| Volume 4, Issue 2 April - June 2023 | | Advertisement PRX Quantum achieves a 9.7 Journal Impact Factor Score | According to the 2022 Journal Citation Reports (Clarivate Analytics, 2022), PRX Quantum achieved a 9.7 Journal Impact Factor Score. | | | | | | Not an APS member? Join today to start connecting with a community of more than 50,000 physicists. | | | | Perspective Alexander O. Sushkov PRX Quantum 4, 020101 (2023) – Published 22 May 2023  | In the quest for solving the dark-matter puzzle, quantum engineering strategies for improving detection sensitivity are discussed. | | | | | | Daniel Malz and J. Ignacio Cirac PRX Quantum 4, 020301 (2023) – Published 3 April 2023  | A proposal based on state-of-the-art quantum simulators shows how to explore long-range interactions so that central phenomena of quantum chemistry can be qualitatively investigated. | | | | | | Y. Jiang, E.P. Ruddy, K.O. Quinlan, M. Malnou, N.E. Frattini, and K.W. Lehnert PRX Quantum 4, 020302 (2023) – Published 6 April 2023  | A quantum-enhanced sensing technique based on two cavities coupled via a Josephson ring modulator is developed to substantially accelerate a detection scan rate, ultimately boosting significantly the search of axions. | | | | | | Héctor Bombín, Chris Dawson, Ryan V. Mishmash, Naomi Nickerson, Fernando Pastawski, and Sam Roberts PRX Quantum 4, 020303 (2023) – Published 7 April 2023  | A comprehensive and platform-independent framework for universal fault-tolerant logic is presented, enabling mapping from an abstract description of the logical gate to a precise set of physical instructions. | | | | | | Thomas Ayral, Thibaud Louvet, Yiqing Zhou, Cyprien Lambert, E. Miles Stoudenmire, and Xavier Waintal PRX Quantum 4, 020304 (2023) – Published 10 April 2023  | An algorithm to simulate NISQ quantum circuits that uses iteratively compressed tensor networks leads to impressive capabilities and rivals experimental demonstrations of "quantum supremacy." | | | | | | Veit Langrock, Jan A. Krzywda, Niels Focke, Inga Seidler, Lars R. Schreiber, and Łukasz Cywiński PRX Quantum 4, 020305 (2023) – Published 11 April 2023  | Protocols for connecting qubits based on electrons in silicon quantum dots are proposed, highlighting opportunities and challenges for the implementation of coherent electron shuttling. | | | | | | Laura Serino, Jano Gil-Lopez, Michael Stefszky, Raimund Ricken, Christof Eigner, Benjamin Brecht, and Christine Silberhorn PRX Quantum 4, 020306 (2023) – Published 12 April 2023  | A new method to decode high-dimensional information imprinted on temporal modes is introduced and experimentally demonstrated. | | | | | | Nicholas Anto-Sztrikacs, Ahsan Nazir, and Dvira Segal PRX Quantum 4, 020307 (2023) – Published 13 April 2023  | A new technique for open quantum dynamics, combining reaction coordinate mappings and the polaron transform, allows for efficient description of strong system-bath couplings, opening the way for novel applications in nanoscale transport and thermodynamics. | | | | | | Daniel B. Higginbottom, Faezeh Kimiaee Asadi, Camille Chartrand, Jia-Wei Ji, Laurent Bergeron, Michael L.W. Thewalt, Christoph Simon, and Stephanie Simmons PRX Quantum 4, 020308 (2023) – Published 17 April 2023  | Proof-of-principle measurements inform quantum memory and transduction protocols for T center ensembles. | | | | | | Cyril Elouard and Camille Lombard Latune PRX Quantum 4, 020309 (2023) – Published 18 April 2023  | Energy exchanges between arbitrary quantum systems are shown to obey thermodynamic laws, opening the way for the characterization of autonomous thermal devices at the microscale fueled by quantum, nonideal energy sources. | | | | | | I.A. Aloisio, G.A.L. White, C.D. Hill, and K. Modi PRX Quantum 4, 020310 (2023) – Published 19 April 2023  | The investigation of open quantum systems from a complexity-theoretic perspective is possible under the lens of a multitime sampling problem. | | | | | | Pedro Lauand, Davide Poderini, Ranieri Nery, George Moreno, Lucas Pollyceno, Rafael Rabelo, and Rafael Chaves PRX Quantum 