Local and Global Risk Bounds for Quantum Entropy Estimation under Projective-Design MeasurementsWe establish a lower bound for estimating the von Neumann entropy from independent outcomes of any fixed rank-one POVM. A rotation-averaged van Trees argument gives a global minimax risk of at least…Xinyu Song·Aug 25, 2026SaveLearn
Energy-Constrained Commutator Variance for Weyl PairsLet W be a representation of the Weyl relations on a separable Hilbert space and write RW(K)=\W(f):f∈ K\''. If the symplectic pairing of K1 and K2 is nonzero, there is…Hassan Nasreddine·Aug 25, 2026SaveLearn
Holomorphic Quantum Error Correction CodesWe develop a holomorphic representation of quantum error correction codes (QECCs) within the Segal--Bargmann space. By encoding qubits into Schwinger boson modes (zaj, zbj) subject to a…M. W. AlMasri·Aug 25, 2026SaveLearn
Femtoscopic Correlation Functions in Density Operator RepresentationFemtoscopic correlation functions (CFs) have been increasingly used to extract strong interactions between pairs of unstable particles, but their physical soundness has recently been questioned. To…Hao-Nan Liu, Duo-Lun Ge, Zhi-Wei Liu et al.·Aug 25, 2026SaveLearn
Multipair-resilient entanglement swapping with complementary linear-optical measurementsMultipair emission is a principal source of false heralds in entanglement swapping with spontaneous parametric down-conversion sources. A conventional Bell-state measurement (BSM) cannot distinguish…Siavash Mirzaei Ghormish, Ryan M. Camacho·Aug 25, 2026SaveLearn
Separating Quantum Indistinguishability Obfuscation from Falsifiable AssumptionsQuantum indistinguishability obfuscation (qIO) aims to make a quantum circuit unintelligible while preserving its functionality. It serves as a foundational primitive for advanced applications, such…Mohammed Barhoush, Tomoyuki Morimae, Ramis Movassagh·Aug 25, 2026SaveLearn
Optical centrifuge as a probe of strong dissipative coupling between a molecular rotor and superfluid heliumA macroscopic manifestation of superfluidity is that objects moving through liquid helium experience negligible friction below the Landau critical velocity. How this frictionless motion breaks down…Ian MacPhail-Bartley, Sören E. Mahr, Cameron E. Peters et al.·Aug 25, 2026SaveLearn
No Free Compression in Quantum Relaxations for OptimizationQubit-efficient quantum relaxations compress classical decision variables into expectation values on substantially fewer qubits. We ask what resource tradeoffs this compression entails for quantum…Stuart Hadfield·Aug 25, 2026SaveLearn
Generalized Efficient Quantum Circuit Implementation of Discrete-Time Quantum Walks on Cayley GraphsWe present a generalized and efficient quantum circuit framework for implementing discrete-time quantum walks (DTQWs) on Cayley graphs of arbitrary dimension. Building on the Boundary QFT scheme of…Seoyoon Kang·Aug 25, 2026SaveLearn
Feedback-enabled magnomechanics in lithium ferriteLithium ferrite (LiFe) is a promising material for cavity magnonics because its large spin density enables strong coupling between magnons and microwave photons. Its potential for cavity…Mehri Ebrahimi, Yunhu Huang, Ali Rashedi et al.·Aug 25, 2026SaveLearn
A Unified Framework for Operator Backpropagation and Observable Measurement in Quantum ComputingDecoherence imposes severe limits on quantum circuit depth, motivating methods to reduce circuit depth. Operator backpropagation has recently been proposed as a way to lower circuit depth by…Kevin Dougherty, Ji Liu·Aug 25, 2026SaveLearn
Real-time decoder for a MegaQuOp quantum computer using a single CPUAs quantum computers advance toward the regime of MegaQuOp machines executing millions of gates, a decoding system capable of real-time error correction in such a device will be crucial. Recent…Min Ye, Andrii Maksymov, Nicolas Delfosse·Aug 25, 2026SaveLearn
