Or Katz, Roy Shaham, and Ofer Firstenberg
PRX Quantum 3, 010305 (2022) - Published 10 January, 2022
By the accumulation of numerous random collisions, spins of noble gas and alkali gas can be strongly coupled, allowing for the exchange of non-classical states with high fidelity.
Mischa P. Woods, Ralph Silva, Gilles Pütz, Sandra Stupar, and Renato Renner
PRX Quantum 3, 010319 (2022) - Published 3 February, 2022
Treating a clock as a quantum mechanical system reveals a quadratically improved accuracy compared to a purely classical clock of the same size.
Joshua Ramette, Josiah Sinclair, Zachary Vendeiro, Alyssa Rudelis, Marko Cetina, and Vladan Vuletić
PRX Quantum 3, 010344 (2022) - Published 17 March, 2022
Full connectivity across many trapped ion and Rydberg modules is possible in a new quantum processor architecture that exploits optical cavities and heralded single photons.
Paweł Horodecki, Łukasz Rudnicki, and Karol Życzkowski
PRX Quantum 3, 010101 (2022) - Published 3 March, 2022
A list of open theoretical problems, which solutions could lead to breakthrough developments in quantum information, is thoughtfully suggested.
Michael Reitz, Christian Sommer, and Claudiu Genes
PRX Quantum 3, 010201 (2022) - Published 7 January, 2022
A pedagogical introduction to the consistent methods in open quantum systems dynamics, to treat electron-photon interactions in strongly coupled and correlated quantum emitter ensembles is presented.
Marco Barbieri
PRX Quantum 3, 010202 (2022) - Published 25 January, 2022
Beating metrological challenges with quantum light: The basic principles of parameter estimation are pedagogically explained, including fundamental experimental considerations.
Petr Zapletal, Andreas Nunnenkamp, and Matteo Brunelli
PRX Quantum 3, 010301 (2022) - Published 3 January, 2022
Multimode cat states can be stabilized and prepared in a scalable fashion using methods of dissipation engineering in conjunction with coupled arrays of nonlinear resonators.
Richard D.P. East, John van de Wetering, Nicholas Chancellor, and Adolfo G. Grushin
PRX Quantum 3, 010302 (2022) - Published 4 January, 2022
A graphical language based on the ZX-calculus is introduced to represent and reason about many-body states, providing an innovative and powerful tool for exploring condensed-matter physics.
Gabriel T. Landi, Mauro Paternostro, and Alessio Belenchia
PRX Quantum 3, 010303 (2022) - Published 5 January, 2022
Specific class of collisional models is shown to exhibit steady-states of matter which only exist because measurements are being performed continually.
Gonzalo Manzano, Juan M.R. Parrondo, and Gabriel T. Landi
PRX Quantum 3, 010304 (2022) - Published 6 January, 2022
A theory for quantum transport with non-commuting operators is developed and applied to the joint problems of the transport of heat and radiation squeezing.
Or Katz, Roy Shaham, and Ofer Firstenberg
PRX Quantum 3, 010305 (2022) - Published 10 January, 2022
By the accumulation of numerous random collisions, spins of noble gas and alkali gas can be strongly coupled, allowing for the exchange of non-classical states with high fidelity.
Nicolás Quesada, Rachel S. Chadwick, Bryn A. Bell, Juan Miguel Arrazola, Trevor Vincent, Haoyu Qi, and Raúl García−Patrón
PRX Quantum 3, 010306 (2022) - Published 11 January, 2022
A method to reduce the problem of simulating Gaussian boson sampling to the one of computing pure-state probability amplitudes is developed and benchmarked.
Kaushik Joarder, Debashis Saha, Dipankar Home, and Urbasi Sinha
PRX Quantum 3, 010307 (2022) - Published 12 January, 2022
Experiment shows an unambiguous violation of macro-realism for single photons using different versions of Leggett-Garg inequalities with non-invasive measurements, also providing a powerful platform for harnessing the non-classicality of photons in quantum technologies.
