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On the Cover

High-fidelity two-qubit gates are achieved with heavy-fluxonium qubits, circuits that break many conventional superconducting circuit paradigms, bringing more diversity for quantum applications.

From the article:

Tunable Inductive Coupler for High-Fidelity Gates Between Fluxonium Qubits
Helin Zhang, Chunyang Ding, D.K. Weiss, Ziwen Huang, Yuwei Ma, Charles Guinn, Sara Sussman, Sai Pavan Chitta, Danyang Chen, Andrew A. Houck, Jens Koch, and David I. Schuster
PRX Quantum 5, 020326 (2024)

EDITORIALS AND ANNOUNCEMENTS

Editorial: Coauthor! Coauthor!

Randall D. Kamien and Daniel Ucko

PRX Quantum 5, 020001 (2024) - Published 21 May, 2024

HIGHLIGHTED ARTICLES

Multimode Ion-Photon Entanglement over 101 Kilometers

V. Krutyanskiy, M. Canteri, M. Meraner, V. Krcmarsky, and B.P. Lanyon

PRX Quantum 5, 020308 (2024) - Published 10 April, 2024

Multiplexing entanglement attempts across multiple qubits in a quantum network node increases the entanglement rate without reducing fidelity.

Experimental Speedup of Quantum Dynamics through Squeezing

S. C. Burd, H. M. Knaack, R. Srinivas, C. Arenz, A. L. Collopy, L. J. Stephenson, A. C. Wilson, D. J. Wineland, D. Leibfried, J. J. Bollinger, D. T. C. Allcock, and D. H. Slichter

PRX Quantum 5, 020314 (2024) - Published 17 April, 2024

An experimental demonstration shows that quantum squeezing can be used to amplify a Hamiltonian’s effect—even when the Hamiltonian is unknown.

Tunable Inductive Coupler for High-Fidelity Gates Between Fluxonium Qubits

Helin Zhang, Chunyang Ding, D.K. Weiss, Ziwen Huang, Yuwei Ma, Charles Guinn, Sara Sussman, Sai Pavan Chitta, Danyang Chen, Andrew A. Houck, Jens Koch, and David I. Schuster

PRX Quantum 5, 020326 (2024) - Published 2 May, 2024

High-fidelity two-qubit gates are achieved with heavy-fluxonium qubits, circuits that break many conventional superconducting circuit paradigms, bringing more diversity for quantum applications.

Enhanced Quantum Control of Individual Ultracold Molecules Using Optical Tweezer Arrays

Daniel K. Ruttley, Alexander Guttridge, Tom R. Hepworth, and Simon L. Cornish

PRX Quantum 5, 020333 (2024) - Published 13 May, 2024

Site-resolved control and detection of rotational states of molecules trapped in an array of optical tweezers is demonstrated, opening up applications in quantum metrology, simulation, and sensing.

Site-Selective Preparation and Multistate Readout of Molecules in Optical Tweezers

Lewis R. B. Picard, Gabriel E. Patenotte, Annie J. Park, Samuel F. Gebretsadkan, and Kang-Kuen Ni

PRX Quantum 5, 020344 (2024) - Published 28 May, 2024

Harnessing the multilevel structure and constituent atoms of polar molecules allows us to extend the state preparation and measurement capabilities for broad applicability in quantum information, simulation, and metrology.

Ultracold LiCr: A New Pathway to Quantum Gases of Paramagnetic Polar Molecules

S. Finelli, A. Ciamei, B. Restivo, M. Schemmer, A. Cosco, M. Inguscio, A. Trenkwalder, K. Zaremba-Kopczyk, M. Gronowski, M. Tomza, and M. Zaccanti

PRX Quantum 5, 020358 (2024) - Published 12 June, 2024

Production of ultracold lithium-chromium (LiCr) molecules and thorough characterization of their properties establishes LiCr as a prime candidate for the realization of quantum gases of doubly polar molecules.

PERSPECTIVES

Early Fault-Tolerant Quantum Computing

Amara Katabarwa, Katerina Gratsea, Athena Caesura, and Peter D. Johnson

PRX Quantum 5, 020101 (2024) - Published 17 June, 2024

As quantum computing transitions into the fault-tolerant regime, understanding how best to utilize available architectures becomes paramount.