4, 020311 (2023) – Published 20 April 2023  | A new scenario for three observable causal structures is analyzed, going beyond Bell's model and providing novel insights into whether nonclassical correlations can arise from it. | | | | | | Joachim Cohen, Alexandru Petrescu, Ross Shillito, and Alexandre Blais PRX Quantum 4, 020312 (2023) – Published 21 April 2023  | Dispersive readout of a transmon's computational states is strongly impacted by unaccounted chaotic dynamics that are often present under regular experimental conditions. | | | | | | Renke Huang, Chenyang Li, and Francesco A. Evangelista PRX Quantum 4, 020313 (2023) – Published 24 April 2023  | A quantum unitary downfolding formalism that works on noisy and fault-tolerant hardware is proposed and tested on several challenging chemical problems, offering a viable approach for estimating molecular properties with chemical accuracy. | | | | | | Manuel H. Muñoz-Arias, Ivan H. Deutsch, and Pablo M. Poggi PRX Quantum 4, 020314 (2023) – Published 25 April 2023  | A unified description is presented that allows the optimal state preparation of collective spin systems for quantum metrology based on the spins' semiclassical dynamics. | | | | | | Kevin C. Smith, Eleanor Crane, Nathan Wiebe, and S.M. Girvin PRX Quantum 4, 020315 (2023) – Published 26 April 2023  | A class of symmetry-protected topological states relevant for measurement-based quantum computation is shown to be constructible using only constant-depth quantum circuits by leveraging symmetries, midcircuit measurements, and feed forward. | | | | | | Kangheun Kim and Jaewook Ahn PRX Quantum 4, 020316 (2023) – Published 27 April 2023  | A quantum state tomography method with continuously tunable measurement operators is experimentally explored, showing reliable high-fidelity full quantum state reconstruction of Rydberg atom arrays. | | | | | | Editors' Suggestion Dominik Kiesenhofer, Helene Hainzer, Artem Zhdanov, Philip C. Holz, Matthias Bock, Tuomas Ollikainen, and Christian F. Roos PRX Quantum 4, 020317 (2023) – Published 28 April 2023  | Stationary, 2D ion crystals of more than 100 ions are carefully characterized and cooled to near the ground state, paving the way for new quantum simulations with long-range interactions. | | | | | | Florian Kranzl, Aleksander Lasek, Manoj K. Joshi, Amir Kalev, Rainer Blatt, Christian F. Roos, and Nicole Yunger Halpern PRX Quantum 4, 020318 (2023) – Published 28 April 2023  | Thermodynamics of noncommuting charges is experimentally probed using a trapped-ion simulator, demonstrating the thermalization of a many-body system to a non-Abelian thermal state. | | | | | | Jeffrey M. Gertler, Sean van Geldern, Shruti Shirol, Liang Jiang, and Chen Wang PRX Quantum 4, 020319 (2023) – Published 2 May 2023  | The tools to prepare and characterize multimode bosonic states is expanded, allowing the experimental demonstration of pair-coherent states on superconducting cavities—a step closer to the pair-cat code. | | | | | | Lara Stroh, Nikola Horová, Robert Stárek, Ittoop V. Puthoor, Michal Mičuda, Miloslav Dušek, and Erika Andersson PRX Quantum 4, 020320 (2023) – Published 4 May 2023  | An xᴏʀ oblivious transfer protocol for quantum communication is characterized in detail, including determining all cheating probabilities and a proof-of-principle experimental implementation. | | | | | | Armands Strikis and Lucas Berent PRX Quantum 4, 020321 (2023) – Published 5 May 2023  | A recipe on how to construct quantum error-correcting codes that are tailored to the connectivity constraints of modular architectures is presented. | | | | | | Meng-Zi Huang, Jose Alberto de la Paz, Tommaso Mazzoni, Konstantin Ott, Peter Rosenbusch, Alice Sinatra, Carlos L. Garrido Alzar, and Jakob Reichel PRX Quantum 4, 020322 (2023) – Published 8 May 2023  | The time evolution of spin-squeezed hyperfine clock states is observed on previously inaccessible timescales, opening a pathway to entanglement-enhanced atomic clocks. | | | | | | Guang Hao Low, Yuan Su, Yu Tong, and Minh C. Tran PRX Quantum 4, 020323 (2023) – Published 9 May 2023  | Structured Trotter steps enable faster quantum simulation. | | | | | | Shuheng Liu, Qiongyi He, Marcus Huber, Otfried Gühne, and Giuseppe Vitagliano PRX Quantum 4, 020324 (2023) – Published 10 May 2023  | The dimensionality of entanglement is probed using properties of the correlation matrix in randomized measurements, a method that works without a common reference frame and with arbitrary dimensionality. | | | | | | Nikolai Wyderka and Andreas Ketterer PRX Quantum 4, 020325 (2023) – Published 10 May 2023  | Novel insights are obtained on randomized measurements, providing a connection between the geometry of correlation matrices and informationally complete measurements. | | | | | | Ronen M. Kroeze, Brendan P. Marsh, Kuan-Yu Lin, Jonathan Keeling, and Benjamin L. Lev PRX Quantum 4, 020326 (2023) – Published 11 May 2023  | A new cavity QED setup displays both high-cooperativity and high-resolution intracavity imaging thanks to multimode superposition. | | | | | | Han Zheng, Zimu Li, Junyu Liu, Sergii Strelchuk, and Risi Kondor PRX Quantum 4, 020327 (2023) – Published 15 May 2023  | A framework to design non-Abelian group-equivariant quantum variational Ansätze as an example of extended permutational quantum computation is introduced. | | | | | | Thomas J. Bell, Love A. Pettersson, and Stefano Paesani PRX Quantum 4, 020328 (2023) – Published 17 May 2023  | Tools to analyze the loss and error tolerance in general graph codes are developed and used to build optimization techniques, boosting the capabilities of photonic quantum technologies. | | | | | | Bo-Ye Sun, Nathan Goldman, Monika Aidelsburger, and Marin Bukov PRX Quantum 4, 020329 (2023) – Published 19 May 2023  | A proposal suggests that non-Abelian chiral spin liquids can be realized and probed in quantum simulators using Floquet engineering. | | | | | | Federica Maria Surace, Pierre Fromholz, Nelson Darkwah Oppong, Marcello Dalmonte, and Monika Aidelsburger PRX Quantum 4, 020330 (2023) – Published 24 May 2023  | A novel scheme for a scalable implementation of U(1) lattice gauge theories coupled to matter in one and two dimensions using alkaline-earth atoms in state-dependent optical lattices. | | | | | | Zhiyan Ding and Lin Lin PRX Quantum 4, 020331 (2023) – Published 26 May 2023  | An algorithm for performing phase-estimation tasks on early fault-tolerant quantum computers promises to reduce circuit depth by nearly 2 orders of magnitude. | | | | | | Oscar Higgott and Nikolas P. Breuckmann PRX Quantum 4, 020332 (2023) – Published 30 May 2023  | The single-shot performance of higher-dimensional hypergraph product codes is studied, revealing strategies that greatly exceed all previously reported thresholds. | | | | | | Raphael Kaubruegger, Athreya Shankar, Denis V. Vasilyev, and Peter Zoller PRX Quantum 4, 020333 (2023) – Published 1 June 2023  | A novel approach to determining fundamental precision limits for multiparameter metrology; concrete implementations on programmable quantum sensors that approach these fundamental limits are shown. | | | | | | Arthur J. Parzygnat and James Fullwood PRX Quantum 4, 020334 (2023) – Published 2 June 2023  | Bayes' rule, one of the foundational results in probability theory, is rigorously extended to the quantum domain through the notion of time-reversal symmetry. | | | | | | Charles Fromonteil, Dolev Bluvstein, and Hannes Pichler PRX Quantum 4, 020335 (2023) – Published 5 June 2023  | Novel and experimentally appealing protocols for realizing multiqubit entangling gates using neutral-atom qubits are introduced. | | | | | | Sven Jandura, Jeff D. Thompson, and Guido Pupillo PRX Quantum 4, 020336 (2023) – Published 5 June 2023  | A family of Rydberg blockade gates for neutral-atom qubits is presented, showing how one can significantly reduce the requirements on laser stability and atomic temperature to achieve fault-tolerant quantum computing. | | | | | | Luca Gravina, Fabrizio Minganti, and Vincenzo Savona PRX Quantum 4, 020337 (2023) – Published 7 June 2023  | A bosonic code is proposed that makes