A 94, 052127 (2016)], at the light of the criticisms of Prunkl and Timpson [Stud. Hist. Philos. Sci. Part B 63, 114 (2018)], and Davidsson (Master thesis, Stockholm University, 2018). We point out some misunderstandings and some weaknesses of the counterexample Prunkl and Timpson present to challenge our conclusion. We thus conclude, once more, that interpretations of quantum theory which consider the probabilities of measurement outcomes to be determined by objective properties of the measured system and satisfy the assumption that the measured system only has finite memory have a thermodynamical cost., 5 pages

Published
2019

161. Modular quantum computation in a trapped ion system

Author

Zhang, Kuan, primary, Thompson, Jayne, additional, Zhang, Xiang, additional, Shen, Yangchao, additional, Lu, Yao, additional, Zhang, Shuaining, additional, Ma, Jiajun, additional, Vedral, Vlatko, additional, Gu, Mile, additional, and Kim, Kihwan, additional

Published
2019
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166. Continuous variable qumodes as non-destructive probes of quantum systems

Author

Elliott, Thomas J., Gu, Mile, Thompson, Jayne, and Liu, Nana

Subjects
Quantum Physics, Statistical Mechanics (cond-mat.stat-mech), Quantum Gases (cond-mat.quant-gas), FOS: Physical sciences, Quantum Physics (quant-ph), Condensed Matter - Quantum Gases, Condensed Matter - Statistical Mechanics
Abstract

With the rise of quantum technologies, it is necessary to have practical and preferably non-destructive methods to measure and read-out from such devices. A current line of research towards this has focussed on the use of ancilla systems which couple to the system under investigation, and through their interaction, enable properties of the primary system to be imprinted onto and inferred from the ancillae. We propose the use of continuous variable qumodes as ancillary probes, and show that the interaction Hamiltonian can be fully characterised and directly sampled from measurements of the qumode alone. We suggest how such probes may also be used to determine thermodynamical properties, including reconstruction of the partition function. We show that the method is robust to realistic experimental imperfections such as finite-sized measurement bins and squeezing, and discuss how such probes are already feasible with current experimental setups., 8 pages, 3 figures

Published
2017

182. Overarching framework between Gaussian quantum discord and Gaussian quantum illumination

Author

Bradshaw, Mark, Assad, Syed M., Haw, Jing Yan, Tan, Si-Hui, Lam, Ping Koy, Gu, Mile, Bradshaw, Mark, Assad, Syed M., Haw, Jing Yan, Tan, Si-Hui, Lam, Ping Koy, and Gu, Mile

Abstract

We cast the problem of illuminating an object in a noisy environment into a communication protocol. A probe is sent into the environment, and the presence or absence of the object constitutes a signal encoded on the probe. The probe is then measured to decode the signal. We calculate the Holevo information and bounds to the accessible information between the encoded and received signal with two different Gaussian probes---an Einstein-Podolsky-Rosen (EPR) state and a coherent state. We also evaluate the Gaussian discord consumed during the encoding process with the EPR probe. We find that the Holevo quantum advantage, defined as the difference between the Holevo information obtained from the EPR and coherent state probes, is approximately equal to the discord consumed. These quantities become exact in the typical illumination regime of low object reflectivity and low probe energy. Hence we show that discord is the resource responsible for the quantum advantage in Gaussian quantum illumination.

Published
2017

186. Thermodynamical cost of some interpretations of quantum theory

Author

Cabello, Adan, Gu, Mile, Guehne, Otfried, Larsson, Jan-Åke, Wiesner, Karoline, Cabello, Adan, Gu, Mile, Guehne, Otfried, Larsson, Jan-Åke, and Wiesner, Karoline

Abstract

The interpretation of quantum theory is one of the longest-standing debates in physics. Type I interpretations see quantum probabilities as determined by intrinsic properties of the observed system. Type II see them as relational experiences between an observer and the system. It is usually believed that a decision between these two options cannot be made simply on purely physical grounds but requires an act of metaphysical judgment. Here we show that, under some assumptions, the problem is decidable using thermodynamics. We prove that type I interpretations are incompatible with the following assumptions: (i) The choice of which measurement is performed can be made randomly and independently of the system under observation, (ii) the system has limited memory, and (iii) Landauers erasure principle holds., Funding Agencies|FQXi large grant project "The Nature of Information in Sequential Quantum Measurements" [FIS2011-29400, FIS2014-60843-P]; FEDER funds; DFG; John Templeton Foundation [54914]; Singapore National Research Foundation under NRF Award [NRF-NRFF2016-02]; ERC [683107/TempoQ]; EPSRC [EP/E5012141/1]