TUTORIALS

Current Fluctuations in Open Quantum Systems: Bridging the Gap Between Quantum Continuous Measurements and Full Counting Statistics

Gabriel T. Landi, Michael J. Kewming, Mark T. Mitchison, and Patrick P. Potts

PRX Quantum 5, 020201 (2024) - Published 2 April, 2024

A pedagogical overview of analytical and numerical techniques used to characterize current fluctuations in Markovian systems is presented, helping to bridge knowledge between condensed-matter physics and quantum optics.

Quantum Master Equations: Tips and Tricks for Quantum Optics, Quantum Computing, and Beyond

Francesco Campaioli, Jared H. Cole, and Harini Hapuarachchi

PRX Quantum 5, 020202 (2024) - Published 10 June, 2024

A pedagogical hands-on guide to quantum master equations and their numerical implementations, tailored to newcomers interested in interdisciplinary research.

ARTICLES

Charge Sensing the Parity of an Andreev Molecule

David van Driel, Bart Roovers, Francesco Zatelli, Alberto Bordin, Guanzhong Wang, Nick van Loo, Jan Cornelis Wolff, Grzegorz P. Mazur, Sasa Gazibegovic, Ghada Badawy, Erik P.A.M. Bakkers, Leo P. Kouwenhoven, and Tom Dvir

PRX Quantum 5, 020301 (2024) - Published 1 April, 2024

A quantum-dot charge sensor is used to probe Andreev bound states and Andreev molecules, enabling one to resolve even and odd states based on charge, without affecting the parity.

Coherent Control of Bloch Oscillations in a Superconducting Circuit

Pengtao Song, Zhongcheng Xiang, Yu-Xiang Zhang, Zhan Wang, Xueyi Guo, Xinhui Ruan, Xiaohui Song, Kai Xu, Yvonne Y. Gao, Heng Fan, and Dongning Zheng

PRX Quantum 5, 020302 (2024) - Published 3 April, 2024

Coherent control of Bloch oscillations is achieved for a nine-qubit one-dimensional superconducting circuit, opening a route to modulate electron transport.

Quantum Control of Radical-Pair Dynamics beyond Time-Local Optimization

Farhan T. Chowdhury, Matt C.J. Denton, Daniel C. Bonser, and Daniel R. Kattnig

PRX Quantum 5, 020303 (2024) - Published 4 April, 2024

GRAPE, a ubiquitous quantum control technique, is extended to allow the suppressing or boosting of biochemical radical-pair reactions.

Learnability Transitions in Monitored Quantum Dynamics via Eavesdropper’s Classical Shadows

Matteo Ippoliti and Vedika Khemani

PRX Quantum 5, 020304 (2024) - Published 5 April, 2024

Measurement-induced phase transitions in quantum many-body systems are studied from the perspective of the classical detection record and the corresponding information transfer.

Engineering 3D Floquet Codes by Rewinding

Arpit Dua, Nathanan Tantivasadakarn, Joseph Sullivan, and Tyler D. Ellison

PRX Quantum 5, 020305 (2024) - Published 8 April, 2024

The interpretation of measurements as condensation and the idea of rewinding the measurement sequence are applied to Floquet codes, creating novel codes such as the three-dimensional Floquet toric code.

Dynamically Enhancing Qubit-Photon Interactions with Antisqueezing

M. Villiers, W.C. Smith, A. Petrescu, A. Borgognoni, M. Delbecq, A. Sarlette, M. Mirrahimi, P. Campagne-Ibarcq, T. Kontos, and Z. Leghtas

PRX Quantum 5, 020306 (2024) - Published 9 April, 2024

A superconducting circuit experiment reveals a twofold increase in qubit-photon interactions using antisqueezing, marking a pioneering step toward dynamically controlled quantum interactions.

Long-Lived Quantum Memory Enabling Atom-Photon Entanglement over 101 km of Telecom Fiber

Yiru Zhou, Pooja Malik, Florian Fertig, Matthias Bock, Tobias Bauer, Tim van Leent, Wei Zhang, Christoph Becher, and Harald Weinfurter

PRX Quantum 5, 020307 (2024) - Published 10 April, 2024

An improved qubit encoding extends the lifetime of the quantum memory, enabling the distribution of entanglement over a metropolitan-scale distance.

