Parametric amplification in a Kerr Oscillator based on Ne FIB NanobridgesSuperconducting circuits play a crucial role in the advancement of quantum computing and quantum sensing. Typically such circuits require the presence of a non-linear element, where the engineered…Parth Bhandari, Laith Meti, Gemma Chapman et al.·Aug 29, 2026SaveLearn
Quantum optomechanics with arbitrary mirror displacement: nonlinear Langevin equation with non-Markovian back-action noisesQuantum optomechanics (QOM) explores the interaction between a quantum field, often confined in a cavity, and the quantum motion of mirrors, membranes or material media, usually assumed slow enough…Adrian E. Rubio Lopez, Hing-Tong Cho, Bei-Lok Hu·Aug 29, 2026SaveLearn
The ZZ feature map induces a signless Laplacian metric: a closed-form classical surrogate for quantum kernel regressionQuantum kernel methods lose their advantage over classical kernels once the encoding bandwidth is tuned, and bandwidth-tuned quantum kernels have been shown to resemble radial basis function kernels…Erkut Tekeli·Aug 29, 2026SaveLearn
FIREQ: FPGA Instrumentation for Readout and Qubit controlWe present FIREQ (FPGA Instrumentation for Readout and Qubit control), an open-source RFSoC-based framework for the control and readout of superconducting qubits. FIREQ combines a modular…Giuseppe La Capra, Fabio Calabrese, Giorgio D'Amico et al.·Aug 29, 2026SaveLearn
Quantum work extraction from partial information and with finite resourcesInformation can be converted into work, but in quantum mechanics information about a state is not freely available: it must be inferred statistically from measurements on a finite number of copies.…Giacomo Guarnieri, Diego Maragnano, Giulia Gamba et al.·Aug 29, 2026SaveLearn
Convex conservation of von Neumann entropy implies unitarity or antiunitarityOn the space of density matrices D(H), Kadison's theorem establishes that all invertible convex transformations K:D(H) D(H) are unitarity or antiunitary. For a finite Hilbert space, we…Nicolas G. Underwood, Jonte R. Hance·Aug 29, 2026SaveLearn
Spinor Structure and Quantum Mechanics from Relativistic Mass-Shell Factorisation in Phase SpaceSpinor structure is usually introduced as part of relativistic quantum theory. We show that its underlying algebra can instead emerge without quantisation from a covariant statistical description of…Mark Everitt·Aug 29, 2026SaveLearn
Quantum Natural Gradient on Quotient SpacesA parametrized quantum circuit reports its state geometry through a quantum Fisher information matrix (QFIM), often singular. A small Fisher value can reflect exact state-preserving redundancy,…Zeyu Chen·Aug 29, 2026SaveLearn
Zero-Energy Problems for Supersymmetric Hamiltonians on a Chain Are QMA1-CompleteWe study exact zero modes of supersymmetric quantum systems whose interactions are arranged on a one-dimensional chain. For Hermitian supercharges, deciding whether a zero mode exists is…Yibin Wang·Aug 29, 2026SaveLearn
Anomalous Frequency Shift in Low-Loss Superconducting Granular Aluminum ResonatorsSuperconducting high-kinetic inductance materials like granular aluminum (grAl) are a versatile part of the circuit quantum electrodynamics (cQED) toolbox, provided their losses at microwave…Patrick Winkel, Daniil S. Antonenko, Vishakha Gupta et al.·Aug 29, 2026SaveLearn
Fully integrated continuous-variable quantum key distribution with composable security over 100 kmQuantum key distribution (QKD) guarantees information-theoretic security by the laws of physics, but deployment at scale requires compact, manufacturable photonic terminals. Continuous-variable QKD…Yankai Xu, Xinhang Li, Tao Wang et al.·Aug 29, 2026SaveLearn
Second harmonic phase locking and synchronization blockade in quadratically coupled driven quantum van der Pol oscillatorsWe investigate the dynamics of a quadratically coupled system under the influence of an external drive applied to the second oscillator, where the coupling facilitates a high-order synchronization…Nissi Thomas, M. Senthilvelan·Aug 29, 2026SaveLearn
