Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Generalized Nonlinear Imaginary-Time Evolution
Chenyu Shi, Hao Wang, Jin-Fu Chen·Jul 10, 2026
Imaginary-time evolution (ITE) is a powerful method for ground-state preparation of a given Hamiltonian. The normalized ITE can be viewed as a gradient flow of the energy expectation value with respect to the Fubini--Study metric. In this work, we pr...
GHz-rate all-fiber active polarization state analyzer for quantum protocols
Andrea Pompermaier, Kannan Vijayadharan, Costantino Agnesi +3 more·Jul 10, 2026
Active selection of the measurement basis underpins quantum protocols including device-independent quantum key distribution, quantum teleportation with active feed-forward, and Bell tests. High-speed operation is crucial to minimize the latency betwe...
A Semiclassical Gaussian Wavepacket Method for Non-Adiabatic Molecular Dynamics
Lorenzo Bocchi, Jia-Xi Zeng, Michele Ceotto·Jul 10, 2026
We introduce two non-adiabatic semiclassical methods that employ two coupled Gaussian wavepackets, each one traveling on a separate diabatic potential energy surface. The wavepackets take the form of thawed Gaussians and are driven by classical equat...
Conceptual Networks for Cross-Linguistic Idiomatic Expressions: A Feature-Based Graph Approach
Kiran Pala, Punam Silu, Luxin Yu·Jul 10, 2026
We present an interpretable network-based framework for representing idiomatic and figurative meaning across eight typologically diverse languages, totaling 160 conventional expressions, the large majority of which are idiomatic. Each expression is a...
Confinement drives valley splitting above 4K in buried silicon quantum wells
Davide Degli Esposti, Emma Catherine Brann, Asser Elsayed +3 more·Jul 10, 2026
Controlling the energy scales of a quantum system is essential for defining robust qubits. In silicon spin qubits, the nearly degenerate conduction-band valleys create a leakage channel from the single-spin computational basis, posing a challenge to ...
Higher-Order Programs with Indefinite Causal Orders: a Linear Approach to Coherent Control of Quantum Processes
Kathleen Barsse, Romain Péchoux, Simon Perdrix·Jul 10, 2026
Processes with indefinite causal orders (ICOs), such as the quantum switch, are higher-order quantum processes that superpose the order in which quantum operations are performed. Such coherent control yields computational advantages but is not faithf...
Qubit-Boson Hybrid Beam-Splitter Gate with Kerr Nonlinearity in Circuit QED for Many-Body Dynamics
Andrea Mammola, Giuseppe Di Molfetta, Quentin Schaeverbeke·Jul 10, 2026
We introduce a hybrid qubit-boson beam-splitter gate in which a microwave cavity mode couples to an exchange-dressed two-level subsystem of an interacting two-qubit system in the presence of Kerr nonlinearity. Starting from a general circuit quantum ...
Majorana parity qubit in coupled minimal Kitaev chains
Francesco Zatelli, Bart Roovers, Nick van Loo +11 more·Jul 10, 2026
Majorana zero modes provide a route to fault-tolerant qubits by encoding information non-locally in fermion parity. Their sensitivity to noise is expected to decrease exponentially with increasing separation between the Majoranas, a suppression known...
Superconducting singlet-triplet qubits
Anatoliy Lotkov, Maria Spethmann, Daniel Loss·Jul 10, 2026
Hybrid devices integrating quantum dots with Josephson junctions are gaining interest because they combine spin-based quantum computing with circuit quantum electrodynamics (circuit QED) methods. In particular, Andreev spin qubits have shown signific...
Playing Bayesian games better with separable quantum states than with any classical correlation
Yaqing Xy Wang, Giannicola Scarpa, Andreas Winter·Jul 10, 2026
Bayesian games, also known as games of incomplete information, are a fruitful arena for exploring the impact of correlations on a set of independent agents (players) via the game equilibria to which they give rise. It was realised some time ago that ...
