Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
A Unified Quantum Neural Network Framework for Hamiltonian Learning and Emulation of Unknown Quantum Systems
Ahmad Salmanogli·Aug 24, 2026
Accurate identification of unknown quantum systems is essential for quantum computing, sensing, and control because the Hamiltonian governs quantum state evolution. This work proposes a QNN based framework for black box Hamiltonian learning and quant...
Exact and Optimal Recursive Quantum Search via Hilbert-Space Decomposition
John Burke, Ciaran McGoldrick·Aug 24, 2026
Current approaches to quantum search fail to deeply exploit extant structure in the underlying Hilbert space. Decomposing the search by this structure empowers new strategies and formulations for quantum search and algorithm design. We present a new ...
`It from Bit': is there a second law of quantum complexity?
S. Davatolhagh, A. Sheykhi, M. H. Zarei·Aug 24, 2026
At a deeper level the principle of least action is interpreted as the law of least entropy increase consistent with Prigogine's principle of minimum entropy production, and the implications of quasistatic information quantization rule (Proc. R. Soc. ...
Batched and Complete U-Statistics for Trace-Polynomial Estimation from Classical Shadows
Xinyu Song·Aug 24, 2026
We study estimation of the trace polynomial $\operatorname{tr} p(PρP)$ from global classical shadows, where $ρ$ is an unknown quantum state and $P$ is a fixed projector. Disjoint batching and complete U-statistics yield unbiased estimators of the sam...
Geometry-calibrated equilibrium sensing for inverse design of nonlocal topological photonic lattices
Fatemeh Davoodi, Jeffrey McCord·Aug 24, 2026
Topological photonic lattices are commonly designed using short-range Hamiltonians, yet realistic nanophotonic structures are governed by geometry- and wavelength-dependent long-range electromagnetic interactions. Here we introduce a geometry-calibra...
Universal equilibrium magic in quantum many-body systems
Soumyadeep Sarma, Tobias Haug, John Preskill +1 more·Aug 24, 2026
Thermalization conventionally describes local properties of isolated many-body systems at equilibrium. Magic, or nonstabilizerness $\unicode{x2013}$ the resource enabling universal quantum computation $\unicode{x2013}$ is by contrast encoded in the g...
Importance-Reweighted Fock-Space Variational Monte Carlo
Zheng Che·Aug 24, 2026
Fock-space variational Monte Carlo (FS-VMC) evaluates variational quantities by stochastic sampling over discrete many-body configurations. For ab initio electronic Hamiltonians, Born distributions can differ markedly between systems, and a Markov ch...
Geometric Phases of a Driven Qubit: Comparing Berry and Uhlmann Holonomies
Hyeonseok Yang, Changsuk Noh·Aug 24, 2026
The Berry phase arises naturally from the adiabatic dynamics of a pure quantum state, whereas the Uhlmann phase is usually formulated kinematically for a prescribed path of mixed states. For a qubit subject to a uniformly gapped conical drive, we obt...
Deterministic Preparation of Arbitrary Spin Eigenfunctions
Wenxuan Tao, Jianan Wang, Fen Zuo·Aug 24, 2026
Quantum states with conserved total spins, or spin eigenfunctions, are important for studying quantum chemistry and quantum manybody physics problems. A typical class of spin eigenfunctions are Dicke states, which attain maximal spins. While we alrea...
Implementation of nonlocal multi-photon interference by mode swapping
Holger F. Hofmann, Yuki Kodama, Jonte R. Hance·Aug 24, 2026
Multi-photon interference can be observed using independently generated photons as input. In the most simple case, these photons meet up at a beam splitter, resulting in quantum interference between transmission and reflection of the photons. Here, w...
Numerical Evaluation of ZX Calculus Optimization for Solovay Kitaev Quantum Circuit Synthesis
Dulari De Silva, Anuradha Mahasinghe, Chon-Fai Kam +3 more·Aug 24, 2026
Fault-tolerant architectures implement non-Clifford T gates through magic-state distillation, so the T-count of a synthesized circuit dominates its physical cost. The Solovay-Kitaev algorithm approximates any single-qubit unitary from a finite gate s...
An Exactness Barrier for ZX-Calculus Optimization of Synthesized Clifford+T Circuits
Chon-Fai Kam, Anuradha Mahasinghe, Kaushika De Silva +2 more·Aug 24, 2026
Gate synthesis and circuit optimization are usually studied separately, and evidence on their interaction is contradictory: ZX-calculus rewriting removes a stable fraction of Solovay-Kitaev circuits, yet almost nothing from number-theoretically synth...
Classical and quantum spectral density estimation under local graph access
Rong-Hua Li, Meihao Liao, Yichun Yang·Aug 24, 2026
We study spectral density estimation for the normalized adjacency matrix of an unweighted graph under local access model. Previously, Cohen-Steiner et al. [KDD 2018] proposed an algorithm for $\varepsilon$-approximate spectral density estimation in t...
A Process-Aware Hybrid Si/IGO Monolithic-3D 6T SRAM with BEOL Pass-Gates for the 2nm Node
Po-Chuan Wang, Dongwon Jang, Eknath Sarkar +5 more·Aug 24, 2026
We propose a monolithic-3D (M3D) 6T SRAM at the 2nm node, integrating BEOL IGO pass-gates (PGs) with an all-silicon nanosheet latch, buried power rails (BPRs), and Ru interconnects. TCAD calibrated to a state-of-the-art double-gate IGO transistor wit...
Does Probability Require a Single History?
Jonathan Baxter·Aug 24, 2026
Everettian quantum mechanics is often said to lack coherent probability because every possible measurement result occurs. If all of them exist globally, what is probability supposed to be a probability of? This paper defends an axiomatic answer: norm...
Chiral doublon bound states in a synthetic topological waveguide
Ying Xia, Xin Wang·Aug 24, 2026
Nonlinear waveguide QED serves as a platform for studying correlated photon dynamics, where its interplay with topological bound states can give rise to unconventional phenomena. We investigate a triangular ladder waveguide in which a pair of emitter...
Quantifying Multipartite Entanglement Based on unified entropy
Yan Hong, Tongtong Xu, Limin Gao·Aug 24, 2026
In this paper, we investigate the characterization of multipartite entanglement based on the unified $(q,s)$-entropy framework. For bipartite quantum states, we propose an entanglement measure $E_{q,s}^{A|B}(ρ)$ based on unified entropy and derive se...
Fock-state filtering of squeezed states: enhanced nonclassicality and effects of a thermal bath
João Pedro González de Oliveira, A. Vidiella-Barranco·Aug 24, 2026
The ability to tailor photon-number statistics is central to the generation and control of nonclassical states of light. Here, we investigate how Fock-state filtering of squeezed coherent states can be used to engineer their photon statistics. We con...
Time-Resolved Edge Flux on the SU(3) Triangle: A Cooperative-Decay Graph Framework with Exact Bateman Solutions
Gombojav O Ariunbold, Vaidyanathan Sivaraman·Aug 24, 2026
Cooperative emission from three-level ensembles is conventionally diagnosed through the radiated intensity alone, which cannot say which channels carry the photons at each instant. We promote every transition of the cooperative-decay graph into a tim...
A Margolus-Levitin speed limit for observables: mean energy bounds expectation-value change quadratically
Bryan Nasr·Aug 23, 2026
The Mandelstam-Tamm and Margolus-Levitin quantum speed limits bound how fast a state evolves, using the energy variance and the mean energy above the ground state. Speed limits on observables -- the change of an expectation value <A(t)> -- have so fa...