Papers
Live trends in quantum computing research, updated daily from arXiv.
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Modular Theory and the Bell-CHSH inequality in relativistic scalar Quantum Field Theory
J. G. A. Caribé, M. S. Guimaraes, I. Roditi +1 more·Mar 26, 2026
The Tomita-Takesaki modular theory is employed to discuss the Bell-CHSH inequality in wedge regions. By using the Bisognano-Wichmann results, the construction of a set of wedge localized vectors in the one-particle Hilbert space of a relativistic mas...
Closed-Form Formulas for Designing Ultra-Low Phase-Noise Cross-Coupled Dynamically Body-Biased Only-NMOS LCVCOs
Naser Khatti Dizabadi, Peter LoPresti·Mar 26, 2026
This paper presents a system-level analytical framework for modeling and minimizing phase noise in body-biased cross-coupled LC-tank voltage-controlled oscillators (LC-VCOs). Building upon Impulse Sensitivity Function (ISF) theory, the impulse sensit...
Theory of (Co)homological Invariants on Quantum LDPC Codes
Zimu Li, Yuguo Shao, Fuchuan Wei +2 more·Mar 26, 2026
With recent breakthroughs in the construction of good qLDPC codes and nearly good qLTCs, the study of (co)homological invariants of quantum code complexes, which fundamentally underlie their logical operations, has become evidently important. In this...
Ultrabroadband Passive Laser Noise Suppression to Quantum Noise Limit through on-chip Second Harmonic Generation
Geun Ho Ahn, Ziyu Wang, Devin J. Dean +5 more·Mar 26, 2026
Laser intensity noise limits performance in quantum sensing, metrology, and computing. Existing stabilization methods face a trade-off between bandwidth and complexity: electronic feedback loops are speed-limited, while optical resonators are constra...
Typical entanglement in anyon chains: Page curves beyond Lie group symmetries
Yale Yauk, Lucas Hackl, Alexander Hahn·Mar 26, 2026
We study bipartite entanglement statistics in one-dimensional anyon chains, whose Hilbert spaces are constrained by fusion rules of unitary pre-modular categories. Our setup generalizes previous frameworks on symmetry-resolved entanglement entropy fo...
Negative energies and the breakdown of bulk geometry
John Preskill, Mykhaylo Usatyuk, Shreya Vardhan·Mar 26, 2026
One central question in quantum gravity is to understand how and why predictions from semiclassical gravity can break down in regimes with low spacetime curvature. One diagnostic of such a breakdown is that states which are orthonormal at the semicla...
A Dipolar Chiral Spin Liquid on the Breathed Kagome Lattice
Francisco Machado, Sabrina Chern, Michael P. Zaletel +1 more·Mar 26, 2026
Continuous control over lattice geometry, when combined with long-range interactions, offers a powerful yet underexplored tool to generate highly frustrated quantum spin systems. By considering long-range dipolar antiferromagnetic interactions on a b...
Krylov-space anatomy and spread complexity of a disordered quantum spin chain
Bikram Pain, David E. Logan, Sthitadhi Roy·Mar 26, 2026
We investigate the anatomy and complexity of quantum states in Krylov space, in the ergodic and many-body localised (MBL) phases of a disordered, interacting spin chain. The Krylov basis generated by the Hamiltonian from an initial state provides a r...
Critical curve of two-matrix models $ABBA$, $A\{B,A\}B$ and $ABAB$, Part I: Monte Carlo
Carlos I. Pérez Sánchez·Mar 26, 2026
For a family of two-matrix models \[ \frac{1}{2} \operatorname{Tr}(A^2+B^2) - \frac{g}{4} \operatorname{Tr}(A^4+B^4) - \begin{cases} \frac{h}{2} \operatorname{Tr}( A BA B) \\ \frac{h}{4} \operatorname{Tr}( A BA B+ ABBA ) \\ \frac{h}{2} \operatorname{...