Multimode Ion-Photon Entanglement over 101 Kilometers

V. Krutyanskiy, M. Canteri, M. Meraner, V. Krcmarsky, and B.P. Lanyon

PRX Quantum 5, 020308 (2024) - Published 10 April, 2024

Multiplexing entanglement attempts across multiple qubits in a quantum network node increases the entanglement rate without reducing fidelity.

Symplectic Geometry and Circuit Quantization

Andrew Osborne, Trevyn Larson, Sarah Garcia Jones, Ray W. Simmonds, András Gyenis, and Andrew Lucas

PRX Quantum 5, 020309 (2024) - Published 11 April, 2024

An efficient algorithm for quantizing circuits is presented, allowing the exploration of new situations where standard methods based on a Lagrangian description fail.

Lifting Topological Codes: Three-Dimensional Subsystem Codes from Two-Dimensional Anyon Models

Jacob C. Bridgeman, Aleksander Kubica, and Michael Vasmer

PRX Quantum 5, 020310 (2024) - Published 12 April, 2024

A novel class of quantum error-correcting codes, dubbed subsystem Abelian quantum double codes, is introduced and is used to better understand the single-shot property of topological codes.

Quantum Simulation of Bound State Scattering

Matteo Turco, Gonçalo Quinta, João Seixas, and Yasser Omar

PRX Quantum 5, 020311 (2024) - Published 15 April, 2024

A new, general protocol to simulate bound-state scattering with a quantum algorithm that directly excites wave packets in the interacting theory.

Quantum Random Access Memory Architectures Using 3D Superconducting Cavities

D.K. Weiss, Shruti Puri, and S.M. Girvin

PRX Quantum 5, 020312 (2024) - Published 16 April, 2024

New quantum random-access memory architectures based on high-coherence superconducting cavities allow suppression of the detrimental effects of noise.

Equilibrium Dynamics of Infinite-Range Quantum Spin Glasses in a Field

Maria Tikhanovskaya, Subir Sachdev, and Rhine Samajdar

PRX Quantum 5, 020313 (2024) - Published 17 April, 2024

The complete solution of the equilibrium properties of an Ising model with all-to-all and random interactions between qubits in the presence of a field in multiple directions is obtained.

Experimental Speedup of Quantum Dynamics through Squeezing

S. C. Burd, H. M. Knaack, R. Srinivas, C. Arenz, A. L. Collopy, L. J. Stephenson, A. C. Wilson, D. J. Wineland, D. Leibfried, J. J. Bollinger, D. T. C. Allcock, and D. H. Slichter

PRX Quantum 5, 020314 (2024) - Published 17 April, 2024

An experimental demonstration shows that quantum squeezing can be used to amplify a Hamiltonian’s effect—even when the Hamiltonian is unknown.

Scalable Circuits for Preparing Ground States on Digital Quantum Computers: The Schwinger Model Vacuum on 100 Qubits

Roland C. Farrell, Marc Illa, Anthony N. Ciavarella, and Martin J. Savage

PRX Quantum 5, 020315 (2024) - Published 18 April, 2024

A new scalable algorithm for efficiently preparing ground states of gapped theories is demonstrated in the Schwinger model on 100 qubits.

A Strontium Quantum-Gas Microscope

Sandra Buob, Jonatan Höschele, Vasiliy Makhalov, Antonio Rubio-Abadal, and Leticia Tarruell

PRX Quantum 5, 020316 (2024) - Published 18 April, 2024

A novel experimental realization of a strontium quantum-gas microscope allows site-resolved imaging of a Bose-Hubbard superfluid in an optical lattice.

Classically Computing Performance Bounds on Depolarized Quantum Circuits

Sattwik Deb Mishra, Miguel Frías-Pérez, and Rahul Trivedi

PRX Quantum 5, 020317 (2024) - Published 19 April, 2024

A method that makes use of ideas from convex optimization is proposed for efficiently computing rigorous bounds on the performance of noisy quantum circuits.

