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.

🔢 mathematics

Path integral formulation of finite-dimensional quantum mechanics in discrete phase space

This paper develops an exact path integral formulation for finite-dimensional quantum systems in discrete phase space, deriving a sum-over-paths propagator that captures full entanglement dynamics through coherent contributions from all fluctuation sectors, thereby overcoming the limitations of single-sector approximations and providing a framework for semiclassical simulation and non-classicality characterization.

Leonardo A. Pachon, Andres F. Gomez2026-04-23

🔬 condensed matter

Arrow of Time as an indicator of Measurement-Induced Phase Transitions

This paper establishes the arrow of time, defined by the irreversibility of quantum measurements, as a novel local diagnostic for measurement-induced phase transitions by analytically demonstrating its nonanalytic behavior and critical exponent in a random quantum circuit model.

Nitay Hurvitz, Alon Kochol, Victor Fleurov, Eran Sela2026-04-23

🔬 condensed matter

Unconventional Quantum Criticality in Long-Range Spin-1 Chains: Insights from Entanglement Entropy and Bipartite Fluctuations

Using a quantum Monte Carlo approach based on the split-spin representation, this study maps out the ground-state phase diagram of a spin-1 Heisenberg chain with staggered long-range interactions, identifying a nonconformal quantum critical point at $\alpha_c \approx 2.48$ that separates the gapped Haldane phase from a gapless Néel phase and is characterized by unconventional criticality with a dynamic exponent $z \neq 1$ .

Justin Tim-Lok Chau, Jiarui Zhao, Nicolas Laflorencie, Zi Yang Meng2026-04-23

⚛️ quantum physics

High-Girth Regular Quantum LDPC Codes from Affine-Coset Structures

This paper presents a construction of high-girth regular quantum LDPC codes using affine-coset structures and circulant permutation lifts, resulting in a $[[16384, 4142, \leq 40]]$ code that achieves a frame error rate of approximately $10^{-8}$ at a depolarizing error rate of 0.085.

Koki Okada, Kenta Kasai2026-04-23

⚛️ quantum physics

Scaling Network Topologies for Multi-User Entanglement Distribution

This paper proposes and analyzes a "connected tree" network topology that, by leveraging redundant edges for multi-path routing, outperforms traditional lattice structures in scalability and robustness against decoherence for large-scale entanglement distribution and quantum key distribution.

Muhammad Daud, Aeysha Khalique2026-04-22

⚛️ quantum physics

Empirical learning of dynamical decoupling on quantum processors

This paper demonstrates that a genetic algorithm-inspired search can empirically learn optimal dynamical decoupling strategies for IBM quantum processors, significantly outperforming canonical sequences in error suppression across various circuits while offering scalable, stable, and generalizable performance without the need for retraining.

Christopher Tong, Helena Zhang, Bibek Pokharel2026-04-22

⚛️ quantum physics

Monogamy of Entanglement Bounds and Improved Approximation Algorithms for Qudit Hamiltonians

This paper establishes new monogamy of entanglement bounds for two-local qudit Hamiltonians and introduces matching-based algorithms that significantly improve approximation guarantees for maximum energy, achieving ratios of $1/d$ for general graphs and $0.595$ for qubits, thereby outperforming previous random assignment and algorithmic approaches.

Zackary Jorquera, Alexandra Kolla, Steven Kordonowy, Juspreet Singh Sandhu, Stuart Wayland2026-04-22

🔬 physics

Magnetic moments in the Poynting theorem, Maxwell equations, Dirac equation, and QED

This paper demonstrates that electron magnetic dipole interactions can be consistently described using a field-only formulation that extends the Poynting theorem and Maxwell equations to include dipole sources, yielding results equivalent to conventional quantum electrodynamics without relying on electromagnetic potentials.

Peter J Mohr2026-04-22

⚛️ quantum physics

Quantum Non-Linear Bandit Optimization

This paper introduces the Q-NLB-UCB algorithm, a quantum-enhanced approach for non-linear bandit optimization that achieves an input dimension-free $O(\mathrm{poly}\log T)$ regret bound by leveraging quantum Monte Carlo estimation and a novel regression oracle, thereby overcoming the dimensionality limitations of existing methods in high-dimensional applications like drug discovery.

Zakaria Shams Siam, Chaowen Guan, Chong Liu2026-04-22

⚛️ quantum physics

Direct entanglement ansatz learning (DEAL) with ZNE on error-prone superconducting qubits

This paper introduces Direct Entanglement Ansatz Learning (DEAL), a method that combines a direct parameter-to-ansatz mapping with Zero Noise Extrapolation to significantly improve convergence and success rates for solving NP-hard combinatorial optimization problems on noisy superconducting quantum hardware.

Ziqing Guo, Steven Rayan, Wenshuo Hu, Ziwen Pan2026-04-22

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