Papers
Live trends in quantum computing research, updated daily from arXiv.
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Emergent continuous symmetry and ground-state factorization induced by long-range interactions
Yue Yu, Myung-Joong Hwang·Oct 9, 2025
The spontaneous breaking of a $Z_2$ symmetry typically gives rise to emergent excitations possessing the same symmetry with a renormalized mass. Contrary to this conventional wisdom, we present a theory in which the low-lying excitation in the broken...
Optimal quantum spectroscopy using single-photon pulses
Sourav Das, Aiman Khan, Francesco Albarelli +1 more·Oct 9, 2025
We provide the ultimate precision attainable in spectroscopy of a quantum emitter using single-photon pulses. We find the maximum for estimating the linewidth to be independent of the details of the emitter's bare Hamiltonian while that for the detun...
Uniform mixing in continuous-time quantum walks on oriented, nonabelian Cayley graphs
Peter Sin·Oct 9, 2025
A family of oriented, normal, nonabelian Cayley graphs is presented, whose continuous-time quantum walks exhibit uniform mixing.
Entanglement of mechanical oscillators mediated by a Rydberg tweezer chain
Cedric Wind, Chris Nill, Julia Gamper +5 more·Oct 9, 2025
Mechanical systems provide a unique test bed for studying quantum phenomena at macroscopic length scales. However, realizing quantum states that feature quantum correlations among macroscopic mechanical objects remains an experimental challenge. Here...
Selective high-order topological states and tunable chiral emission in atomic metasurfaces
Yi-Xin Wang, Yan Zhang, Lei Du +2 more·Oct 9, 2025
Atomic metasurfaces (AMs) provide a powerful nanophotonic platform for integrating topological effects into quantum many-body systems. In this Letter, we investigate the quantum optical and topological properties of a two-dimensional Kagome AM, going...
Adaptive Sparsification for Linear Programming
Étienne Objois, Adrian Vladu·Oct 9, 2025
We introduce a generic framework for solving linear programs (LPs) with many constraints $(n \gg d)$ via adaptive sparsification. Our approach provides a principled generalization of the techniques of [Assadi '23] from matching problems to general LP...
Entanglement Growth from Entangled States: A Unified Perspective on Entanglement Generation and Transport
Chun-Yue Zhang, Zi-Xiang Li, Shi-Xin Zhang·Oct 9, 2025
Studies of entanglement dynamics in quantum many-body systems have focused largely on initial product states. Here, we investigate the far richer dynamics from initial entangled states, uncovering universal patterns across diverse systems ranging fro...
Computing moment polytopes -- with a focus on tensors, entanglement and matrix multiplication
Maxim van den Berg, Matthias Christandl, Vladimir Lysikov +3 more·Oct 9, 2025
Tensors are fundamental in mathematics, computer science, and physics. Their study through algebraic geometry and representation theory has proved very fruitful in the context of algebraic complexity theory and quantum information. In particular, mom...
Quantum variance and fluctuations for Walsh-quantized baker's maps
Laura Shou·Oct 9, 2025
The Walsh-quantized baker's maps are models for quantum chaos on the torus. We show that for all baker's map scaling factors $D\ge2$ except for $D=4$, typically (in the sense of Haar measure on the eigenspaces, which are degenerate) the empirical dis...
The power of quantum catalytic local operations
Patryk Lipka-Bartosik, Jessica Bavaresco, Nicolas Brunner +1 more·Oct 9, 2025
A key result in entanglement theory is that the addition of a catalyst dramatically enlarges the set of possible state transformations via local operations and classical communication (LOCC). However, it remains unclear what is the interplay between ...
Characterizing Space-Constrained Implementability of Quantum Instruments via Signaling Conditions
Kosuke Matsui, Jun-Yi Wu, Hayata Yamasaki +2 more·Oct 9, 2025
Scaling up the number of qubits available on quantum processors remains technically demanding even in the long term; it is therefore crucial to clarify the number of qubits required to implement a given quantum operation. For the most general class o...
Clifford+V synthesis for multi-qubit unitary gates
Soichiro Yamazaki, Seiseki Akibue·Oct 9, 2025
We developed a general framework for synthesizing target gates by using a finite set of basic gates, which is a crucial step in quantum compilation. When approximating a gate in SU($n$), a naive brute-force search requires a computational complexity ...
Quantum memory optimisation using finite-horizon, decoherence time and discounted mean-square performance criteria
Igor G. Vladimirov, Ian R. Petersen, Guodong Shi·Oct 9, 2025
This paper is concerned with open quantum memory systems for approximately retaining quantum information, such as initial dynamic variables or quantum states to be stored over a bounded time interval. In the Heisenberg picture of quantum dynamics, th...
Adversarial Thermodynamics
Maite Arcos, Philippe Faist, Takahiro Sagawa +1 more·Oct 9, 2025
In thermodynamics, an agent's ability to extract work is fundamentally constrained by their environment. Traditional frameworks struggle to capture how strategic decision-making under uncertainty, particularly an agent's tolerance for risk, determine...
Exponential Speed-ups for Structured Goemans-Williamson relaxations via Quantum Gibbs States and Pauli Sparsity
Haomu Yuan, Daniel Stilck França, Ilia Luchnikov +3 more·Oct 9, 2025
Quadratic Unconstrained Binary Optimization (QUBO) problems are prevalent in various applications and are known to be NP-hard. The seminal work of Goemans and Williamson introduced a semidefinite programming (SDP) relaxation for such problems, solvab...
Transversal gates for probabilistic implementation of multi-qubit Pauli rotations
Nobuyuki Yoshioka, Alireza Seif, Andrew Cross +1 more·Oct 9, 2025
We introduce a general framework for weak transversal gates -- probabilistic implementation of logical unitaries realized by local physical unitaries -- and propose a novel partially fault-tolerant quantum computing architecture that surpasses the st...
Non-Hermitian many-body localization in asymmetric chains with long-range interaction
Wen Wang, Han-Ze Li, Jian-Xin Zhong·Oct 9, 2025
Understanding the relationship between many-body localization and spectra in non-Hermitian many-body systems is crucial. In a one-dimensional clean, long-range interaction-induced non-Hermitian many-body localization system, we have discovered the co...
A Binary Optimisation Algorithm for Near-Term Photonic Quantum Processors
Alexander Makarovskiy, Mateusz Slysz, Łukasz Grodzki +5 more·Oct 9, 2025
Binary optimisation tasks are ubiquitous in areas ranging from logistics to cryptography. The exponential complexity of such problems means that the performance of traditional computational methods decreases rapidly with increasing problem sizes. Her...
Low-depth measurement-based deterministic quantum state preparation
Roselyn Nmaju, Fiona Speirits, Sarah Croke·Oct 9, 2025
We present a low-depth amplitude encoding method for arbitrary quantum state preparation. Building on the foundation of an existing divide-and-conquer algorithm, we propose a method to disentangle the ancillary qubits from the final state. Our method...
Work distribution of quantum fields in static curved spacetimes
Rafael L. S. Costa, Marcos L. W. Basso, Jonas Maziero +1 more·Oct 9, 2025
We investigate the formulation of work distributions for quantum scalar fields in static curved spacetimes by extending the Ramsey interferometric protocol originally developed in previous works for flat spacetimes. The use of Unruh-DeWitt particle d...