quant-ph papers | Gist.Science

A Mutual Information-based Metric for Temporal Expressivity and Trainability Estimation in Quantum Policy Gradient Pipelines

This paper proposes a mutual information-based metric called MI-TET to quantify temporal expressivity and trainability in quantum policy gradient pipelines, demonstrating that the mutual information between action distributions and discretized rewards provides an upper bound for gradient norms and enables a prescreening criterion for initialization-time gradient fragility.

Jaehun Jeong, Donghwa Ji, Kabgyun Jeong2026-03-10⚛️ quant-ph

Hybrid quantum-classical matrix-product state and Lanczos methods for electron-phonon systems with strong electronic correlations: Application to disordered systems coupled to Einstein phonons

This paper introduces and benchmarks two hybrid quantum-classical methods combining time-dependent Lanczos and matrix-product state approaches with the multi-trajectory Ehrenfest approximation to simulate electron-phonon systems, demonstrating that coupling strongly disordered interacting fermions to classical Einstein phonons induces delocalization and destabilizes many-body localization.

Heiko Georg Menzler, Suman Mondal, Fabian Heidrich-Meisner2026-03-10⚛️ quant-ph

Q-BAR: Blogger Anomaly Recognition via Quantum-enhanced Manifold Learning

The paper proposes Q-BAR, a hybrid quantum-classical framework that utilizes parameter-efficient variational quantum circuits to detect semantic mutations in online media by modeling creator-specific manifolds, effectively overcoming data scarcity challenges where traditional deep learning models typically fail.

Maida Wang, Panyun Jiang2026-03-10⚛️ quant-ph

Exact and Tunable Quantum Krylov Subspaces via Unitary Decomposition

This paper introduces Quantum Krylov using Unitary Decomposition (QKUD), a time-evolution-free method that maps Hamiltonian powers to implementable unitaries via a tunable Hermitian transform to overcome basis collapse and ill-conditioning, thereby enabling robust and accurate quantum simulation of many-body systems.

Ayush Asthana2026-03-10⚛️ quant-ph

A Concept of Two-Point Propagation Field of a Single Photon: A Way to Picometer X-ray Displacement Sensing and Nanometer Resolution 3D X-ray Micro-Tomography

This paper introduces the two-point propagation field (TPPF), a phase-sensitive quantity derived from single-photon detection probabilities that enables picometer-scale X-ray displacement sensing and deterministic, non-iterative 3D nanometer-resolution tomography by leveraging stable high-frequency sinusoidal structures and Fourier-Radon transformations.

Li Hua Yu2026-03-10⚛️ quant-ph

Critical re-examination of a claimed challenge to Bohmian mechanics

This paper re-examines a recent experiment challenging Bohmian mechanics by demonstrating that the data can be fully explained within Bohmian, Nelson's stochastic, and orthodox quantum frameworks, thereby concluding that the experiment is inconclusive in favoring or refuting any specific interpretation.

S. Di Matteo, C. Mazzoli2026-03-10⚛️ quant-ph

Wigner Cat Phases: A finely tunable system for exploring the transition to quantum chaos

This paper proposes a tunable quantum system combining a frozen qubit with a chaotic thermal bath that, under selective state observation, exhibits a novel "Wigner Cat Phase" characterized by bimodal "cat-ears" eigenstates and heavy-tailed level spacing statistics, representing a distinct non-thermal transition between quantum chaos and many-body localization that challenges standard integrability detection methods.

M. Süzen2026-03-10⚛️ quant-ph

Symmetric Informationally Complete Positive Operator Valued Measure and Zauner conjecture

The paper claims to prove the existence of Symmetric Informationally Complete Positive Operator Valued Measures (SIC-POVMs) in Hilbert spaces of any finite dimension $N$ , thereby confirming the Zauner conjecture.

Stefan Joka2026-03-10⚛️ quant-ph

Ermakov-Lewis Invariants in Stationary Bohm-Madelung Quantum Mechanics

This paper demonstrates that in stationary Bohm-Madelung quantum mechanics with a diagonal and separable Hamiltonian, the continuity constraint naturally induces an Ermakov-Pinney equation, revealing a hidden invariant structure that encodes the quantum potential as a geometric curvature contribution rather than a dynamical term, thereby providing exact stationary amplitudes and clarifying their ontological status as geometrically encoded structures.

Anand Aruna Kumar2026-03-10⚛️ quant-ph

Color Centers and Hyperbolic Phonon Polaritons in Hexagonal Boron Nitride: A New Platform for Quantum Optics

This paper establishes a cavity-QED framework connecting hexagonal boron nitride color centers with hyperbolic phonon polaritons, demonstrating how single quantum emitters can serve as on-chip sources to generate, control, and mediate long-range interactions of confined mid-infrared polaritons for advanced quantum optics applications.