Bounding the Joint Numerical Range of Pauli Strings by Graph Parameters

Zhen-Peng Xu, René Schwonnek, and Andreas Winter

PRX Quantum 5, 020318 (2024) - Published 22 April, 2024

Graph-theoretic tools are used to obtain rigorous lower bounds on the ground-state energy of quantum many-body Hamiltonians made up of Pauli strings.

Scalable Entanglement Certification via Quantum Communication

Pharnam Bakhshinezhad, Mohammad Mehboudi, Carles Roch i Carceller, and Armin Tavakoli

PRX Quantum 5, 020319 (2024) - Published 23 April, 2024

Novel results show that there are entanglement advantages even in protocols involving only two-party product measurements, opening the way to new entanglement certification schemes.

High-Field Optical Cesium Magnetometer for Magnetic Resonance Imaging

Hans Stærkind, Kasper Jensen, Jörg H. Müller, Vincent O. Boer, Eugene S. Polzik, and Esben T. Petersen

PRX Quantum 5, 020320 (2024) - Published 24 April, 2024

A competitive technique for measuring magnetic fields of several teslas is proposed, and applications in medical MRI are demonstrated.

On-Demand Driven Dissipation for Cavity Reset and Cooling

Vivek Maurya, Haimeng Zhang, Daria Kowsari, Andre Kuo, Darian M. Hartsell, Clark Miyamoto, Jocelyn Liu, Sadman Shanto, Evangelos Vlachos, Azarin Zarassi, Kater W. Murch, and Eli M. Levenson-Falk

PRX Quantum 5, 020321 (2024) - Published 25 April, 2024

An active, on-demand dissipation device provides faster readout resonator reset and improved transmon coherence, creating a modular tool for entropy removal in circuit QED.

Quantum Field Theory for Multipolar Composite Bosons with Mass Defect and Relativistic Corrections

Tobias Asano, Enno Giese, and Fabio Di Pumpo

PRX Quantum 5, 020322 (2024) - Published 26 April, 2024

An effective quantum field theory for composite bosons is proposed that could facilitate modeling higher precision clocks and matter-wave interferometers including relativistic effects.

Inelastic Decay from Integrability

Amir Burshtein and Moshe Goldstein

PRX Quantum 5, 020323 (2024) - Published 29 April, 2024

In integrable quantum impurity models, inelastic photon scattering builds up from purely elastic scattering of quasiparticles, illuminating an elusive quantum phase transition.

Qubit-Efficient Randomized Quantum Algorithms for Linear Algebra

Samson Wang, Sam McArdle, and Mario Berta

PRX Quantum 5, 020324 (2024) - Published 30 April, 2024

A framework for constructing qubit-efficient algorithms that sample properties of matrix functions is developed, with a concrete application for calculating Green’s functions of quantum many-body systems.

Entangling Interactions Between Artificial Atoms Mediated by a Multimode Left-Handed Superconducting Ring Resonator

T. McBroom-Carroll, A. Schlabes, X. Xu, J. Ku, B. Cole, S. Indrajeet, M. D. LaHaye, M. H. Ansari, and B. L. T. Plourde

PRX Quantum 5, 020325 (2024) - Published 1 May, 2024

Enhanced control over qubit interactions is achieved using a ring resonator, with a left-handed dispersion relation and a dense mode structure, as a coupling bus for qubits.

Tunable Inductive Coupler for High-Fidelity Gates Between Fluxonium Qubits

Helin Zhang, Chunyang Ding, D.K. Weiss, Ziwen Huang, Yuwei Ma, Charles Guinn, Sara Sussman, Sai Pavan Chitta, Danyang Chen, Andrew A. Houck, Jens Koch, and David I. Schuster

PRX Quantum 5, 020326 (2024) - Published 2 May, 2024

High-fidelity two-qubit gates are achieved with heavy-fluxonium qubits, circuits that break many conventional superconducting circuit paradigms, bringing more diversity for quantum applications.

Quantum-Informed Recursive Optimization Algorithms

Jernej Rudi Finžgar, Aron Kerschbaumer, Martin J.A. Schuetz, Christian B. Mendl, and Helmut G. Katzgraber

PRX Quantum 5, 020327 (2024) - Published 3 May, 2024

A new study introduces quantum-informed recursive optimization algorithms, leveraging quantum resources for classical reductions in combinatorial optimization and demonstrating effectiveness on neutral-atom quantum processors.

