The Norton Theorem for Quantum Circuits and SystemsIt is well known that classical analog circuits and systems benefit from the powerful Thevenin and Norton theorems. These theorems enable rigorous and exact mathematical simplification and…Anthony J. Cressman, Rahul Sarpeshkar·Jul 17, 2026SaveLearn
Hamiltonian Lift of Bures--Wasserstein Covariance Dynamics with a Spectral FloorCovariance dynamics on the positive-definite cone are commonly described by gradient flows, which encode dissipative relaxation but obscure the underlying phase-space structure. We construct a…Christian Kerskens·Jul 17, 2026SaveLearn
The Killing Form and Petz Uniqueness of Gaussian Bures GeometryFor centered bosonic Gaussian states, the covariance pullback of the Bures cometric differs from the lift-normalized classical covariance Fisher--Rao cometric by a state-independent bilinear form.…Christian Kerskens·Jul 17, 2026SaveLearn
Reverse engineering of single-qubit quantum gatesIn this work, we address the problem of designing single-qubit quantum gates by means of a linearly-polarized field. We show that any desired one-qubit gate corresponding to a special unitary matrix…Gustavo Fernandes da Costa, Leonardo K. Castelano, Emanuel Fernandes de Lima·Jul 17, 2026SaveLearn
Quantum-classical crossover in fault-tolerant quantum dynamics simulationWhile quantum computers promise to solve classically intractable problems, identifying the point at which fault-tolerant quantum computation outperforms the best classical algorithms for practical…Jinzhao Sun, Bozhen Zhou, Jue Xu et al.·Jul 17, 2026SaveLearn
Object-relative ultraviolet weighting of electromagnetic modes and one-loop ultraviolet finiteness in quantum electrodynamicsThis work explores whether localized electromagnetic interactions can be modeled in terms of an effective object-relative ultraviolet weighting of internal modes. The proposal is motivated…Christian Rembe·Jul 17, 2026SaveLearn
Operator Entanglement in Quantum Dynamics Simulations: Formalism and Analysis ToolsWe review the framework of operator Hilbert space and introduce the one- and two-particle super reduced density matrices (1-SRDMs and 2-SRDMs), as well as the super mutual information (SMI). The…Tzu Yu Wang, Michael Schuurman, Simon Neville·Jul 17, 2026SaveLearn
Rigorous Time-dependent Hamiltonian Learning via Continuous Weak MeasurementsCharacterizing the Hamiltonian that a quantum processor actually implements is central to calibrating and validating current quantum hardware. Many devices, however, operate with generators that are…Jesús Jiménez-Rodríguez, Giacomo Franceschetto, Antonio Acín et al.·Jul 17, 2026SaveLearn
Rethinking Quantum Continual Learning with Quantum Fisher InformationQuantum continual learning aims to train quantum models on sequential tasks without losing previously learned knowledge. However, variational quantum classifiers (VQCs) are prone to catastrophic…Yu-Chao Hsu, Yu-Cheng Lin, Tai-Yue Li et al.·Jul 17, 2026SaveLearn
Quantum Mechanics on Lie Groups: II. Path IntegralsWe continue our study of quantum dynamics on a Lie group G, initiated in arXiv:2512.19840, by building the path integral that governs transition amplitudes in the Hilbert space L2(G). This…Mathieu Beauvillain, Blagoje Oblak, Marios Petropoulos·Jul 17, 2026SaveLearn
Tunable Families of Multiqubit Elegant Joint MeasurementsWe give a closed-form construction of the n-qubit Elegant Joint Measurement (EJM) proposed in [PRL 136, 190201 (2026)] and show that it is part of a tunable family of measurements with…Jef Pauwels, Nicolas Gisin·Jul 17, 2026SaveLearn
Parameter Estimation in a Continuously Monitored Non-Markovian Quantum SystemContinuous monitoring is a powerful tool for analyzing quantum systems and is increasingly used as a non-demolition technique in quantum metrology. In this context, noisy data acquired through…Erik L. André, Pharnam Bakhshinezhad, Patrick P. Potts et al.·Jul 17, 2026SaveLearn
Conditional Euclidean-Hamiltonian reductions for sign-problem toy modelsEuclidean Monte Carlo methods are effective when the path-integral weight is real and nonnegative, but finite-density fermion systems often produce sign-changing or complex scalar weights after the…Tsogtgerel Gantumur·Jul 17, 2026SaveLearn