Jie-Cheng Feng, Johannes Eberle, Sambuddha Chattopadhyay, Johannes Knörzer, Eugene Demler, Ataç \.Imamo\u{g}lu2026-03-10⚛️ quant-ph

Towards Trapped-Ion Thermometry Using Cavity-Based EIT

This paper proposes and theoretically validates a cavity-based electromagnetically induced transparency (EIT) technique for efficiently measuring the temperature and phonon occupation of trapped ions in the resolved-sideband regime, offering a simplified thermometry tool applicable to both strong and weak coupling cavity QED systems.

Abhijit Kundu, Vijay Bhatt, Arijit Sharma2026-03-10⚛️ quant-ph

Torsion-Induced Quantum Fluctuations in Metric-Affine Gravity using the Stochastic Variational Method

This review paper demonstrates that spatial torsion in Metric-Affine Gravity induces non-linear quantum fluctuations affecting spinless degrees of freedom through the Stochastic Variational Method, revealing a competitive interplay with Levi-Civita curvature and a structural parallelism with information geometry.

Tomoi Koide, Armin van de Venn2026-03-10⚛️ quant-ph

Spacetime-Efficient and Hardware-Compatible Complex Quantum Logic Units in qLDPC Codes

This paper introduces RASCqL, a reaction-time-limited architecture that leverages application-tailored qLDPC codes and reconfigurable neutral-atom arrays to achieve significant reductions in qubit footprint and space-time volume for complex quantum algorithms without requiring new hardware capabilities.

Willers Yang, Jason Chadwick, Mariesa H. Teo, Joshua Viszlai, Fred Chong2026-03-10⚛️ quant-ph

Directional Dynamics of the Non-Hermitian Skin Effect

This paper investigates the dynamical consequences of the non-Hermitian skin effect by applying quantum Liang information flow to a non-reciprocal Su-Schrieffer-Heeger model, revealing a scissors effect in directional asymmetry, NHSE-induced information blocking, and three distinct temporal regimes that establish the first quantitative link between static skin localization and directional information dynamics.

Bin Yi2026-03-10⚛️ quant-ph

Experimental demonstration of the absence of noise-induced barren plateaus using information content landscape analysis

This paper experimentally demonstrates on IBM quantum hardware that noise-induced barren plateaus do not necessarily occur, as gradient magnitudes saturate rather than decay exponentially due to $T_1$ -dominated non-unital noise, challenging the assumption that noise universally hinders variational quantum algorithms.

Sebastian Schmitt, Linus Ekstrøm, Alberto Bottarelli, Xavier Bonet-Monroig2026-03-10⚛️ quant-ph

Quantum diffusion for a quantum particle with a correlated Gaussian noise

This paper investigates the diffusive behavior of a quantum particle driven by correlated Gaussian noise by deriving the analytical solution for its joint probability density function and obtaining explicit expressions for the mean square momentum and mean square displacement.

Yun Jeong Kang, Sung Kyu Seo, Kyungsik Kim2026-03-10⚛️ quant-ph

Quantum Walks Assisted Bidirectional Remote State Preparation

This paper proposes a bidirectional remote state preparation protocol utilizing quantum walks on independent lattices and cycles, which dynamically generates the necessary entanglement to eliminate pre-shared resources and functions effectively in both uncontrolled and controller-assisted configurations.

K. K. Naseeda, Jumana Muhammed Abdul Asharaf, N. C. Randeep2026-03-10⚛️ quant-ph

Space Isotropy and Homogeneity Principles Determine the Maximum Nonlocality of Nature

This paper proposes that the fundamental principles of flat-space isotropy and homogeneity impose a strict tradeoff with nonlocality, uniquely determining the Tsirelson bound as the maximum possible degree of nonlocality in nature and suggesting that the probabilistic nature of quantum mechanics emerges from these spacetime symmetries.

Akbar Fahmi2026-03-10⚛️ quant-ph

Klein--Gordon oscillator with linear--fractional deformed Casimirs in doubly special relativity

This paper investigates the Klein-Gordon oscillator within a doubly special relativity framework featuring linear-fractional deformed Casimirs, deriving exact spectra and eigensolutions for timelike, spacelike, and lightlike deformations while establishing a pseudo-Hermitian formulation and comparing the spectral shifts to the Magueijo-Smolin model.

Abdelmalek Boumali, Nosratollah Jafari2026-03-10⚛️ quant-ph

On some signatures of Lie-Hamilton System in Quantum Hamilton Jacobi Equation

This paper demonstrates that the Quantum Hamilton-Jacobi equations for particles with constant mass, position-dependent effective mass, and non-Hermitian Swanson models can be reformulated as Cayley-Klein Riccati equations possessing a Lie-Hamilton structure, thereby enabling the derivation of their associated Lie symmetries and integrals.

Arindam Chakraborty2026-03-10⚛️ quant-ph

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