PRX Quantum

An efficient quantum algorithm solves the Abelian state hidden subgroup problem, unifying key symmetry-learning primitives. @jenseisert Read more: go.aps.org/4vablPW

A principled link between noise resilience and circuit expressivity provides a roadmap for navigating barren plateaus and optimizing the training of variational quantum algorithms. Read the paper: go.aps.org/4e1LXGp

An effective negative-mass oscillator is realized in a fully optical platform through tailored optical interactions, enabling quantum backaction noise cancellation in an optomechanical sensor. Paper: go.aps.org/4wZtfXA Focus: go.aps.org/42OBdFa

Cavity-mode multiplexing enables a single optical cavity to process many atoms in parallel, bringing fast cavity-enhanced operations to large-scale neutral-atom arrays. @RLEatMIT @AquaZiv Read more: go.aps.org/4a0wwf4

Careful tuning of qubit-coupler interactions and a new calibration protocol enable simultaneous high-fidelity single-qubit gates, controlled-𝘡 gates, and readout in superconducting circuits, advancing scalable quantum computing. Read more: go.aps.org/4u6a2kp

Partially randomized product formulas slash the Hamiltonian simulation overhead in quantum phase estimation, offering orders-of-magnitude resource savings for quantum chemistry benchmarks. Read the paper: go.aps.org/4fulSAP

New probes of string breaking reveal experimentally accessible regimes in which the confining strings do not simply break but exhibit complex quantum dynamics. Read the paper: go.aps.org/3PdCsKR

Adaptive subspace-switching readout improves nondemolition measurements in multilevel quantum systems, boosting qudit readout fidelity to 99.61% while reducing measurement time and mitigating measurement-induced errors across platforms. go.aps.org/4tAE7rW

Classical simulation of a large class of logical magic state preparation protocols is made scalable and efficient via propagating errors to the end of the circuit. Read the paper: go.aps.org/4nsPoJj

An investigation of Haar-random quantum codes reveals a simple mechanism for the transition between decodable and nondecodable phases of quantum codes under local noise. Read the paper: go.aps.org/42vYV92

ICYMI: A method to characterize an array of sequentially entangled qubits is proposed and used to find the density matrix of a 35-qubit microwave cluster state, paving the way for efficient benchmarking and troubleshooting of entangled-photon generation. go.aps.org/4naucrg

A comprehensive noise modeling approach for transmon-based quantum processors captures complex spatiotemporally correlated errors, achieving a sevenfold improvement in accuracy when used as a hardware proxy simulator for variational algorithms. go.aps.org/49KzNiy

A new family of quantum low-density parity-check codes, which are locally equivalent to higher-dimensional hypergraph-product codes, achieves single-shot fault tolerance and an approximately 1.1% pseudothreshold with significantly shorter block lengths. go.aps.org/4nmtZBm

ICYMI: Strong evidence links nonlocal magic to the hardness of classical simulation and the nonflatness of the entanglement spectrum, shedding light on gravitational emergence. go.aps.org/3P01wov

Performance of many parallel measurements on quantum LDPC codes, a key capability for protecting quantum memories during computation, is achieved in a new scheme that preserves important code properties without requiring additional code blocks. go.aps.org/4tukOjX

ICYMI: Scalable and accurate reconstruction of physically motivated noise models is made possible using classical postprocessing for gate inversion and only single-qubit state preparation and measurement. go.aps.org/48NSuSe

By tuning the pairwise exchange interactions between three exchange-coupled electrons to be exactly equal, an energy gap between the computational subspace and extraneous levels is created, suppressing leakage errors. go.aps.org/4u7P0T5

ICYMI: A randomized quantum algorithm replaces costly Hamiltonian simulation with an efficient walk operator, offering optimal performance guarantees and paving a practical path to quantum advantage in solving linear systems. go.aps.org/3Pppbib

ICYMI: For a 2D array of entangled qubits, it is shown that in the presence of both qubit loss and coherent error, the Clifford percolation transition flows to the Nishimori universality class, exhibiting distinctive multifractal critical phenomena. go.aps.org/3QS3Jmp

Using a procedure based on symmetric tensor decomposition, every photonic state can be prepared with realistic experimental tools and a predictable number of steps. Read the paper: go.aps.org/3Rpl8mw