Published
2016
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187. Power of one qumode for quantum computation

Author

Massachusetts Institute of Technology. Department of Mechanical Engineering, Massachusetts Institute of Technology. Research Laboratory of Electronics, Lloyd, Seth, Liu, Nana, Thompson, Jayne, Weedbrook, Christian, Vedral, Vlatko, Gu, Mile, Modi, Kavan, Massachusetts Institute of Technology. Department of Mechanical Engineering, Massachusetts Institute of Technology. Research Laboratory of Electronics, Lloyd, Seth, Liu, Nana, Thompson, Jayne, Weedbrook, Christian, Vedral, Vlatko, Gu, Mile, and Modi, Kavan

Abstract

Although quantum computers are capable of solving problems like factoring exponentially faster than the best-known classical algorithms, determining the resources responsible for their computational power remains unclear. An important class of problems where quantum computers possess an advantage is phase estimation, which includes applications like factoring. We introduce a computational model based on a single squeezed state resource that can perform phase estimation, which we call the power of one qumode. This model is inspired by an interesting computational model known as deterministic quantum computing with one quantum bit (DQC1). Using the power of one qumode, we identify that the amount of squeezing is sufficient to quantify the resource requirements of different computational problems based on phase estimation. In particular, we can use the amount of squeezing to quantitatively relate the resource requirements of DQC1 and factoring. Furthermore, we can connect the squeezing to other known resources like precision, energy, qudit dimensionality, and qubit number. We show the circumstances under which they can likewise be considered good resources.

Published
2016

197. Discord as a quantum resource for bi-partite communication

Author

Chrzanowski, Helen, Gu, Mile, Assad, Syed, Symul, Thomas, Modi, Kavan, Ralph, Timothy Cameron, Vedral, Vlatko, Lam, Ping Koy, Chrzanowski, Helen, Gu, Mile, Assad, Syed, Symul, Thomas, Modi, Kavan, Ralph, Timothy Cameron, Vedral, Vlatko, and Lam, Ping Koy

Abstract

Coherent interactions that generate negligible entanglement can still exhibit unique quantum behaviour. This observation has motivated a search beyond entanglement for a complete description of all quantum correlations. Quantum discord is a promising candidate. Here, we experimentally demonstrate that under certain measurement constraints, discord between bipartite systems can be consumed to encode information that can only be accessed by coherent quantum interactions. The inability to access this information by any other means allows us to use discord to directly quantify this 'quantum advantage'.

Published
2014

198. Local Convertibility and the Quantum Simulation of Edge States in Many-Body Systems

Author

Massachusetts Institute of Technology. Department of Physics, Franchini, Fabio, Cui, Jian, Amico, Luigi, Fan, Heng, Gu, Mile, Korepin, Vladimir, Kwek, Leong Chuan, Vedral, Vlatko, Massachusetts Institute of Technology. Department of Physics, Franchini, Fabio, Cui, Jian, Amico, Luigi, Fan, Heng, Gu, Mile, Korepin, Vladimir, Kwek, Leong Chuan, and Vedral, Vlatko

Abstract

In some many-body systems, certain ground-state entanglement (Rényi) entropies increase even as the correlation length decreases. This entanglement nonmonotonicity is a potential indicator of nonclassicality. In this work, we demonstrate that such a phenomenon, known as lack of local convertibility, is due to the edge-state (de)construction occurring in the system. To this end, we employ the example of the Ising chain, displaying an order-disorder quantum phase transition. Employing both analytical and numerical methods, we compute entanglement entropies for various system bipartitions (A|B) and consider ground states with and without Majorana edge states. We find that the thermal ground states, enjoying the Hamiltonian symmetries, show lack of local convertibility if either A or B is smaller than, or of the order of, the correlation length. In contrast, the ordered (symmetry-breaking) ground state is always locally convertible. The edge-state behavior explains all these results and could disclose a paradigm to understand local convertibility in other quantum phases of matter. The connection we establish between convertibility and nonlocal, quantum correlations provides a clear criterion of which features a universal quantum simulator should possess to outperform a classical machine., Seventh Framework Programme (European Commission) (Marie Curie International Outgoing Fellowship Grant PIOF-PHY-276093)

Published
2014

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