Theory for Equivariant Quantum Neural Networks

Quynh T. Nguyen, Louis Schatzki, Paolo Braccia, Michael Ragone, Patrick J. Coles, Frédéric Sauvage, Martín Larocca, and M. Cerezo

PRX Quantum 5, 020328 (2024) - Published 6 May, 2024

Group-equivariant quantum neural networks utilize symmetries to alleviate central challenges in trainability and generalization in quantum neural-network architectures.

Universal Approach for Quantum Interfaces with Atomic Arrays

Yakov Solomons, Roni Ben-Maimon, and Ephraim Shahmoon

PRX Quantum 5, 020329 (2024) - Published 7 May, 2024

A new theoretical framework to account for collective quantum optical effects in the scattering of photons by atomic arrays.

High-Order Randomized Compiler for Hamiltonian Simulation

Kouhei Nakaji, Mohsen Bagherimehrab, and Alán Aspuru-Guzik

PRX Quantum 5, 020330 (2024) - Published 8 May, 2024

An algorithm, based on randomized compilation of the Hamiltonian terms, for high-precision quantum simulations is introduced.

The Classical-Quantum Limit

Isaac Layton and Jonathan Oppenheim

PRX Quantum 5, 020331 (2024) - Published 9 May, 2024

New theoretical work demonstrates how consistent models of effective classical-quantum dynamics emerge in a limit of quantum theory.

Simulating Open Quantum Systems Using Hamiltonian Simulations

Zhiyan Ding, Xiantao Li, and Lin Lin

PRX Quantum 5, 020332 (2024) - Published 10 May, 2024

A novel quantum algorithm, which exploits the relation between the Lindblad master equation, stochastic differential equations, and Hamiltonian simulations, is proposed to simulate open quantum systems on a quantum computer.

Enhanced Quantum Control of Individual Ultracold Molecules Using Optical Tweezer Arrays

Daniel K. Ruttley, Alexander Guttridge, Tom R. Hepworth, and Simon L. Cornish

PRX Quantum 5, 020333 (2024) - Published 13 May, 2024

Site-resolved control and detection of rotational states of molecules trapped in an array of optical tweezers is demonstrated, opening up applications in quantum metrology, simulation, and sensing.

Sensing Coherent Nuclear Spin Dynamics with an Ensemble of Paramagnetic Nitrogen Spins

R.M. Goldblatt, A.M. Martin, and A.A. Wood

PRX Quantum 5, 020334 (2024) - Published 14 May, 2024

Nitrogen-vacancy centers in diamond can be used to access the state of optically dark paramagnetic nitrogen defects, which in turn can be used as quantum sensors to extract information about their local environment.

Quantum Dichotomies and Coherent Thermodynamics beyond First-Order Asymptotics

Patryk Lipka-Bartosik, Christopher T. Chubb, Joseph M. Renes, Marco Tomamichel, and Kamil Korzekwa

PRX Quantum 5, 020335 (2024) - Published 15 May, 2024

New results on asymptotic state interconversion open the way for novel coherent thermodynamic protocols.

Optimization Tools for Distance-Preserving Flag Fault-Tolerant Error Correction

Balint Pato, Theerapat Tansuwannont, Shilin Huang, and Kenneth R. Brown

PRX Quantum 5, 020336 (2024) - Published 16 May, 2024

Three optimization tools that make fault-tolerant error correction more practical are introduced to reduce resource requirements and improve the performance of a wide class of quantum error-correcting codes.

Sufficient Condition for Universal Quantum Computation Using Bosonic Circuits

Cameron Calcluth, Nicolas Reichel, Alessandro Ferraro, and Giulia Ferrini

PRX Quantum 5, 020337 (2024) - Published 17 May, 2024

A sufficient condition for universal quantum computation with continuous-variable systems is derived through a novel generalized mapping between bosonic and qubit states.

Native Two-Qubit Gates in Fixed-Coupling, Fixed-Frequency Transmons Beyond Cross-Resonance Interaction

Ken Xuan Wei, Isaac Lauer, Emily Pritchett, William Shanks, David C. McKay, and Ali Javadi-Abhari

PRX Quantum 5, 020338 (2024) - Published 20 May, 2024

An experimental realization of isᴡᴀᴘ and B gates in fixed-coupling transmon processors shows that these systems support multiple high-fidelity native two-qubit gates.

