quant-ph papers | Gist.Science

Quantum physics explores the strange and often counterintuitive rules that govern the universe at its smallest scales. This field investigates how particles like electrons and photons behave in ways that defy our everyday intuition, forming the backbone of modern technologies from lasers to future quantum computers. While the mathematics can be daunting, the core ideas promise to revolutionize how we understand reality and process information.

At Gist.Science, we make these complex discoveries accessible to everyone. We systematically process every new preprint published in the Quant-Ph category on arXiv, transforming dense academic papers into clear, plain-language explanations alongside detailed technical summaries. Whether you are a seasoned researcher or a curious reader, our goal is to bridge the gap between cutting-edge theory and human understanding.

Below are the latest papers in quantum physics, distilled to help you grasp the newest breakthroughs without getting lost in the jargon.

⚛️ quantum physics

Fundamental Limits of Eavesdropper Detection and Localization in Optical Fiber via Stimulated Brillouin Scattering

This paper establishes a binary hypothesis testing framework to derive an effective input-output model for Stimulated Brillouin Scattering (SBS), enabling a comparative analysis of current state-of-the-art, near-future photon-counting, and ultimate quantum limit methods for detecting and localizing eavesdroppers in optical fiber Quantum Key Distribution (QKD) systems.

Kiran Adhikari, Janis Nötzel2026-04-21

🔢 mathematics

Causality from Projection and Hardy-Space Analyticity of Non-Markovian Memory Kernels

This paper rigorously establishes that Nakajima-Zwanzig memory kernels for open quantum systems with factorized initial states and continuous bath spectra belong to the Hardy space, thereby proving the validity of Kramers-Kronig dispersion relations and providing new theorems linking analyticity to physical constraints like complete positivity and stability, while demonstrating that correlated initial states can break this analyticity and lead to acausal dynamics.

Kejun Liu2026-04-21

⚛️ quantum physics

Time evolution of quantum gates and the necessity of complex numbers

This paper argues that complex numbers are indispensable for modeling the continuous time evolution of quantum gates, demonstrating that real-valued quantum mechanics fails to reproduce the necessary dynamics and entanglement due to group-theoretic constraints and the inherent complexity of standard gate representations.

M. P. Vaughan2026-04-21

⚛️ quantum physics

Thermodynamics of Coherence-Selective Quantum Reset Protocols

This paper establishes an exact theory for coherence-selective stroboscopic resetting in quadratic open quantum systems, revealing that protocols maximizing coherence retention are distinct from those maximizing heat dissipation and demonstrating that coherence-cost tradeoffs persist as a fundamental control principle even at nonzero chemical potential.

Jishad Kumar, Achilleas Lazarides, Tapio Ala-Nissila2026-04-21

🔬 materials science

Unraveling the significance of Raman modes, Gruneisen parameters and phonon lifetimes in the hexagonal allotropes of Silicon and Germanium compounds

This study employs first-principles calculations to comprehensively analyze the electronic structure, Raman-active phonon modes, Gruneisen parameters, and phonon lifetimes of hexagonal silicon and germanium allotropes, aiming to elucidate anharmonic effects and provide strategies for optimizing these materials for advanced thermoelectric, photovoltaic, and optoelectronic applications.

Lekshmi S M, Upasana Agrawal, Akarsh Jain, Siddharth Sastri, Suvadip Das2026-04-21

⚛️ quantum physics

Exponentially-enhanced Weak-field Sensing with Quantum Stark Localization

This paper demonstrates that quantum probes subjected to an exponentially graded Stark potential achieve genuine exponential scaling in weak-field sensing precision across both equilibrium and non-equilibrium regimes, including interacting many-body systems, without requiring adiabatic preparation or cooling.

Rozhin Yousefjani, Saif Al-Kuwari2026-04-21

⚛️ quantum physics

Efficient characterization of general Gottesman-Kitaev-Preskill qubits

This paper introduces an efficient characterization framework for general Gottesman-Kitaev-Preskill (GKP) qubits that utilizes positive semidefinite Hermitian operators requiring only three quadrature measurements to serve as non-Gaussianity witnesses and infidelity metrics, thereby overcoming the resource-intensive limitations of traditional quantum state tomography.

Vojtěch Kuchař, Petr Marek2026-04-21

⚛️ quantum physics

Fault-Tolerant Cut-Cat State Syndrome Extraction for Quantum Codes

This paper introduces the "cut-cat" syndrome extraction scheme for CSS codes, which achieves fault tolerance by using additional cat stabilizer measurements to correct hook errors while significantly reducing the number of simultaneous qubits and two-qubit gate counts compared to existing flag-based protocols.

Diego Forlivesi, Lorenzo Valentini, Marco Chiani2026-04-21

⚛️ quantum physics

A Novel Quantum Augmented Framework to Improve Microgrid Cybersecurity

This paper proposes a Quantum Augmented Microgrid (QuAM) framework that integrates secure quantum networking, anonymous notification, and random number generation to defend against high-impact cyberattacks, while quantifying the trade-offs between privacy, availability, and operational costs through simulation.

Nitin Jha, Prateek Paudel, Abhishek Parakh, Mahadevan Subramaniam2026-04-21

⚛️ quantum physics

Continuous-time quantum-walk centrality for protein residue interaction networks

This paper introduces a continuous-time quantum walk framework for analyzing protein residue interaction networks that identifies structurally and functionally important residues with strong agreement to classical methods while leveraging quantum interference, and validates its biological relevance and feasibility on near-term quantum hardware.

Shah Ishmam Mohtashim, Manas Sajjan, Sabre Kais2026-04-21

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