Beyond the Positive Partial Transpose Squared Conjecture: The Qutrit CaseEntanglement swapping is a fundamental operation in quantum repeaters for establishing entanglement between distant parties. The positive partial transpose (PPT) squared conjecture asks whether two…Junhyeong An, Soojoon Lee·Jul 17, 2026SaveLearn
Optimization of multistate STIRAP by pulse shapingWe propose a pulse-shaping method for improving population transfer in multistate stimulated Raman adiabatic passage (STIRAP) with nearest-neighbour couplings only. The method extends the…Julian K. Dimitrov, Nikolay V. Vitanov·Jul 17, 2026SaveLearn
Reconstruction of the noise correlation spectral density from the cavity emission in a two-qubit systemA significant challenge in the field of large-scale fault-tolerant quantum computation is the influence of noise. In addition to the influence of noise on individual qubits, the smaller additional…Nadine Lenke, Guido Burkard·Jul 17, 2026SaveLearn
Alleviating the Sparse Matrix Scaling Bottleneck in Adaptive VQE via Greedy Operator Commutativity Partitioning and High-Order Taylor State EvolutionThe Variational Quantum Eigensolver (VQE) and its adaptive variants, such as ADAPT-VQE, are central to the study of strongly correlated quantum systems. However, the classical simulation of the…Hermawan Kresno Dipojono·Jul 17, 2026SaveLearn
The statistical disturbance bound of quantum measurementsQuantifying the disturbance caused by a quantum measurement typically requires detailed knowledge of the underlying measurement channel. In this work, we introduce a statistical disturbance bound,…Ties-A. Ohst, Sebastian Schlösser, Roope Uola·Jul 17, 2026SaveLearn
Maximal quantum leakage: operational interpretation and quantum channel analysisMaximal quantum leakage quantifies privacy against adversaries with arbitrary intentions. In this work, we prove that computing this leakage is equivalent to minimum-error quantum state…Shuixin Xiao, Zijia Zhao, Jingge Zhu et al.·Jul 17, 2026SaveLearn
The Fourier Wall: Why Public Tabular Datasets Refuse Quantum Advantage, and a Certified Recipe for Where It LivesAcross public tabular benchmarks, quantum machine-learning (QML) models usually lose to carefully tuned classical baselines. We argue that this is a structural property of the datasets rather than…Javier Mancilla, Tomás Tagliani·Jul 17, 2026SaveLearn
Manipulating non-intrinsic outputs of a non-Hermitian coupled system by weak external drivingMeasurement provides access to exploring and understanding nature and finds widespread applications. It is generally believed that the weak external driving used in measurement introduces negligible…He Feng, Yi-Fan Xiang, Wei Li et al.·Jul 17, 2026SaveLearn
Grover's algorithm for image edge detectionGrover's algorithm is one of the most significant quantum algorithms, enabling the search for a marked element in an unsorted database quadratically faster than classical search algorithms. We…Pulak Ranjan Giri, Kazuhiro Saito·Jul 17, 2026SaveLearn
Non-Gaussianity in cat codes: global incompatibility and local geometric alignment with the magic resourceNon-Gaussianity is an essential resource for genuine quantum advantages in continuous-variable quantum systems and is regarded as a counterpart of the magic resource in discrete-variable systems.…Yuwei Zhu, Seungbeom Chin, William J. Munro et al.·Jul 17, 2026SaveLearn
Spectral Attack on Continuous-Variable Quantum Key Distribution SystemsContinuous-variable quantum key distribution (CVQKD) has attracted extensive attention due to its compatibility and low costs. However, bandwidth mismatch exists to varying degrees between the…Chen Gong, Mingxuan Guo, Peng Huang et al.·Jul 17, 2026SaveLearn
Fate of dynamical quantum phase transitions from sudden quench to slow quench limitPrevious investigations of dynamical quantum phase transition (DQPT) have predominantly focused on sudden quench protocols. In this work, we systematically explore the fate of DQPT from the sudden to…Xiang Zhang, Fuxiang Li·Jul 17, 2026SaveLearn