Near-Optimal Learning of Quantum Many-Body Systems from Gibbs and Thermal Metastable States via the Stationarity TestWe study the problem of learning a finite-range quantum Hamiltonian on an n-qubit D-dimensional lattice from copies of its Gibbs states at a known inverse temperature β or its thermal…Tai Hsuan Yang·Nov 1, 2026SaveLearn
Purity maxima, absolute separability, and spectral volumes of absolutely PPT statesFor m n systems with n m3, we determine the exact maximum purity of absolutely positive partial transpose (APPT) states and the unique maximizing ordered spectrum when n2m2-4…Anh T. Tran·Nov 1, 2026SaveLearn
Boson sampling is fragile to lossBoson sampling experiments aim to demonstrate quantum computational advantage with increasing numbers of interfering photons. A central question is whether their computational hardness survives under…Youngrong Lim·Nov 1, 2026SaveLearn
A GPU-Accelerated and Geometry-Aware Quantum-Classical Framework for Optimized PES Scans with CUDA-QHybrid quantum-classical workloads, particularly Potential Energy Surface (PES) scans in quantum chemistry using batched VQE and QAOA, involve many structurally similar Hamiltonians differing only in…Panayiotis Christou, Shuwen Kan, Ying Mao·Nov 1, 2026SaveLearn
Logical-Class Diagnostic Layer for Stabilizer Codes and Decoders via Supercharge StructuresWe develop a decoder-agnostic logical-class diagnostic layer for abelian Pauli stabilizer codes, motivated by fault-tolerant quantum computing. An ancilla fermionic register defines a nilpotent…Hai Lin·Oct 31, 2026SaveLearn
Theoretical estimation of nonlinear response function and ultrafast optical spectroscopy of nitrogen vacancy centersThe theoretical description of the ultrafast optical response of nitrogen-vacancy centers has traditionally been developed using the nonlinear response function formalism based on a displaced…Arunangshu Debnath·Oct 31, 2026SaveLearn
Floquet engineering of quantum relaxationDynamical decoupling suppresses decoherence by averaging selected interactions between a quantum system and its environment. Here, we extend this notion through a general Floquet formalism that maps…Kang Xu, Dionisio Cendoya, Nazar Delegan et al.·Oct 31, 2026SaveLearn
Hidden selection rules and amplitude ceilings in quantum Fourier modelsQuantum models with Pauli data encodings compute trigonometric polynomials whatever channels, ancillas and outcome-averaged measurements follow, so their expressivity depends on the Fourier…Pavel Sulimov, Claude Lehmann·Oct 31, 2026SaveLearn
Maximum purity of absolutely separable and absolutely PPT states in qutrit--qudit systemsA bipartite state is absolutely positive partial transpose (APPT) if it remains PPT under every global unitary transformation, and absolutely separable if it remains separable. For every…Anh T. Tran·Oct 31, 2026SaveLearn
Model-Based Fast Calibration for a Nitrogen Vacancy Center QPUWe present a simulation-informed calibration workflow for NV quantum processing units that combines a digital twin, optimal control pulses, and a Fisher-information-guided experiment design into an…Tobias F. Sjolander, Marco Rossignolo, Lorena C. Bianchet et al.·Oct 31, 2026SaveLearn
Chaos, Fractals, and Ergodicity in Nonlinear Quantum ProtocolsIterated nonlinear quantum protocols provide a straightforward way of realizing nonlinear dynamics in quantum systems through measurement and postselection. We investigate a family of protocols in…Attila Portik, Orsolya Kálmán, Tamás Kiss·Oct 31, 2026SaveLearn
Persistence of Fractal Structures in Iterated Quantum Protocols: Robustness to Preparation and Gate ErrorsRepeatedly combining entangling gates on an ensemble of qubits with measurement and postselection on a part of them induces a nonlinear evolution of the unmeasured qubits' state, whose fractal…Attila Portik, Orsolya Kálmán, Tamás Kiss·Oct 31, 2026SaveLearn
Cooling-path-selected self-assembly of telecom InAsP quantum dotsEpitaxial quantum dots are leading solid-state sources of quantum light, but reproducible growth on indium phosphide (InP) remains challenging because dot-formation windows are narrow and emission…Yiteng Zhang, Doaa Abdelbarey, Markus Etzkorn et al.·Oct 31, 2026SaveLearn