Probabilistic generation of two-mode binomial cat states using cross-Kerr interactionsSuperpositions of macroscopically distinct coherent states, or cat states, are a key resource for quantum technologies. In particular, two-mode binomial cat states can give rise to exact quantum…S. Zhao, A. Metelmann, S. Qvarfort·Aug 29, 2026SaveLearn
Quantum discord of Gaussian states in non-inertial framesWe investigate the redistribution of continuous-variable Gaussian quantum discord under the Unruh effect for both one and two uniformly accelerated observers. The discord shared between the inertial…Siwei Li, Xiaofen Huang·Aug 29, 2026SaveLearn
The Inverse Eigenvalue Problem for Partial Transposes of Two-Qubit StatesFor a bipartite state ρ, information about the spectrum of its partial transpose ρΓB can be inferred from measurements on multiple copies of ρ, without full state tomography. This raises a…Ruoting Dou, Shengjun Wu, Zeng-Bing Chen·Aug 29, 2026SaveLearn
Eigenvalues of multipartite entanglement witnessesWe investigate various properties of multipartite block-positive operators, decomposable EWs (DEWs), and non-decomposable EWs. We provide a necessary and sufficient condition to construct a special…Nalan Wang, Lin Chen·Aug 29, 2026SaveLearn
Hardware-Efficient Exchange-Only QML: Singlet-Triplet Spin Chains via Inter-pair Coupling without Magnetic GradientsStandard universal quantum computing using exchange-only qubits typically requires three physical spins per logical qubit, leading to significant hardware overhead. Conversely, two-spin units offer…Yuichiro Minato·Aug 29, 2026SaveLearn
Measure of set imaginarityRecent studies have shown that Bargmann invariants provide effective detectors of set imaginarity. In this paper, we investigate set imaginarity as a quantum resource in qubit systems. By exploiting…Yu Guo, Jiabo Pan, Yuqin Wang et al.·Aug 29, 2026SaveLearn
Universal recovery in approximate quantum error correctionUniversal recovery -- the existence of a single recovery map that corrects an entire family of error channels -- is a central feature of quantum error correction (QEC). In exact QEC, linearity…Dor Elimelech, Victor V. Albert, Alexander Barg·Aug 29, 2026SaveLearn
Physics-Informed Classical and Quantum Neural Networks for One-Dimensional Schrodinger Eigenvalue ProblemsThe Schrodinger equation in one spatial dimension admits a small set of exactly solvable potentials that serve as natural proving grounds for any new eigenvalue solver. We formulate Physics-Informed…Tariq Mahmood, Waqas Arshad, Bilal Naseer et al.·Aug 28, 2026SaveLearn
On the entropy of a pseudo-density matrixThe pseudo-density matrix (PDM) formalism naturally extends the notion of density operator to the spatiotemporal domain. While PDMs are Hermitian and of unit trace, they admit negative eigenvalues…James Fullwood, Boyu Yang·Aug 28, 2026SaveLearn
Exact Haar Statistics of Planar k-Purity in Multipartite Quantum SystemsPlanar k-uniform states have maximally mixed reductions on every k-site interval of a ring. We introduce planar k-purity---the mean purity of those intervals---as a faithful cost function for…Kourosh Mirsohi·Aug 28, 2026SaveLearn
Spin-spin effects from non-relativistic limit of Dirac-Pauli-Maxwell LagrangianIt is natural to expect that the electromagnetic spin-spin interaction has roots in a more fundamental theory: quantum electrodynamics in this case. To show this, we take the non-relativistic limit…Radmehr Fathi, Nima Khosravi·Aug 28, 2026SaveLearn
Rényi Entanglement of Purification Is Non-additiveEntanglement of purification is a fundamental measure of total correlations whose additivity remains unresolved. We study its additivity for classical states on two qubits at different Rényi orders.…Amir-Reza Negari, Zahra Baghali Khanian·Aug 28, 2026SaveLearn
Quantum Preconditioning For Constrained Optimization ProblemsWe study the effect of quantum preconditioning on constrained combinatorial optimization problems, focusing on balanced graph bi-partitioning. The proposed approach uses two-point correlations…Anurag Ramesh, Bhuvanesh Sundar, Maxime Dupont et al.·Aug 28, 2026SaveLearn