use of both two-photon loss and Kerr nonlinearity, offering an enhanced performance over a broad range of detuning values and resistance to the random frequency shifts arising in multiple-qubit operations. | | | | | | Eric R. Anschuetz, Hong-Ye Hu, Jin-Long Huang, and Xun Gao PRX Quantum 4, 020338 (2023) – Published 8 June 2023  | Quantum contextuality is linked to the expressive power of quantum neural networks and used in a novel strategy for designing quantum machine-learning models. | | | | | | Nathanan Tantivasadakarn, Ashvin Vishwanath, and Ruben Verresen PRX Quantum 4, 020339 (2023) – Published 9 June 2023  | Using measurement as a resource gives a new picture of the landscape of long-range entangled states, with several practical implications for quantum simulators. | | | | | | Dominik S. Wild and Álvaro M. Alhambra PRX Quantum 4, 020340 (2023) – Published 12 June 2023  | A new algorithm reduces the resources needed to simulate the dynamics of a quantum system on a classical computer. | | | | | | Margarita Davydova, Nathanan Tantivasadakarn, and Shankar Balasubramanian PRX Quantum 4, 020341 (2023) – Published 13 June 2023  | A new class of error-correcting dynamic codes in two and three dimensions that has no explicit connection to any parent subsystem code is developed. | | | | | | Yijia Xu, Yixu Wang, En-Jui Kuo, and Victor V. Albert PRX Quantum 4, 020342 (2023) – Published 14 June 2023  | The strategy of concatenating Gottesman-Kitaev-Preskill with qubit error-correcting codes is investigated, providing insights on the advantages over established schemes and on how to build efficient decoders. | | | | | | Maxwell Aifer, Nathan M. Myers, and Sebastian Deffner PRX Quantum 4, 020343 (2023) – Published 15 June 2023  | The second law of thermodynamics and Landauer's erasure principle are formulated for noisy optical polarizers, providing fundamental new advances on the thermodynamic description of quantum communication devices. | | | | | | L. Orr, Saeed A. Khan, N. Buchholz, S. Kotler, and A. Metelmann PRX Quantum 4, 020344 (2023) – Published 16 June 2023  | Continuous-variable entanglement of propagating modes can be made robust against thermal fluctuations by using a clever approach based on nonreciprocity; a method ideally suited for parametric circuit QED implementations. | | | | | | Zhenyu Cai, Adam Siegel, and Simon Benjamin PRX Quantum 4, 020345 (2023) – Published 16 June 2023  | A proposed pipelining architecture processes a stack of qubit arrays and implements an effective 3D qubit lattice on a physical 2D hardware substrate, allowing the realization of a variety of code structures with the cost of magic state distillation reduced by 2 orders of magnitude. | | | | | | G.A. Oakes, L. Peri, L. Cochrane, F. Martins, L. Hutin, B. Bertrand, M. Vinet, A. Gomez Saiz, C.J.B. Ford, C.G. Smith, and M.F. Gonzalez-Zalba PRX Quantum 4, 020346 (2023) – Published 20 June 2023  | A radio-frequency multiplier is implemented in a multigate silicon nanowire transistor at cryogenic temperatures, greatly alleviating the challenges associated with the delivery of high-frequency signals to semiconductor quantum processors. | | | | | | Yaroslav Herasymenko, Igor Gornyi, and Yuval Gefen PRX Quantum 4, 020347 (2023) – Published 21 June 2023  | A framework is proposed for creating many-body entangled states with generalized measurements, showing a significant improvement in performance. | | | | | | Zhiyuan Wang and Kaden R. A. Hazzard PRX Quantum 4, 020348 (2023) – Published 22 June 2023  | Novel mathematical techniques are developed and used to show that local perturbations have local effects in power-law interacting systems. | | | | | | Christopher L. Baldwin, Adam Ehrenberg, Andrew Y. Guo, and Alexey V. Gorshkov PRX Quantum 4, 020349 (2023) – Published 22 June 2023  | Tighter Lieb-Robinson bounds, including sub-ballistic light cones, are derived for one-dimensional disordered systems. | | | | | | C. Berdou, A. Murani, U. Réglade, W.C. Smith, M. Villiers, J. Palomo, M. Rosticher, A. Denis, P. Morfin, M. Delbecq, T. Kontos, N. Pankratova, F. Rautschke, T. Peronnin, L.