Cavity-Mediated Entanglement of Parametrically Driven Spin Qubits via Sidebands

V. Srinivasa, J. M. Taylor, and J. R. Petta

PRX Quantum 5, 020339 (2024) - Published 21 May, 2024

A new study unveils a step-by-step framework for engineering tunable entanglement between spin qubits in quantum dots via the sidebands of driven qubits, paving the way for modular quantum information processing in these solid-state platforms.

Quantum Circuits with Multiterminal Josephson-Andreev Junctions

F.J. Matute-Cañadas, L. Tosi, and A. Levy Yeyati

PRX Quantum 5, 020340 (2024) - Published 22 May, 2024

A novel platform based on multiterminal Josephson junctions in hybrid semiconductor-superconductor structures provides a potential path toward the realization of protected qubits.

Quantum-Inspired Classical Algorithm for Graph Problems by Gaussian Boson Sampling

Changhun Oh, Bill Fefferman, Liang Jiang, and Nicolás Quesada

PRX Quantum 5, 020341 (2024) - Published 23 May, 2024

A quantum-inspired classical method is employed to solve graph theory problems with a comparable performance to Gaussian boson sampling.

Microwave Photon Detection at Parametric Criticality

Kirill Petrovnin, Jiaming Wang, Michael Perelshtein, Pertti Hakonen, and Gheorghe Sorin Paraoanu

PRX Quantum 5, 020342 (2024) - Published 24 May, 2024

Microwave single-photon detection has been realized experimentally with a superconducting Josephson device operated near the parametric critical point.

Diagnostics of Mixed-State Topological Order and Breakdown of Quantum Memory

Ruihua Fan, Yimu Bao, Ehud Altman, and Ashvin Vishwanath

PRX Quantum 5, 020343 (2024) - Published 24 May, 2024

Novel results use intrinsic mixed-state properties of decohered topological quantum memory to characterize its optimal decoding threshold.

Site-Selective Preparation and Multistate Readout of Molecules in Optical Tweezers

Lewis R. B. Picard, Gabriel E. Patenotte, Annie J. Park, Samuel F. Gebretsadkan, and Kang-Kuen Ni

PRX Quantum 5, 020344 (2024) - Published 28 May, 2024

Harnessing the multilevel structure and constituent atoms of polar molecules allows us to extend the state preparation and measurement capabilities for broad applicability in quantum information, simulation, and metrology.

Fault-Tolerant Code-Switching Protocols for Near-Term Quantum Processors

Friederike Butt, Sascha Heußen, Manuel Rispler, and Markus Müller

PRX Quantum 5, 020345 (2024) - Published 28 May, 2024

New quantum circuit designs that implement fault-tolerant code-switching protocols are developed to run on realistic noisy quantum hardware.

Deterministic Generation of Qudit Photonic Graph States from Quantum Emitters

Zahra Raissi, Edwin Barnes, and Sophia E. Economou

PRX Quantum 5, 020346 (2024) - Published 29 May, 2024

An approach to deterministically generate any multiphoton qudit graph state, including those needed for a range of photonic quantum information technologies, is presented.

Postselection-Free Learning of Measurement-Induced Quantum Dynamics

Max McGinley

PRX Quantum 5, 020347 (2024) - Published 29 May, 2024

New techniques are developed that allow quantum many-body properties to be probed in a scalable way, facilitating future investigations of quantum measurements.

Certified Randomness in Tight Space

Andreas Fyrillas, Boris Bourdoncle, Alexandre Maïnos, Pierre-Emmanuel Emeriau, Kayleigh Start, Nico Margaria, Martina Morassi, Aristide Lemaître, Isabelle Sagnes, Petr Stepanov, Thi Huong Au, Sébastien Boissier, Niccolo Somaschi, Nicolas Maring, Nadia Belabas, and Shane Mansfield

PRX Quantum 5, 020348 (2024) - Published 30 May, 2024

A demonstration of practical, on-chip certified-random-number generation with photonic qubits achieves the highest standard in randomness.