Tamara Kohler, Stephen Piddock, Johannes Bausch, and Toby Cubitt
PRX Quantum 3, 010308 (2022) - Published 13 January, 2022
The simulation ability of quantum Hamiltonians that can be used to analogue simulate all other Hamiltonians, is classified by their complexity classes.
Andrew Eddins, Mario Motta, Tanvi P. Gujarati, Sergey Bravyi, Antonio Mezzacapo, Charles Hadfield, and Sarah Sheldon
PRX Quantum 3, 010309 (2022) - Published 14 January, 2022
A method of classically forged entanglement is used to simulate a 2N-qubit system with only N qubits, which is illustrated on the case of 5 qubits simulating 10 spin orbitals of the ground state of the water molecule.
Kaavya Sahay and Benjamin J. Brown
PRX Quantum 3, 010310 (2022) - Published 18 January, 2022
An efficient matching decoder for the color code with boundaries that corrects high-weight errors is proposed, leading to competitive results of practical relevance.
Cillian Harney and Stefano Pirandola
PRX Quantum 3, 010311 (2022) - Published 19 January, 2022
A generalization of discrete-modulation for quantum communication is presented, allowing one to encode classical information into global multi-mode features rather than local modulations.
Gustav Andersson, Shan W. Jolin, Marco Scigliuzzo, Riccardo Borgani, Mats O. Tholén, J.C. Rivera Hernández, Vitaly Shumeiko, David B. Haviland, and Per Delsing
PRX Quantum 3, 010312 (2022) - Published 20 January, 2022
A parametric surface acoustic wave resonator is developed using a superconducting architecture and used to demonstrate multimode entanglement of acoustic phonons.
Zoë Holmes, Kunal Sharma, M. Cerezo, and Patrick J. Coles
PRX Quantum 3, 010313 (2022) - Published 24 January, 2022
A fundamental relationship between expressibility and trainability of an ansatz is derived, providing designing strategies that help to avoid barren plateaus.
Josiah Sinclair, Daniela Angulo, Kyle Thompson, Kent Bonsma-Fisher, Aharon Brodutch, and Aephraim M. Steinberg
PRX Quantum 3, 010314 (2022) - Published 26 January, 2022
If a resonant photon gets transmitted through an absorptive atom cloud, does it nevertheless cause atoms to spend time in the excited state?
Kyungjoo Noh, Christopher Chamberland, and Fernando G.S.L. Brandão
PRX Quantum 3, 010315 (2022) - Published 28 January, 2022
A highly-optimized version of the surface-GKP code is introduced, showing how to ease the requirements to achieve fault-tolerance and prepare the necessary GKP state.
Chuan-Hsun Li, Yangqian Yan, Shih-Wen Feng, Sayan Choudhury, David B. Blasing, Qi Zhou, and Yong P. Chen
PRX Quantum 3, 010316 (2022) - Published 31 January, 2022
The atomic quantum simulator is built to mimic solid-state material in a curved space, observing the emergence of topological features in such a system.
Aleksandra Gočanin, Ivan Šupić, and Borivoje Dakić
PRX Quantum 3, 010317 (2022) - Published 1 February, 2022
A systematic approach with optimal sample efficiency is presented to bridge the gap between needed theoretical simplifications and real-life conditions.
Lin Lin and Yu Tong
PRX Quantum 3, 010318 (2022) - Published 2 February, 2022
A highly-optimized approach to eigenvalue estimation is presented, circumvented many drawbacks of traditional methods, such as qubits overhead.
Mischa P. Woods, Ralph Silva, Gilles Pütz, Sandra Stupar, and Renato Renner
PRX Quantum 3, 010319 (2022) - Published 3 February, 2022
Treating a clock as a quantum mechanical system reveals a quadratically improved accuracy compared to a purely classical clock of the same size.
Hirsh Kamakari, Shi-Ning Sun, Mario Motta, and Austin J. Minnich
PRX Quantum 3, 010320 (2022) - Published 4 February, 2022
Two quantum algorithms to simulate the dynamics of open quantum systems weakly interacting with the environment are developed that can be applied in variety of different scenarios.
