Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Mechanically mediated optical-microwave quantum state transfer by feedback
Max P. Foreman, Jesse J. Slim, Warwick P. Bowen·Dec 5, 2025
State transfer between light and microwaves is a key challenge in quantum networks. Promising transducers use a mechanical intermediary that couples to both fields via radiation pressure. Such electro-optomechanical devices have achieved high efficie...
Concentrated Monte Carlo sampling for local observables in quantum spin chains
Wenxuan Zhang, Dingzu Wang, Dario Poletti·Dec 5, 2025
Monte Carlo methods are widely used to estimate observables in many-body quantum systems. However, conventional sampling schemes often require a large number of samples to achieve sufficient accuracy. In this work we propose the concentrated Monte Ca...
Resolving Abrikosov vortex entry in superconducting nano-string resonators via displacement-noise spectroscopy in cavity-optomechanics
T. Luschmann, T. Parvini, Lukas Niekamp +3 more·Dec 5, 2025
Abrikosov vortices in type-II superconductors critically influence current flow and coherence, thereby imposing fundamental limits on superconducting quantum technologies. Quantum circuits employ superconducting elements at micro- and mesoscopic scal...
Hardware-inspired Continuous Variables Quantum Optical Neural Networks
Todor Krasimirov-Ivanov, Alba Cervera-Lierta, Paolo Stornati +1 more·Dec 4, 2025
Continuous-variables (CV) quantum optics is a natural formalism for neural networks (NNs) due to its ability to reproduce the information processing of such trainable interconnected systems. In quantum optics, Gaussian operators induce affine mapping...
Circuit Quantum Acoustodynamics in a Scalable Phononic Integrated Circuit Architecture
Weiting Wang, Lintao Xiao, Bo Zhang +11 more·Dec 4, 2025
Previous demonstrations of quantum acoustic systems have been limited to isolated devices, with limited capability to route phonons and interconnect multi-port acoustic elements for further extension. Here, we demonstrate a scalable architecture for ...
Communicating Properties of Quantum States over Classical Noisy Channels
Nikhitha Nunavath, Jiechen Chen, Osvaldo Simeone +2 more·Dec 4, 2025
Transmitting information about quantum states over classical noisy channels is an important problem with applications to science, computing, and sensing. This task, however, poses fundamental challenges due to the exponential scaling of state space w...
PVLS: A Learning-based Parameter Prediction Technique for Variational Quantum Linear Solvers
Youla Yang·Dec 4, 2025
Variational Quantum Linear Solvers (VQLS) are a promising method for solving linear systems on near-term quantum devices. However, their performance is often limited by barren plateaus and inefficient parameter initialization, which significantly hin...
Multiphoton interference outperforms pairwise overlaps for distinguishability characterization
S. N. van den Hoven, M. C. Anguita, S. Marzban +1 more·Dec 4, 2025
We propose a protocol that characterizes the pairwise overlaps of the internal modes of single photons more efficiently than pairwise Hong-Ou-Mandel characterization experiments. This protocol exploits multiphoton interference. We experimentally impl...
Bayesian stepwise estimation of qubit rotations
Mylenne Manrique, Marco Barbieri, Assunta Di Vizio +4 more·Dec 4, 2025
This work investigates Bayesian stepwise estimation (Se) for measuring the two parameters of a unitary qubit rotation. While asymptotic analysis predicts a precision advantage for SE over joint estimation (JE) in regimes where the quantum Fisher info...
Continuously tunable single-photon level nonlinearity with Rydberg state wave-function engineering
Biao Xu, Gen-Sheng Ye, Yue Chang +2 more·Dec 4, 2025
Extending optical nonlinearity into the extremely weak light regime is at the heart of quantum optics, since it enables the efficient generation of photonic entanglement and implementation of photonic quantum logic gate. Here, we demonstrate the capa...
A Mutual Information-based Metric for Temporal Expressivity and Trainability Estimation in Quantum Policy Gradient Pipelines
Jaehun Jeong, Donghwa Ji, Kabgyun Jeong·Dec 4, 2025
In recent years, various limitations of conventional supervised learning have been identified, motivating the development of reinforcement learning--and quantum reinforcement learning that leverages quantum resources such as entanglement and superpos...
Combined Quantum and Post-Quantum Security Performance Under Finite Keys
Aman Gupta, Ravi Singh Adhikari, Anju Rani +2 more·Dec 4, 2025
Recent advances in quantum-secure communication have highlighted the value of hybrid schemes that combine Quantum Key Distribution (QKD) with Post-Quantum Cryptography (PQC). Yet most existing hybrid designs omit realistic finite-key effects on QKD k...
Relative Wavefront Error Correction Over a 2.4 km Free-Space Optical Link via Machine Learning
Nathan K. Long, B. Dix-Matthews, Alexander Frost +4 more·Dec 4, 2025
In coherent optical communication across turbulent atmospheric channels, reference beacons can be multiplexed with information-encoded signals during transmission. In this case, it is commonly assumed that the wavefront distortion of the two is equiv...
Universal Quantum Interconnects via Phase-Coherent Four-Wave Mixing
Hao Zhang, Yang Xu, Linshan Sun +3 more·Dec 3, 2025
Quantum transduction, which enables the coherent conversion of quantum information between disparate physical platforms, is a cornerstone for realizing scalable and interoperable quantum networks. Among various approaches, parametric frequency mixing...
Entanglement membrane in the Brownian SYK chain
Márk Mezei, Harshit Rajgadia·Dec 3, 2025
There is mounting evidence that entanglement dynamics in chaotic many-body quantum systems in the limit of large subsystems and long times is described by an entanglement membrane effective theory. In this paper, we derive the membrane description in...
Minimizing the Number of Code Switching Operations in Fault-Tolerant Quantum Circuits
Erik Weilandt, Tom Peham, Robert Wille·Dec 3, 2025
Fault-tolerant quantum computers rely on Quantum Error-Correcting Codes (QECCs) to protect information from noise. However, no single error-correcting code supports a fully transversal and therefore fault-tolerant implementation of all gates required...
Instantaneous Sobolev Regularization for Dissipative Bosonic Dynamics
Pablo Costa Rico, Paul Gondolf, Tim Möbus·Dec 3, 2025
We investigate quantum Markov semigroups on bosonic Fock space and identify a broad class of infinite-dimensional dissipative evolutions that exhibit instantaneous Sobolev-regularization. Motivated by stability problems in quantum computation, we sho...
Entanglement Detection with Rotationally Covariant Measurements -- From Compton Scattering to Lemonade
Marlene Funck, Ilija Funk, Tizian Schmidt +1 more·Dec 3, 2025
The accurate and efficient detection of quantum entanglement remains a central challenge in quantum information science. In this work, we study the detection of entanglement of polarized photons for measurement devices that are solely specified by ro...
Experimental Quantum Electronic Voting
Nicolas Laurent-Puig, Matilde Baroni, Federico Centrone +1 more·Dec 3, 2025
Quantum information protocols offer significant advantages in properties such as security, anonymity, and privacy for communication and computing tasks. An application where guaranteeing the highest possible security and privacy is critical for democ...
Widefield Quantum Sensor for Vector Magnetic Field Imaging of Micromagnetic Structures
Orlando D. Cunha, Filipe Camarneiro, João P. Silva +4 more·Dec 3, 2025
Many spintronic, magnetic-memory, and neuromorphic devices rely on spatially varying magnetic fields. Quantitatively imaging these fields with full vector information over extended areas remains a major challenge. Existing probes either offer nanosca...