-A. Sellem, P. Rouchon, A. Sarlette, M. Mirrahimi, P. Campagne-Ibarcq, S. Jezouin, R. Lescanne, and Z. Leghtas PRX Quantum 4, 020350 (2023) – Published 23 June 2023  | An experimental investigation of nonlinearly dissipative bistable dynamical systems shows macroscopic bit-flip times with mesoscopic photon numbers. | | | | | | Guanhao Huang, Nils J. Engelsen, Ofer Kfir, Claus Ropers, and Tobias J. Kippenberg PRX Quantum 4, 020351 (2023) – Published 26 June 2023  | A theoretical framework for quantum state engineering with free electrons coupled to photonic integrated circuits. | | | | | | Aw Clive Cenxin, Kelvin Onggadinata, Dagomir Kaszlikowski, and Valerio Scarani PRX Quantum 4, 020352 (2023) – Published 27 June 2023  | Bayes' theorem is extended to the domain of quasiprobabilities and informationally complete measurements using the Petz recovery map. | | | | | | Krzysztof Ptaszyński and Massimiliano Esposito PRX Quantum 4, 020353 (2023) – Published 27 June 2023  | The notion of irreversibility, which is partially due to the generation of correlations between degrees of freedom of system and environment, is split into quantum and classical contributions, which are found to behave very differently for fermions and bosons. | | | | | | Takahiro Tsunoda, James D. Teoh, William D. Kalfus, Stijn J. de Graaf, Benjamin J. Chapman, Jacob C. Curtis, Neel Thakur, Steven M. Girvin, and Robert J. Schoelkopf PRX Quantum 4, 020354 (2023) – Published 28 June 2023  | A new geometric framework to implement two-qubit gates between bosonic qubits is proposed, allowing one to reach gate fidelities at the 0.01% level with today's hardware after detecting for errors. | | | | | | Benjamin J. Chapman, Stijn J. de Graaf, Sophia H. Xue, Yaxing Zhang, James Teoh, Jacob C. Curtis, Takahiro Tsunoda, Alec Eickbusch, Alexander P. Read, Akshay Koottandavida, Shantanu O. Mundhada, Luigi Frunzio, M.H. Devoret, S.M. Girvin, and R.J. Schoelkopf PRX Quantum 4, 020355 (2023) – Published 28 June 2023  | A SNAIL-based coupler is used to devise a programmable beam splitter interaction between two bosonic modes with over an octave separation in frequency; the method is further applied as a primitive for constructing two-qubit bosonic gates. | | | | | | Ted Thorbeck, Andrew Eddins, Isaac Lauer, Douglas T. McClure, and Malcolm Carroll PRX Quantum 4, 020356 (2023) – Published 29 June 2023  | The effects of ionizing radiation on superconducting qubits are studied, showing that the two-level systems near a qubit can be "scrambled," resulting in long-lasting changes to the lifetime of the qubit. | | | | | | Laurens Lootens, Clement Delcamp, Gerardo Ortiz, and Frank Verstraete PRX Quantum 4, 020357 (2023) – Published 29 June 2023  | A constructive framework to duality transformations for any given one-dimensional quantum Hamiltonian is developed, enabling their classification by connecting module categories to different but equivalent representations of the Hamiltonian symmetries. | | | | | | Mingyu Kang, Wesley C. Campbell, and Kenneth R. Brown PRX Quantum 4, 020358 (2023) – Published 30 June 2023  | A proposed scheme converts physical noise on trapped-ion qubits into erasures, thereby significantly improving the performance of quantum error correction. | | | | | | Rhea Alexander, Si Gvirtz-Chen, Nikolaos Koukoulekidis, and David Jennings PRX Quantum 4, 020359 (2023) – Published 30 June 2023  | Quasiprobability representation of CSS circuits is used to obtain distillation bounds capable of outperforming previous results in regimes of practical interest. | | | | | | Yunzhe Zheng, Hemant Sharma, and Johannes Borregaard PRX Quantum 4, 020901 (2023) – Published 23 June 2023 | | | Christian W. Bauer et al. PRX Quantum 4, 027001 (2023) – Published 3 May 2023  | A detailed account on how quantum simulators and quantum computers can help explore the fundamental constituents of matter and energy, from the smallest to the largest structures in the Universe. | | | | | | | |
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