Dominic Gribben, Dominic M. Rouse, Jake Iles-Smith, Aidan Strathearn, Henry Maguire, Peter Kirton, Ahsan Nazir, Erik M. Gauger, and Brendon W. Lovett
PRX Quantum 3, 010321 (2022) - Published 7 February, 2022
An efficient method was developed to simulate solid-state open systems that are simultaneously influenced by several kinds of environments in a non-perturbative way.
Qiongyuan Wu, Luca Mancino, Matteo Carlesso, Mario A. Ciampini, Lorenzo Magrini, Nikolai Kiesel, and Mauro Paternostro
PRX Quantum 3, 010322 (2022) - Published 8 February, 2022
Dynamics of a levitated nanoparticle, transitioning from harmonic to double-well potential, is studied from the viewpoint of quantum thermodynamics.
Matteo Carrega, Loris Maria Cangemi, Giulio De Filippis, Vittorio Cataudella, Giuliano Benenti, and Maura Sassetti
PRX Quantum 3, 010323 (2022) - Published 9 February, 2022
An open quantum system, where system-environment couplings are periodically modulated, is studied, and formalism is developed to apply optimal control and machine learning techniques to quantum thermal machines.
Enrico Rinaldi, Xizhi Han, Mohammad Hassan, Yuan Feng, Franco Nori, Michael McGuigan, and Masanori Hanada
PRX Quantum 3, 010324 (2022) - Published 10 February, 2022
Machine learning and quantum algorithms can help in solving matrix models, learning about quantum gravity, and the role played by entanglement.
Paul Boes, Nelly H.Y. Ng, and Henrik Wilming
PRX Quantum 3, 010325 (2022) - Published 14 February, 2022
Surprises on the variance of surprisal: it tells us more about the single-shot setting than previously expected.
Pablo Terrén Alonso, Paolo Abiuso, Martí Perarnau-Llobet, and Liliana Arrachea
PRX Quantum 3, 010326 (2022) - Published 16 February, 2022
A geometric approach to quantum thermal machines is exploited to find optimal cycles for heat-work conversion with minimal dissipation.
Tathagata Karmakar, Philippe Lewalle, and Andrew N. Jordan
PRX Quantum 3, 010327 (2022) - Published 18 February, 2022
The statistics of the monitored quantum state dynamics are analyzed enabling characterization of a quantum system undergoing continuous measurement.
Lin Xin, M.S. Chapman, and T.A.B. Kennedy
PRX Quantum 3, 010328 (2022) - Published 22 February, 2022
A method to rapidly prepare a spin-nematic squeezed eigenstate via double-quench of the Hamiltonian is presented, enabling a significant reduction in state preparation time.
Christopher Chamberland, Kyungjoo Noh, Patricio Arrangoiz-Arriola, Earl T. Campbell, Connor T. Hann, Joseph Iverson, Harald Putterman, Thomas C. Bohdanowicz, Steven T. Flammia, Andrew Keller, Gil Refael, John Preskill, Liang Jiang, Amir H. Safavi-Naeini, Oskar Painter, and Fernando G.S.L. Brandão
PRX Quantum 3, 010329 (2022) - Published 23 February, 2022
An architectural analysis for a fault-tolerant quantum computer is thoroughly presented: With 1,000 superconducting circuit components, problems currently intractable for classical computers could be solved.
Dmitry Budker, Peter W. Graham, Harikrishnan Ramani, Ferdinand Schmidt-Kaler, Christian Smorra, and Stefan Ulmer
PRX Quantum 3, 010330 (2022) - Published 24 February, 2022
Recent advances in the trapping and manipulation of ions, protons, antiprotons, and electrons can lead to increased sensitivity for detecting an important dark matter candidate.
Christopher Chamberland and Earl T. Campbell
PRX Quantum 3, 010331 (2022) - Published 25 February, 2022
A lattice surgery protocol is introduced to optimize quantum computing, helping to eliminate extra circuit components and gate scheduling complexities, or reduce runtimes and the total space-time costs.
Frédéric Bouchard, Duncan England, Philip J. Bustard, Khabat Heshami, and Benjamin Sussman
PRX Quantum 3, 010332 (2022) - Published 28 February, 2022
A new protocol, based on ultrafast optical switching is demonstrated, achieving picosecond time separation for enhanced stability and increased operational bandwidth in quantum key distribution.