Pump-scheme dependence of few-emitter lasers: exact multilevel correlations and photon statisticsFew-emitter laser models usually replace the excitation cycle of the gain medium by a single Markovian pump jump of a two-level emitter. We test this replacement with the cavity and laser-transition…Stephan Hartmann·Oct 31, 2026SaveLearn
All-to-All Connectivity in Superconducting Qubits via Metamaterial-Mediated InteractionsWe show that encoding superconducting qubits as dual-rail or spin-locked transmons lets a metamaterial waveguide couple them all-to-all while suppressing the spurious entanglement that burdens…Or Golan, Alexey V. Gorshkov, Andreas Butler et al.·Oct 31, 2026SaveLearn
On Estimating Quantum Divergences with p-Power MeansWe study the problem of estimating the quantum divergence with p-power means, Φp(ρ\,\|\,σ). This quantity was investigated by Lam and Le (Linear Algebra Appl.\ 2021). For any constant…Jinge Bao, Minbo Gao, Qisheng Wang·Oct 31, 2026SaveLearn
Optimally Weighted Constrained Shadow Tomography for Reduced Density MatricesAccurate measurement of reduced density matrices (RDMs) is central to quantum simulations of many-fermion systems, but the required measurement resources remain a significant challenge. Constrained…Yuchen Wang, Irma Avdic, Michael Rose et al.·Oct 31, 2026SaveLearn
Multiparameter quantum metrology for general and adaptive strategiesWe develop a conic-programming framework for multiparameter estimation of quantum processes under different classes of sensing strategies. Estimation precision depends on the choice of input probe…Masahito Hayashi, Yingkai Ouyang·Oct 31, 2026SaveLearn
Normal Factor Graph Representations of Stabilizer Quantum Codes with ApplicationsWe develop normal factor graph (NFG) representations of stabilizer quantum error-correcting codes and entanglement-assisted quantum error-correcting codes. We introduce two complementary…July X. Li, Pascal O. Vontobel·Oct 31, 2026SaveLearn
Single-Mode Squeezing Using Degenerate Four-Wave Mixing in a Dual-Pump TWPASingle-mode squeezing of the electromagnetic vacuum is a key resource for mode-selective noise reduction in quantum measurements. At microwave frequencies, single-mode squeezing is typically obtained…Anna Levochkina, Kirill Petrovnin, Iiro Harju et al.·Oct 31, 2026SaveLearn
Binary Quantum Hypothesis Testing with a Rejection Option: The Exact Error-Exponent Trade-offWe characterize the exact error-exponent trade-off in binary quantum hypothesis testing with a rejection option for faithful states on a finite-dimensional Hilbert space. The probabilities of…Yonglong Li·Oct 31, 2026SaveLearn
Quantum Mpemba effect of Z2 symmetry restoration in the Dicke modelWe study a symmetry-restoration quantum Mpemba effect in the dissipative Dicke model as an example of a weakly Z2-symmetric open quantum system, where the full Liouvillian is parity…Dongni Chen, Wei Xiong, Peng-Cheng Li et al.·Oct 31, 2026SaveLearn
Where Does a Variational Quantum Classifier Lose Accuracy? Angle Encoding, Readout and the Fidelity-Kernel Reference in Cyberattack DetectionWhen a variational quantum classifier performs poorly at detecting network attacks, it is hard to tell which part is to blame: the encoding, the trained circuit or the readout, which turns…Angelos Thomos, Theodore Andronikos·Oct 31, 2026SaveLearn
Experimental Realization of a Nonreciprocal Quantum BatteryQuantum batteries promise faster and more efficient energy storage and extraction by harnessing quantum mechanics, serving as essential building blocks for future quantum devices. A key practical…Jie Zhang, Xin-Sheng Chen, Ruo Kun Cai et al.·Oct 31, 2026SaveLearn
Multicopy teleportation and quantum program retrieval on superconducting quantum hardwareCorrection-free teleportation protocols offer a probabilistic route around the limits imposed by the quantum no-programming theorem, but have remained largely theoretical. Here, we experimentally…Yousef Mafi, Ali G. Moghaddam·Oct 31, 2026SaveLearn