Analog Information Decoding of Bosonic Quantum Low-Density Parity-Check Codes

Lucas Berent, Timo Hillmann, Jens Eisert, Robert Wille, and Joschka Roffe

PRX Quantum 5, 020349 (2024) - Published 30 May, 2024

Novel decoding methods leverage analog measurement information in bosonic quantum low-density parity-check codes.

Measurement of Ultrashort Biphoton Correlation Times with an Integrated Two-Color Broadband SU(1,1)-Interferometer

F. Roeder, R. Pollmann, M. Stefszky, M. Santandrea, K.-H. Luo, V. Quiring, R. Ricken, C. Eigner, B. Brecht, and C. Silberhorn

PRX Quantum 5, 020350 (2024) - Published 31 May, 2024

SU(1,1) interferometry is used to measure the simultaneity of two photons from a time-frequency entangled pair, assessing their suitability for ultrafast quantum spectroscopy.

Optimization of Time-Ordered Processes in the Finite and Asymptotic Regimes

Mirjam Weilenmann, Costantino Budroni, and Miguel Navascués

PRX Quantum 5, 020351 (2024) - Published 3 June, 2024

A new study introduces effective solutions for sequential quantum information tasks, enhancing finite-state automaton analysis, many-body entanglement detection, and adaptive protocol development for magic state detection.

Efficient Large-Scale Many-Body Quantum Dynamics via Local-Information Time Evolution

Claudia Artiaco, Christoph Fleckenstein, David Aceituno Chávez, Thomas Klein Kvorning, and Jens H. Bardarson

PRX Quantum 5, 020352 (2024) - Published 4 June, 2024

The local-information time-evolution approach efficiently simulates the dynamics of local observables in many-body quantum systems by systematically removing large-scale correlations via the information lattice.

High-Fidelity Spin Qubit Shuttling via Large Spin-Orbit Interactions

Stefano Bosco, Ji Zou, and Daniel Loss

PRX Quantum 5, 020353 (2024) - Published 5 June, 2024

A substantial enhancement in the speed and fidelity of shuttling due to a large spin-orbit interaction paves the way for realizing scalable semiconductor quantum computers.

Exact Quantum Sensing Limits for Bosonic Dephasing Channels

Zixin Huang, Ludovico Lami, and Mark M. Wilde

PRX Quantum 5, 020354 (2024) - Published 6 June, 2024

Novel results determine the fundamental physical limitations on how well one can discriminate between two or more different bosonic dephasing noise mechanisms.

Fault-Tolerant Quantum Computation Using Large Spin-Cat Codes

Sivaprasad Omanakuttan, Vikas Buchemmavari, Jonathan A. Gross, Ivan H. Deutsch, and Milad Marvian

PRX Quantum 5, 020355 (2024) - Published 7 June, 2024

Spin-cat codes in neutral-atom qubits yield the potential for fault tolerance with a high threshold and low resource overhead.

Full-Permutation Dynamical Decoupling in Triple-Quantum-Dot Spin Qubits

Bo Sun, Teresa Brecht, Bryan H. Fong, Moonmoon Akmal, Jacob Z. Blumoff, Tyler A. Cain, Faustin W. Carter, Dylan H. Finestone, Micha N. Fireman, Wonill Ha, Anthony T. Hatke, Ryan M. Hickey, Clayton A. C. Jackson, Ian Jenkins, Aaron M. Jones, Andrew Pan, Daniel R. Ward, Aaron J. Weinstein, Samuel J. Whiteley, Parker Williams, Matthew G. Borselli, Matthew T. Rakher, and Thaddeus D. Ladd

PRX Quantum 5, 020356 (2024) - Published 11 June, 2024

A qubit based on a triple quantum dot extends its coherence time by carefully shuffling the locations of its electrons.

Retrieving Nonlinear Features from Noisy Quantum States

Benchi Zhao, Mingrui Jing, Lei Zhang, Xuanqiang Zhao, Yu-Ao Chen, Kun Wang, and Xin Wang

PRX Quantum 5, 020357 (2024) - Published 12 June, 2024

A novel, scalable entanglement-enhanced method for retrieving high-order moments from noisy quantum states offers a promising approach for practical quantum devices.