Alexander M. Dalzell, Nicholas Hunter-Jones, and Fernando G. S. L. Brandão
PRX Quantum 3, 010333 (2022) - Published 1 March, 2022
Anti-concentration, a property related to the difficulty of classically simulating a quantum circuit, is shown to happen much faster than previously believed.
M. Cetina, L.N. Egan, C. Noel, M.L. Goldman, D. Biswas, A.R. Risinger, D. Zhu, and C. Monroe
PRX Quantum 3, 010334 (2022) - Published 2 March, 2022
The heating of axial modes of motion is identified as a source of error for quantum gates on long chains of trapped ions, but sympathetic cooling is shown to circumvent the issue.
Baptiste Royer, Shraddha Singh, and S.M. Girvin
PRX Quantum 3, 010335 (2022) - Published 7 March, 2022
A new multimode error-correcting code promises exceptional capabilities: A paper with plenty of new theoretical insights, plus guidance to experimentalists.
M. Bello, G. Platero, and A. González-Tudela
PRX Quantum 3, 010336 (2022) - Published 7 March, 2022
An extensive analysis of numerous many-body phases reachable in a topological waveguide QED quantum simulator is presented.
Kun Fang and Zi-Wen Liu
PRX Quantum 3, 010337 (2022) - Published 8 March, 2022
A universal and powerful method for analyzing the fundamental limitations on quantum resource purification is presented, enabling a robust no-purification theory for dynamical quantum resources and wide-ranging applications for practical quantum information processing
D. C. Gold, P. Huft, C. Young, A. Safari, T. G. Walker, M. Saffman, and D. D. Yavuz
PRX Quantum 3, 010338 (2022) - Published 9 March, 2022
An optically thin and ultracold medium, devoid of feedback, is shown to produce spatially coherent light, deepening our understanding of collective radiative effects.
Benchen Huang, Marco Govoni, and Giulia Galli
PRX Quantum 3, 010339 (2022) - Published 10 March, 2022
A defect embedded in a periodic array of a tractable number of atoms is studied, revealing the effects of hardware noise and ways to mitigate its effects.
Xiao-Dong Yu, Timo Simnacher, H. Chau Nguyen, and Otfried Gühne
PRX Quantum 3, 010340 (2022) - Published 11 March, 2022
A provable approach to simplify rank-constrained optimization problems is presented, leading to an efficient algorithm that can outperform current techniques significantly.
Cosmo Lupo and Yingkai Ouyang
PRX Quantum 3, 010341 (2022) - Published 14 March, 2022
Security proofs that incorporate physical constraints of realistic heterodyne detectors are presented, establishing a rigorous analysis of collective attacks in a continuous-variable quantum cryptography scheme.
Irénée Frérot, Flavio Baccari, and Antonio Acín
PRX Quantum 3, 010342 (2022) - Published 15 March, 2022
A scheme is presented to probe multipartite entanglement in many-body systems in a scalable, certified, and systematic manner, providing a needed tool for experiments in a quantum advantage regime.
I. Lekavicius, R.L. Myers-Ward, D.J. Pennachio, J.R. Hajzus, D.K. Gaskill, A.P. Purdy, A.L. Yeats, P.G. Brereton, E.R. Glaser, T.L. Reinecke, and S.G. Carter
PRX Quantum 3, 010343 (2022) - Published 16 March, 2022
A significant improvement in retaining optimal spin coherence properties is shown in an ensemble with high defect concentrations, which is important in numerous fields of quantum technology.
Joshua Ramette, Josiah Sinclair, Zachary Vendeiro, Alyssa Rudelis, Marko Cetina, and Vladan Vuletić
PRX Quantum 3, 010344 (2022) - Published 17 March, 2022
Full connectivity across many trapped ion and Rydberg modules is possible in a new quantum processor architecture that exploits optical cavities and heralded single photons.
