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

Multiphoton heralding generates large-amplitude squeezed Schrödinger cat states and parity-selective Fock superpositions from squeezed vacuum via an OPA

This paper proposes a multiphoton heralding scheme using an optical parametric amplifier to convert squeezed vacuum into large-amplitude squeezed Schrödinger cat states and parity-selective Fock superpositions, which exhibit strong Wigner negativity, loss-resilient quantum complexity, and Heisenberg-limited phase estimation capabilities.

Yusuf Turek, Ming-Yan Sun, Xiao-Xi Yao2026-05-25

🔬 mesoscale physics

Atom-Photon Bound States in Fractal Photonic Lattices: Localization Length and Anomalous Diffusion

This paper demonstrates that atom-photon bound states in self-similar fractal photonic lattices exhibit a far-field localization length scaling inversely with the detuning raised to the power of the walk dimension, a relationship driven by anomalous diffusion and confirmed through exact diagonalization on various fractal geometries.

Florian Bönsel, Flore K. Kunst, Federico Roccati2026-05-25

⚛️ quantum physics

Optimizing Parallel Execution of Commuting Pauli Product Rotations

This paper proposes two heuristics, clique reshuffling and generator restructuring, to optimize the parallel execution of commuting Pauli Product Rotations in fault-tolerant quantum computing by mitigating per-qubit port constraints, thereby achieving significant reductions in hardware-limited circuit depth.

Sayam Sethi, Devika Nambisan, Jonathan Mark Baker2026-05-25

⚛️ quantum physics

IntegrateUnitary.jl: A Julia package for symbolic integration over Haar measures

This paper introduces \texttt{IntegrateUnitary.jl}, an open-source Julia package that implements the Weingarten calculus and Wick contractions to perform exact symbolic integration of polynomial functions over various compact groups and random matrix ensembles, offering tools for quantum information science and random matrix theory.

Łukasz Pawela, Zbigniew Puchała2026-05-25

🔢 mathematics

Convexity and non-Markovianity of Weyl Maps

This paper establishes a complete algebraic classification of Weyl dynamical maps on finite-dimensional systems using the Hermite normal form, revealing that non-Markovianity is non-additive under convex mixing and demonstrating the existence of irreducible eternally non-Markovian maps in dimensions higher than qubits, thereby extending the theory of quantum memory effects beyond the Pauli framework.

Wen Xu, Vinayak Jagadish2026-05-25

⚛️ general relativity

Indefinite probabilities in quantum spacetime: A deepening of unpredictability

This paper demonstrates that employing the $SU_q(2)$ quantum group to model rotational symmetry in spin- $\frac{1}{2}$ systems leads to non-commuting probability operators and an associated uncertainty principle, thereby establishing a framework of "indefinite probabilities" that fundamentally prevents observers from sharply measuring their relative orientation.

Vittorio D'Esposito, Giuseppe Fabiano, Domenico Frattulillo2026-05-25

⚛️ high-energy theory

Not all black holes decohere quantum superpositions

The paper demonstrates that near-extremal charged black holes can suppress or even eliminate the decoherence of charged particle superpositions at late times due to a spin-induced energy gap in the quantum black hole spectrum, thereby enhancing quantum coherence beyond semiclassical expectations.

Anna Biggs, Stefano Trezzi2026-05-25

⚛️ quantum physics

A Two-Branch Finite-Field Construction for Regular CSS LDPC Bases

This paper introduces a two-branch finite-field construction for regular CSS LDPC quantum codes that decouples base matrix design from cyclic lifting to satisfy orthogonality and girth constraints, demonstrating through a specific (3,10)-regular example that the resulting [[10240,4108]] code achieves a frame error rate of $1.0\times10^{-7}$ at a depolarizing probability of 0.058 using joint belief propagation with low-complexity post-processing.

Koki Okada, Kenta Kasai2026-05-25

⚛️ quantum physics

Phases of decodability in the surface code with unitary errors

This paper investigates the maximum likelihood decoding of the surface code under unitary errors by mapping it to a (1+1)D transfer matrix contraction, revealing a distinct phase where ferromagnetic order coexists with volume-law entanglement, rendering the encoded information theoretically retained but effectively undecodable.

Yimu Bao, Sajant Anand2026-05-22

⚛️ high-energy theory

Generalized CV Conjecture and Krylov Complexity in Two-Mode Hermitian Systems via Information Geometry

This paper extends the Complexity=Volume (CV) conjecture to two-mode Hermitian systems by demonstrating that the Krylov complexity of both closed and open quantum states exactly matches the volume of the Fubini-Study metric, thereby establishing a direct link between operator growth and information geometry.

Ke-Hong Zhai, Lei-Hua Liu, Hai-Qing Zhang2026-05-22

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