Ultracold LiCr: A New Pathway to Quantum Gases of Paramagnetic Polar Molecules

S. Finelli, A. Ciamei, B. Restivo, M. Schemmer, A. Cosco, M. Inguscio, A. Trenkwalder, K. Zaremba-Kopczyk, M. Gronowski, M. Tomza, and M. Zaccanti

PRX Quantum 5, 020358 (2024) - Published 12 June, 2024

Production of ultracold lithium-chromium (LiCr) molecules and thorough characterization of their properties establishes LiCr as a prime candidate for the realization of quantum gases of doubly polar molecules.

Saturating the Maximum Success Probability Bound for Noiseless Linear Amplification Using Linear Optics

Joshua J. Guanzon, Matthew S. Winnel, Deepesh Singh, Austin P. Lund, and Timothy C. Ralph

PRX Quantum 5, 020359 (2024) - Published 13 June, 2024

The Knill-Laflamme-Milburn teleporter is adapted to a proposed near-optimal linear-optics noiseless amplifier.

Cross-Cap Defects and Fault-Tolerant Logical Gates in the Surface Code and the Honeycomb Floquet Code

Ryohei Kobayashi and Guanyu Zhu

PRX Quantum 5, 020360 (2024) - Published 13 June, 2024

A novel study shows that nonorientable space enables new, almost transversal, logical gates that can help eliminate large error propagation in the standard surface code.

Variational Adiabatic Transport of Tensor Networks

Hyeongjin Kim, Matthew Fishman, and Dries Sels

PRX Quantum 5, 020361 (2024) - Published 14 June, 2024

An adiabatic gauge potential is constructed to improve upon standard DMRG methods for computing low-energy spectra of quantum many-body systems, allowing the efficient and automatic scanning of the entire phase diagram.

Towards Adiabatic Quantum Computing Using Compressed Quantum Circuits

Conor Mc Keever and Michael Lubasch

PRX Quantum 5, 020362 (2024) - Published 14 June, 2024

Tensor network algorithms optimize fixed-depth quantum circuits to capture adiabatic evolution, enabling adiabatic quantum computing on gate-based devices.

High-Rate and High-Fidelity Modular Interconnects between Neutral Atom Quantum Processors

Yiyi Li and Jeff D. Thompson

PRX Quantum 5, 020363 (2024) - Published 20 June, 2024

Enhanced scalability in Yb atom qubit arrays can be achieved by connecting neutral-atom quantum computer modules with high-fidelity entanglement at rates approaching 105 Bell pairs per second.

Practical Trainable Temporal Postprocessor for Multistate Quantum Measurement

Saeed A. Khan, Ryan Kaufman, Boris Mesits, Michael Hatridge, and Hakan E. Türeci

PRX Quantum 5, 020364 (2024) - Published 21 June, 2024

A machine-learning approach to readout of general quantum systems improves real-time processing of measurement data by adapting to complex quantum noise conditions.

Adiabatic Time Evolution of Highly Excited States

Hadi Yarloo, Hua-Chen Zhang, and Anne E. B. Nielsen

PRX Quantum 5, 020365 (2024) - Published 24 June, 2024

Novel results show that many-body scars are suitable for adiabatic evolution despite the absence of energy gaps.

Optimal Zeno Dragging for Quantum Control: A Shortcut to Zeno with Action-Based Scheduling Optimization

Philippe Lewalle, Yipei Zhang, and K. Birgitta Whaley

PRX Quantum 5, 020366 (2024) - Published 26 June, 2024

Measurement-driven control can optimally use the Zeno effect to realize robust and rapid quantum state transfer.

Learning Quantum Processes Without Input Control

Marco Fanizza, Yihui Quek, and Matteo Rosati

PRX Quantum 5, 020367 (2024) - Published 27 June, 2024

A statistical learning theory, based on empirical risk minimization and a generalization of shadow tomography, is developed for learning processes that map a classical input to a quantum output.

Generalized Quantum Signal Processing

Danial Motlagh and Nathan Wiebe

PRX Quantum 5, 020368 (2024) - Published 28 June, 2024

The class of functions that can be used in quantum signal processing is expanded, providing new tools for quantum algorithm development.

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