Yasunari Suzuki, Suguru Endo, Keisuke Fujii, and Yuuki Tokunaga
PRX Quantum 3, 010345 (2022) - Published 18 March, 2022
A computational architecture where quantum error mitigation and correction contribute equally is proposed, leading to a scheme that can dramatically alleviate computational overheads and hasten the arrival of the fault-tolerant era.
Keisuke Fujii, Kaoru Mizuta, Hiroshi Ueda, Kosuke Mitarai, Wataru Mizukami, and Yuya O. Nakagawa
PRX Quantum 3, 010346 (2022) - Published 21 March, 2022
A variational quantum eigensolver method that extends the power of NISQ devices is proposed: It solves a target large-scale quantum system by dividing the problem into several smaller subsystems.
Tom Manovitz, Yotam Shapira, Lior Gazit, Nitzan Akerman, and Roee Ozeri
PRX Quantum 3, 010347 (2022) - Published 22 March, 2022
A scalable route to larger trapped-ions quantum processors is demonstrated: A blueprint for realizing robust entangling gates and real time quantum coherent feedback using a CCD camera.
Ryuji Takagi, Bartosz Regula, and Mark M. Wilde
PRX Quantum 3, 010348 (2022) - Published 23 March, 2022
The relation between the one-shot distillable resource yield and dilution cost is investigated, establishing a fundamental bound that captures the transformation errors involved in these processes.
Cillian Harney and Stefano Pirandola
PRX Quantum 3, 010349 (2022) - Published 25 March, 2022
Analytical results for the performance of large scale quantum networks are provided, establishing conditions for optimal end-to-end rates and the advantage of satellite-based quantum repeaters.
L. Howe, M. A. Castellanos-Beltran, A. J. Sirois, D. Olaya, J. Biesecker, P. D. Dresselhaus, S. P. Benz, and P. F. Hopkins
PRX Quantum 3, 010350 (2022) - Published 25 March, 2022
An important engineering step for the scaling of quantum computers based on superconducting qubits is achieved: Josephson junction-based qubit control electronics are demonstrated at 3 K.
Karthik Chinni, Manuel H. Muñoz-Arias, Ivan H. Deutsch, and Pablo M. Poggi
PRX Quantum 3, 010351 (2022) - Published 28 March, 2022
Even small Trotter step sizes can lead to significant errors in the quantum simulation of spin systems, revealing a crucial interplay between physical properties of the simulated Hamiltonian and the Trotterized evolution.
Jacob Z. Blumoff, Andrew S. Pan, Tyler E. Keating, Reed W. Andrews, David W. Barnes, Teresa L. Brecht, Edward T. Croke, Larken E. Euliss, Jacob A. Fast, Clayton A.C. Jackson, Aaron M. Jones, Joseph Kerckhoff, Robert K. Lanza, Kate Raach, Bryan J. Thomas, Roland Velunta, Aaron J. Weinstein, Thaddeus D. Ladd, Kevin Eng, Matthew G. Borselli, Andrew T. Hunter, and Matthew T. Rakher
PRX Quantum 3, 010352 (2022) - Published 29 March, 2022
Combined measurement and initialization with high fidelity in exchange-only Si spin qubits is demonstrated.
Tyler D. Ellison, Yu-An Chen, Arpit Dua, Wilbur Shirley, Nathanan Tantivasadakarn, and Dominic J. Williamson
PRX Quantum 3, 010353 (2022) - Published 30 March, 2022
An important class of topological quantum error correcting codes is investigated, and a construction is given to capture a large family of exotic topological phases of matter.
Theodoros Ilias, Dayou Yang, Susana F. Huelga, and Martin B. Plenio
PRX Quantum 3, 010354 (2022) - Published 31 March, 2022
A new sensing framework is established, harnessing dissipative criticality of open quantum sensors and continuous measurement of the emitted radiation quanta, that promises Heisenberg-limited precision scaling.
Julian Münzberg, Christoph Dittel, Maxime Lebugle, Andreas Buchleitner, Alexander Szameit, Gregor Weihs, and Robert Keil
PRX Quantum 3, 010901 (2022) - Published 21 January, 2022
D. Carney, H. Müller, and J.M. Taylor
PRX Quantum 3, 010902 (2022) - Published 11 February, 2022