Hardware-Aware Fermion-to-Qubit Mappings for Simulating the 2D Hubbard Model on Heavy-Hexagon Quantum ProcessorsQuantum simulation of strongly correlated fermionic systems is among the most promising near- term applications of quantum computing, but its practical efficiency depends critically on the choice of…Alessio Esposito, Andrea Giachero, Zoltàn Zimboràs et al.·Aug 25, 2026SaveLearn
The bottleneck dimension of quantum operationsProgrammable quantum devices nominally act on a Hilbert space whose dimension grows exponentially with the number of constituents, but the presence of noise makes it unlikely that they remain…Pavel Sekatski·Aug 25, 2026SaveLearn
Fluctuation-dissipation structure of quantum geometryThe geometry of quantum states is a fundamental research area with applications ranging from band theory in condensed matter to variational algorithms in quantum information. Due to their relative…Per Moosavi·Aug 25, 2026SaveLearn
Mixed-State Symmetry-Protected Topology and Strong-to-Weak Spontaneous Symmetry Breaking in a Superconducting Qubit ArrayWe experimentally investigate how symmetry-protected topological order in a one-dimensional cluster state is transformed by measurement and decoherence in a five-qubit superconducting array. We first…Qian Cao, Zhen Bi, Kater W. Murch·Aug 25, 2026SaveLearn
Observing Bell Inequality Violation Beyond the Qubit Bound in a Spinor Bose--Einstein CondensateCorrelations allowed by quantum mechanics can defy any classical explanation, with Bell nonlocality standing as their most profound and operationally powerful manifestation. While nonlocality has…Wenxin Xu, Junshuang Hu, Guillem Müller-Rigat et al.·Aug 25, 2026SaveLearn
Certified Randomness without Structure Against Shallow-Query AdversariesIn a recent breakthrough, Yamakawa and Zhandry (J. ACM 2024) constructed a proof of quantumness in the quantum random oracle model (QROM) in which the quantum prover samples a codeword preimage of a…Dakshita Khurana, Bhaskar Roberts, Avishay Tal·Aug 25, 2026SaveLearn
Masked Differential-linear Distinguishers and Quantum ApproachesWe introduce masked auto-correlation, a new primitive for the cryptanalysis of symmetric-key primitives, together with a quantum attack pipeline built on it. For a permutation f, output masks…Shobhit Pandey, Sarbani Sen, Debajyoti Bera et al.·Aug 25, 2026SaveLearn
Geometry-controlled correlated electric-field noise in enclosed ion traps from billiard return spectraWe ask how passive conducting geometry determines the spatial structure of electric-field noise seen by trapped ions. From a boundary-potential covariance and the Dirichlet Green function we…Ayush Nadiger·Aug 25, 2026SaveLearn
Certified Fidelity Susceptibility from Classical ShadowsFidelity susceptibility is a useful probe of quantum phase transitions and quantum metrology, but its direct evaluation on a quantum device is challenging. By integrating Krylov-subspace methods with…Kiran Adhikari·Aug 25, 2026SaveLearn
Towards Optimal Quantum Estimators for State Frame PotentialThe state frame potential is a standard diagnostic of how closely a quantum state ensemble approximates Haar randomness. In this work, we study the problem of estimating the state frame potential of…Jinge Bao, Wang Fang, Yoshifumi Nakata et al.·Aug 25, 2026SaveLearn
When Similarity Is Interaction-Driven: Quantum Kernels for Regime-Sensitive LearningSimilarity in many decision systems is governed not by distance alone but by interactions among variables. In fraud and anomaly detection, small local perturbations can cross interaction-sensitive…Hanqiu Peng, Jianlong Lu, Ying Chen·Aug 25, 2026SaveLearn
Quantum Change Interval: Exact Asymptotics for Minimum Error LocalizationWe study a returning quantum change interval in which a source emits ψ over one interval and 0 elsewhere. A collective measurement on the full sequence identifies both…Xu Chen, Xue Ma·Aug 25, 2026SaveLearn
Provable Quantum--Classical Separation for Continuous Gibbs SamplingWe prove the first quantum--classical separation for a sampling problem over a continuous domain. For a class of Gibbs states p e-βE on the torus Td with smooth (s-Gevrey)…Enrico Olivucci, Mariia Sobchuk, Sehmimul Hoque et al.·Aug 25, 2026SaveLearn