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Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Reinforcement learning of quantum circuit architectures for molecular potential energy curves
Maureen Krumtünger, Alissa Wilms, Paul K. Faehrmann +4 more·Nov 20, 2025
Quantum chemistry and optimization are two of the most prominent applications of quantum computers. Variational quantum algorithms have been proposed for solving problems in these domains. However, the design of the quantum circuit ansatz remains a c...
Simulating Gaussian boson sampling on graphs in polynomial time
Konrad Anand, Zongchen Chen, Mary Cryan +4 more·Nov 20, 2025
We show that a distribution related to Gaussian Boson Sampling (GBS) on graphs can be sampled classically in polynomial time. Graphical applications of GBS typically sample from this distribution, and thus quantum algorithms do not provide exponentia...
Analytical Fock Representation of Two-Mode Squeezing for Quantum Interference
Xuemei Gu, Carlos Ruiz-Gonzalez, Mario Krenn·Nov 20, 2025
Two-mode squeezing is central to entangled-photon generation and nonlinear interferometry, yet standard perturbative low-gain treatments and Gaussian formalisms can obscure the interference of photon-number amplitudes, especially in nonlinear interfe...
Quantum speed limit for observables from quantum asymmetry
Agung Budiyono, Michael Moody, Hadyan L. Prihadi +2 more·Nov 20, 2025
Quantum asymmetry and coherence are genuinely quantum resources that are essential to realize quantum advantage in information technologies. However, all quantum processes are fundamentally constrained by quantum speed limits, which raises the questi...
Comment on: "Scaling and Universality at Noisy Quench Dynamical Quantum Phase Transitions"
J. Sirker·Nov 20, 2025
In Ref. Ansari et al., dynamical quantum phase transitions (DQPTs) -- non-analyticities in the Loschmidt return rate at critical times -- are investigated in the presence of noise for a two-band model. The authors report that DQPTs persist even after...
Adiabatic charge transport through non-Bloch bands
Dharana Joshi, Tanay Nag·Nov 20, 2025
We explore the non-reciprocal intracell hopping mediated non-Hermitian topological phases of an extended Su-Schrieffer-Heeger model hosting second-nearest-neighbour hopping. We microscopically analyze the phase boundaries using the non-Bloch momentum...
Local fermion density in inhomogeneous free-fermion chains: a discrete WKB approach
Martín Zapata, Federico Finkel, Artemio González-López·Nov 20, 2025
We introduce a novel analytical approach for studying free-fermion (XX) chains with smoothly varying, site-dependent hoppings and magnetic fields. Building on a discrete WKB-like approximation applied directly to the recurrence relation for the singl...
Optimizing Quantum Key Distribution Network Performance using Graph Neural Networks
Akshit Pramod Anchan, Ameiy Acharya, Leki Chom Thungon·Nov 20, 2025
This paper proposes an optimization of Quantum Key Distribution (QKD) Networks using Graph Neural Networks (GNN) framework. Today, the development of quantum computers threatens the security systems of classical cryptography. Moreover, as QKD network...
From percolation transition to Anderson localization in one-dimensional speckle potentials
Margaux Vrech, Jan Major, Dominique Delande +2 more·Nov 20, 2025
Classical particles in random potentials typically experience a percolation phase transition, being trapped in clusters of mean size $χ$ that diverges algebraically at a percolation threshold. In contrast, quantum transport in random potentials is co...
Distinguishing thermal versus quantum annealing using probability-flux signatures across interaction networks
Yoshiaki Horiike, Yuki Kawaguchi·Nov 20, 2025
Simulated annealing provides a heuristic solution to combinatorial optimization problems. The cost function of a problem is mapped onto the energy function of a physical many-body system, and, by using thermal or quantum fluctuations, the system expl...
Identifying the $3$-qubit $W$ state with quantum uncertainty relation
Zhi-Jie Liu, Hao-Nan Qiang, Jie Zhou +2 more·Nov 20, 2025
The $W$ state, a canonical representative of multipartite quantum entanglement, plays a crucial role in quantum information science due to its robust entanglement properties. Quantum uncertainty relations, on the other hand, are a fundamental corners...
Exceptional-Point-Induced Sensitivity-Robustness Phase Transition in Quantum Interference
Xing Lin, Shuang Zhang·Nov 20, 2025
Quantum interference underpins many quantum information protocols but is typically studied in lossless Hermitian systems. Here, we reveal an exceptional point induced phase transition in two photon Hong Ou Mandel interference within a lossy coupled w...
On the resolution of categorical symmetries in (Non-) Unitary Rational CFTs
Arpan Bhattacharyya, Saptaswa Ghosh, Sounak Pal +1 more·Nov 20, 2025
We explore several aspects of the categorical symmetry-resolved entanglement entropy (SREE) in two-dimensional Rational Conformal Field Theories (RCFTs) and express it directly in terms of the modular data of the theory. Motivated by arXiv:2409.02806...
Tripartite Entanglement Generation in Atom-Coupled Dual Microresonators System
Abhishek Mandal, Joy Ghosh, Maruthi Manoj Brundavanam +1 more·Nov 20, 2025
In this work, we investigate the emergence and control of genuine tripartite entanglement in a hybrid cavity quantum electrodynamics architecture consisting of two linearly coupled single mode resonators, one of which interacts coherently with a two ...
On-chip Time-bin to Path Qubit Encoding Converter via Thin Film Lithium Niobate Photonics Chip
Xiaosong Ren, Zhanping Jin, Xiaotong Zou +6 more·Nov 20, 2025
The development of quantum internet demands on-chip quantum processor nodes and interconnection between the nodes. Path-encoded photonic qubits are suitable for on-chip quantum information processors, while time-bin encoded ones are good at long-dist...
ATLAS: Efficient Atom Rearrangement for Defect-Free Neutral-Atom Quantum Arrays Under Transport Loss
Otto Savola, Alexandru Paler·Nov 20, 2025
Neutral-atom quantum computers encode qubits in individually trapped atoms arranged in optical lattices. Achieving defect-free atom configurations is essential for high-fidelity quantum gates and scalable error correction, yet stochastic loading and ...
Emulation Capacity between Idempotent Channels
Idris Delsol, Omar Fawzi, Li Gao +1 more·Nov 20, 2025
We study the optimal rates of emulation (also called interconversion) between quantum channels. When the source and the target channels are idempotent, we give a single-letter expression for the zero-error emulation capacity in terms of structural pr...
Medusa: Detecting and Removing Failures for Scalable Quantum Computing
Karoliina Oksanen, Quan Hoang, Alexandru Paler·Nov 20, 2025
Quantum circuits will experience failures that lead to computational errors. We introduce Medusa, an automated compilation method for lowering a circuit's failure rate. Medusa uses flags to predict the absence of high-weight errors. Our method can nu...
Symmetry-Controlled Ultrastrong Phonon-Photon Coupling in a Terahertz Cavity
Dasom Kim, Maxime Dherbécourt, Sae R. Endo +8 more·Nov 20, 2025
Optical cavities provide a powerful means to engineer light-matter hybrid states by coupling confined electromagnetic fields with matter excitations. Achieving in situ control of the coupling strength is essential for investigating how such hybridiza...
Universal features of non-analytical energy storage in quantum critical quantum batteries
Riccardo Grazi, Dario Ferraro, Niccolò Traverso Ziani·Nov 20, 2025
Quantum batteries are quantum mechanical systems able to store and release energy in a controlled fashion. Among them, a special role is played by quantum structures defined as networks of two-level systems. In this context, it has recently been show...