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PRX Quantum - January 2024

PRX Quantum

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Volume 5, Issue 1 (partial)

January - March 2024
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Tutorial
Scrambling Dynamics and Out-of-Time-Ordered Correlators in Quantum Many-Body Systems
Shenglong Xu and Brian Swingle
PRX Quantum 5, 010201 (2024) – Published 22 January 2024

A deep dive on scrambling dynamics in quantum many-body systems is presented, with a detailed overview of out-of-time-ordered correlators, including how to calculate and measure them.

Improved Single-Shot Qubit Readout Using Twin rf-SET Charge Correlations
Santiago Serrano, MengKe Feng, Wee Han Lim, Amanda E. Seedhouse, Tuomo Tanttu, Will Gilbert, Christopher C. Escott, Nikolay V. Abrosimov, Hans-Joachim Pohl, Michael L.W. Thewalt, Fay E. Hudson, Andre Saraiva, Andrew S. Dzurak, and Arne Laucht
PRX Quantum 5, 010301 (2024) – Published 3 January 2024

Combining modulation with correlation of multiple sensor signals promises an increase in qubit readout fidelities.

Fault-Tolerant Postselection for Low-Overhead Magic State Preparation
Héctor Bombín, Mihir Pant, Sam Roberts, and Karthik I. Seetharam
PRX Quantum 5, 010302 (2024) – Published 4 January 2024

A general framework for fault-tolerant postselection of surface code channels is introduced that reduces logical error rates and lowers resource overhead, advancing the field of quantum error correction.

Telecom Networking with a Diamond Quantum Memory
Eric Bersin et al.
PRX Quantum 5, 010303 (2024) – Published 8 January 2024

A low-noise quantum frequency conversion system enables a solid-state qubit in diamond to directly interface with telecom-band systems.

Nonlocal Finite-Depth Circuits for Constructing Symmetry-Protected Topological States and Quantum Cellular Automata
David T. Stephen, Arpit Dua, Ali Lavasani, and Rahul Nandkishore
PRX Quantum 5, 010304 (2024) – Published 11 January 2024

A new analysis sheds light on the phases of matter beyond the assumption of geometric locality, which would be key to understanding the physics that underpins quantum simulators.

Algorithmic Cluster Expansions for Quantum Problems
Ryan L. Mann and Romy M. Minko
PRX Quantum 5, 010305 (2024) – Published 16 January 2024

A general framework that uses the cluster expansion to establish efficient classical approximation algorithms for quantum problems.

Compressed Gate Characterization for Quantum Devices with Time-Correlated Noise
M.J. Gullans, M. Caranti, A.R. Mills, and J.R. Petta
PRX Quantum 5, 010306 (2024) – Published 18 January 2024

A new quantum process tomography framework tackles time-correlated noise, enhancing efficiency and fidelity in silicon spin qubits and paving the way for scalable quantum computing.

Photon-Noise-Tolerant Dispersive Readout of a Superconducting Qubit Using a Nonlinear Purcell Filter
Yoshiki Sunada, Kenshi Yuki, Zhiling Wang, Takeaki Miyamura, Jesper Ilves, Kohei Matsuura, Peter A. Spring, Shuhei Tamate, Shingo Kono, and Yasunobu Nakamura
PRX Quantum 5, 010307 (2024) – Published 19 January 2024

A nonlinear filter protects the qubit from noise-induced decoherence but automatically deactivates when a readout pulse is applied, enabling a fast, high-fidelity readout of a superconducting qubit.

Featured in Physics
Efficient Tensor Network Simulation of IBM's Eagle Kicked Ising Experiment
Joseph Tindall, Matthew Fishman, E. Miles Stoudenmire, and Dries Sels
PRX Quantum 5, 010308 (2024) – Published 23 January 2024

Improved classical methods for Hamiltonian simulation further shift the threshold for quantum utility.

Entanglement Transitions in Unitary Circuit Games
Raúl Morral-Yepes, Adam Smith, S.L. Sondhi, and Frank Pollmann
PRX Quantum 5, 010309 (2024) – Published 24 January 2024

A game in which two players compete to generate area- or volume-law entanglement may undergo novel types of quantum phase transitions.

Two-Dimensional Momentum State Lattices
Shraddha Agrawal, Sai Naga Manoj Paladugu, and Bryce Gadway
PRX Quantum 5, 010310 (2024) – Published 25 January 2024

A new experimental approach is developed for building two-dimensional tight-binding models using selectively addressed Bragg resonances.

Quantum Sensing in Tweezer Arrays: Optical Magnetometry on an Individual-Atom Sensor Grid
Dominik Schäffner, Tobias Schreiber, Fabian Lenz, Malte Schlosser, and Gerhard Birkl
PRX Quantum 5, 010311 (2024) – Published 26 January 2024

A quantum sensor based on an array of neutral atoms measured in parallel is applied to obtain the spatial distribution of a magnetic field with microscale resolution.

Single-Photon Source Over the Terahertz Regime
Caspar Groiseau, Antonio I. Fernández-Domínguez, Diego Martín-Cano, and Carlos Sánchez Muñoz
PRX Quantum 5, 010312 (2024) – Published 29 January 2024

Polar emitters are used in a proposal to realize single-photon sources in the terahertz regime, promising optical tunability of the frequency of emission and its nonclassical statistics.

Entanglement Phase Transition Due to Reciprocity Breaking without Measurement or Postselection
Gideon Lee, Tony Jin, Yu-Xin Wang (王语馨), Alexander McDonald, and Aashish Clerk
PRX Quantum 5, 010313 (2024) – Published 31 January 2024

The bosonic Kitaev chain connects non-Hermitian physics and many-body phase transitions by displaying a measurement-free entanglement phase transition enabled by the non-Hermitian skin effect.

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