Provably Efficient Long-Time Exponential Decompositions of Non-Markovian Gaussian Baths
Zhen Huang, Zhiyan Ding, Ke Wang +3 more·Mar 26, 2026
Gaussian baths are widely used to model non-Markovian environments, yet the cost of accurate simulation at long times remains poorly understood, especially when spectral densities exhibit nonanalytic behavior as in a range of realistic models. We rig...
A Unified Memory Perspective for Probabilistic Trustworthy AI
Xueji Zhao, Likai Pei, Jianbo Liu +2 more·Mar 26, 2026
Trustworthy artificial intelligence increasingly relies on probabilistic computation to achieve robustness, interpretability, security and privacy. In practical systems, such workloads interleave deterministic data access with repeated stochastic sam...
Scalable Quantum Interference from Indistinguishable Quantum Dots
Sheena Shaji, Suraj Goel, Julian Wiercinski +7 more·Mar 26, 2026
Quantum interference of indistinguishable photons is the foundation of photonic quantum technologies, yet scaling from a few to many identical quantum light sources remains a major challenge. In solid-state platforms, spatial and spectral inhomogenei...
EPAR: Electromagnetic Pathways to Architectural Reliability in Quantum Processors
Navnil Choudhury, Yizhuo Tan, Jiaqi Yu +2 more·Mar 26, 2026
As superconducting processors scale, understanding how physical layout shapes qubit interactions is essential for architectural reliability. Existing methods offer limited insight into how electromagnetic design choices translate into execution-level...
Non-linear Sigma Model for the Surface Code with Coherent Errors
Stephen W. Yan, Yimu Bao, Sagar Vijay·Mar 26, 2026
The surface code is a promising platform for a quantum memory, but its threshold under coherent errors remains incompletely understood. We study maximum-likelihood decoding of the square-lattice surface code in the presence of single-qubit unitary ro...
Prediction of new superconducting bilayers heterostructures using quantum confinement and proximity effects
Giovanni A. Ummarino, Alessio Zaccone·Mar 26, 2026
A central challenge in nanoscale superconductivity is to understand and exploit the combined action of quantum confinement and proximity effects in experimentally realistic metallic heterostructures. We theoretically investigate superconducting bilay...
Symplectic Split-Operator Propagators from Tridiagonalized Multi-Mode Bosonic Hilbert Spaces for Bose-Hubbard Hamiltonians
Denys I. Bondar, Ole Steuernagel·Mar 26, 2026
In this methods paper, we show how to tridia\-go\-nalize two families of bosonic multimode systems: optomechanical and Bose-Hubbard hamiltonians. Using tools from number theory, we devise a rendering of these systems in the form of exact $D \times D$...
Weighted Nested Commutators for Scalable Counterdiabatic State Preparation
Jialiang Tang, Xi Chen, Zhi-Yuan Wei·Mar 26, 2026
Counterdiabatic (CD) driving enables efficient quantum state preparation, but it requires implementing highly nonlocal adiabatic gauge potentials (AGP) that are impractical to compute and realize in large many-body systems. We introduce a \textit{wei...
Structured-Light Magnetometry in a Coherently Controlled Atomic Medium
Parkhi Bhardwaj, Shubhrangshu Dasgupta·Mar 26, 2026
A structured-light-based approach for detecting magneto-optical rotation is presented, in which polarization rotation is mapped onto a directly observable spatial degree of freedom. A radially polarized Laguerre-Gaussian beam interacts with cold $^{8...
Robust continuous-variable multipartite entanglement in circular arrays of nonlinear waveguides
Sugar Singh Meena, David Barral, Ankan Das Roy +2 more·Mar 26, 2026
Encoding continuous-variable quantum information in the optical domain has recently enabled the generation of large entangled states, yet robust implementation remains a challenge. Here, we present a straightforward protocol for generating multiparti...
Puiseux series about exceptional singularities dictated by symmetry-allowed Hessenberg forms of perturbation matrices
Ipsita Mandal·Mar 26, 2026
We develop a systematic framework for determining the nature of exceptional points of $n^{\rm th}$ order (EP$_n$s) in non-Hermitian (NH) systems, represented by complex square matrices. By expressing symmetry-preserving perturbations in the Jordan-no...