Orthogonal Quantum Krylov Diagonalisation
Hadi Rammal, Alexandre Perrin, Oumaya Ladhari +3 more·Jul 10, 2026
Quantum subspace-diagonalization methods, particularly Quantum Krylov Diagonalization (QKD), provide a promising route for computing low-energy spectra of quantum many-body Hamiltonians. However, existing quantum Krylov approaches rely on non-orthogo...
A combinatorial framework for clustering graph states: Algorithms and hardness for rank-integrity
Romain Bourneuf, Nathan Claudet, Sang Yoon Kim +3 more·Jul 10, 2026
We introduce a new notion of distance between two graph states $|G\rangle$ and $|G'\rangle$ on the same set of qubits. This distance is the minimum number of ancilla qubits in a graph state $|\widehat{G}\rangle$ from which both $|G\rangle$ and $|G'\r...
Diagnosing quantum reservoirs at scale based on expressivity and coverage
Laia Domingo, Oriol Balló-Gimbernat, Fernando Vilariño·Jul 10, 2026
Quantum reservoirs offer a hardware-friendly route to quantum machine learning, replacing trainable circuits with fixed random dynamics and a classical readout. Because the reservoir is not optimized, performance depends entirely on the choice of res...
Speckle-based feedback control of optical dipole trap axial waist position
D. A. Pershin, D. A. Kumpilov, A. E. Rudnev +11 more·Jul 10, 2026
Cold neutral atoms is a powerful tool for many experiments ranging from frequency standards and sensing to quantum simulations. Sensitive experiments often demand transferring cold atoms from one vacuum chamber to the other with better optical access...
Circuit and Krylov complexity of primordial perturbations of modified gravity in inflation
Tao Li, Hai-Bing Fu·Jul 10, 2026
In this work, we investigate quantum complexity diagnostics of primordial curvature perturbations within the inflationary paradigm. We compare canonical scalar-field inflation with the modified gravity model $f(φ,R)$, focusing on the evolution of the...
COSMA: Communication-aware Optimization of Fermionic Simulation Kernels for Modular Quantum Architectures
Enrico Russo, Francesco G. Blanco, Elio Vinciguerra +3 more·Jul 10, 2026
Quantum simulation is a leading application of quantum computing, but scaling to chemically relevant problems requires modular architectures composed of interconnected quantum processing units. In such systems, inter-core quantum communication become...
When Routes Run Out: Adversarial Co-Learning and Explainable Robustness in Quantum Repeater Networks
Brennan Bell, Inti Gabriel Mendoza Estrada, Andreas Trügler +1 more·Jul 10, 2026
We study an adversarial bandit problem for entanglement-based quantum-network routing over a modest graph corpus. Alice selects an end-to-end repeater route for an Ekert-91 protocol (E91) representing her move, while Eve selects an attack surface, ei...
Deterministic Generation of Linear Photonic Cluster States with Semiconductor Quantum Dots: A Detailed Comparison of Different Schemes
Nikolas Köcher, Stefan Schumacher·Jul 10, 2026
Photonic graph states are key resource states for measurement based quantum information processing. As semiconductor quantum dots are excellent deterministic photon emitters, several protocols using them for the generation of linear cluster states ha...
Quantum Approximate Optimization via Noise-Directed Adaptive Warm-Starting
Filip B. Maciejewski, Stuart Hadfield, Oscar Wallis +5 more·Jul 10, 2026
Progress towards a quantum advantage using known heuristic methods for combinatorial optimization is impeded by hardware noise and limited qubit count. Here, we propose a noise-aware adaptive approach to quantum approximate optimization, Noise-Direct...
Benchmarking Error Mitigation: Artefactual Improvements in Zero-Noise Extrapolation
Dominik Köster, Wolfgang Mauerer·Jul 10, 2026
Reliable benchmarking of Quantum Error Mitigation (QEM) requires distinguishing genuine improvements from artefacts of the post-processing arithmetic. In this paper, we expose a failure mode in Richardson Zero-Noise Extrapolation (ZNE), a widely used...