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.

🔬 optics

Attosecond Path Qubits in High-Harmonic Generation: Classical Dephasing and Trace-Out Decoherence

This paper proposes an "attosecond path qubit" framework based on high-harmonic generation's short and long electron trajectories, utilizing a trajectory-resolved density matrix to distinguish between classical dephasing from ensemble averaging and quantum decoherence caused by tracing out unobserved degrees of freedom, thereby offering new methods to diagnose coherence loss and engineer quantum states in attosecond interferometry.

A. Marchisio, C. Granados, M. F. Ciappina, O. Cohen2026-06-19

⚛️ quantum physics

Sparse Configuration Interaction for the Electronic Schrödinger Equation Revisited: Complete Basis Set Limit Complexity and Quantum-Encoding Impact

This paper revisits the regularity of electronic Schrödinger equation eigenfunctions to demonstrate that sparse grid constructions can mitigate the curse of dimensionality in the complete basis set limit, yielding convergence rates independent of electron count that benefit both classical solvers and qubit-efficient quantum encodings.

Michael Griebel, Jan Hamaekers2026-06-19

⚛️ quantum physics

Faking entanglement with imperceptible measurement deviations

This paper demonstrates that arbitrarily small, adversarially encoded measurement errors can falsely certify high-dimensional entanglement in separable systems, revealing a critical vulnerability in current quantum verification methods that necessitates the development of robust, secure detection protocols.

Jaime Moreno, Elna Svegborn, Simon Morelli, Markus Hiekkamäaki, Lea Kopf, Robert Fickler, Armin Tavakoli2026-06-19

⚛️ high-energy theory

Many-body chirality of topological stabilizer states

This paper introduces a quantum-information theoretic definition of many-body chirality as an obstruction to transforming a state into its complex conjugate via finite-depth local operations, demonstrating that stabilizer states of $\mathbb{Z}_d^{(k)}$ anyon theories exhibit this chirality and intrinsic imaginarity even when conventional diagnostics like modular commutators or chiral central charges vanish.

Tyler D. Ellison, Dongjin Lee, Zhi Li, Amin Moharramipour, Yasamin Panahi, Beni Yoshida2026-06-19

⚛️ general relativity

Impossibility of superluminal signalling rules out causal loops in conical spacetimes

This paper resolves a key open question by demonstrating that while operationally detectable causal loops are theoretically possible in (1+1)-dimensional Minkowski spacetime without violating the no-superluminal-signalling principle, such loops are strictly ruled out in higher-dimensional conical spacetimes across classical, quantum, and post-quantum theories, thereby establishing that the relationship between no superluminal signalling and the absence of causal loops is inherently dependent on spacetime geometry.

Maarten Grothus, V. Vilasini2026-06-19

⚛️ quantum physics

Fidelity bounds for adiabatic gates and other quantum operations with time-dependent dissipation

This paper generalizes analytical fidelity-reduction formulae to account for time-dependent dissipation in quantum operations, revealing that flux-dependent noise and qubit-coupler hybridization significantly degrade the fidelity of adiabatic controlled-Z gates in superconducting quantum computers.

Simon Pettersson Fors, Aniket Patel, Anton Frisk Kockum, Tahereh Abad2026-06-19

⚛️ quantum physics

General circuit mapping algorithm for neutral atom quantum computers

This paper proposes a graph-theoretic framework and genetic algorithm-based solver to optimize qubit mapping for neutral atom quantum computers, minimizing transfer counts and distances while respecting spatial constraints to improve execution efficiency.

Neven Gentil, Lous S. Rianne, Aida Todri-Sanial2026-06-19

⚛️ quantum physics

Approximating optimal decoding of quantum LDPC codes with narrow frontiers

This paper introduces the Frontier decoder, a pruned dynamic-programming algorithm that achieves state-of-the-art performance for quantum LDPC codes by approximating optimal decoding with linear complexity and a very small retained list size.

Anthony Leverrier, Rüdiger Urbanke2026-06-19

⚛️ quantum physics

GPU-accelerated semidefinite programming for causal games

This paper presents a GPU-accelerated semidefinite programming solver that enables the exploration of higher local dimensions in causal games, revealing that increasing the dimension beyond $d=5$ does not significantly improve the winning probability, thereby suggesting that current strategies are insufficient to close the gap with known upper bounds.

Emanuel-Cristian Boghiu, Kyrylo Simonov2026-06-19

⚛️ quantum physics

Near-Optimal Learning of Local Lindbladians

This paper presents a near-optimal, non-adaptive algorithm for learning local Lindbladians from black-box access that achieves $\widetilde{O}(\Lambda^2/\varepsilon^2)$ channel uses and $\widetilde{O}(\Lambda/\varepsilon^2)$ total evolution time using only random product states and Pauli measurements, while proving that these scaling limits are information-theoretically fundamental and preclude Heisenberg-limited performance in the presence of dissipation.

Itai Arad, Zhili Chen, Naixu Guo, Patrick Rebentrost, Zhan Yu2026-06-19

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