Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Comparison of Nb and Ta Pentoxide Loss Tangents for Superconducting Quantum Devices
D. P. Goronzy, W. W. Mah, P. G. Lim +14 more·Dec 5, 2025
Superconducting transmon qubits are commonly made with thin-film Nb wiring, but recent studies have shown increased performance with Ta wiring. In this work, we compare the resonator-induced single photon, millikelvin dielectric loss for pentoxides o...
Exe.py: Ab initio fine structure parameters for trigonal defect qubits within the E$\otimes$e Jahn-Teller case
Balázs Tóth, Ádám Gali, G. Thiering·Dec 5, 2025
Trigonal solid-state defects are often subjects of spontaneous symmetry breaking driven by the $E\otimes e$ Jahn-Teller effect, reflecting strong electron-phonon coupling. These systems, particularly paramagnetic defect qubits in solids are central f...
A polynomial dimension-dependence analysis of Bramble-Pasciak-Xu preconditioners
Boou Jiang, Jongho Park, Jinchao Xu·Dec 5, 2025
We investigate the dimension dependence of Bramble--Pasciak--Xu (BPX) preconditioners for high-dimensional partial differential equations and establish that the condition numbers of BPX-preconditioned systems grow only polynomially with the spatial d...
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...
An evaluation of A15 Nb3Al superconducting thin films for application in quantum circuits
Joseph D. Falvo, Brooke Henry, Bernardo Langa +4 more·Dec 5, 2025
A15 superconductors are distinguished by their high critical temperatures, magnetic fields, and current-carrying capabilities. Among them, Nb$_3$Al is of particular interest for superconducting quantum circuits as a means to extend device operating t...
Highly resilient, error-protected quantum gates in a solid-state quantum network node
E. Poem, M. I. Cohen, S. Blum +8 more·Dec 4, 2025
High-fidelity quantum gates are a cornerstone of any quantum computing and communications architecture. Realizing such control in the presence of realistic errors at the level required for beyond-threshold quantum error correction is a long-standing ...
Photoelectrical detection and characterization of divacancy and PL5-PL7 spins in silicon carbide
Naoya Morioka, Tetsuri Nishikawa, Hiroshi Abe +2 more·Dec 4, 2025
Photoelectrical detection of magnetic resonance (PDMR) offers a scalable alternative to optical readout of spin defects in semiconductors and is particularly promising for near-infrared (NIR) emitters, where photodetection is often challenging. Here,...
Non-equilibrium quantum field theory of the free-electron laser in Keldysh formalism
Loris Di Cairano·Dec 4, 2025
We develop a non-equilibrium quantum field theory of the free-electron laser based on the Preparata model, using the real-time Keldysh formalism. Starting from a microscopic Lagrangian for a relativistic electron beam coupled to a single radiation mo...
Real-time optimal quantum control for atomic magnetometers with decoherence
Julia Amoros-Binefa·Dec 4, 2025
Quantum entanglement, in the form of spin squeezing, is known to improve the sensitivity of atomic sensors to static or slowly varying fields. Sensing transient events presents a distinct challenge, requires different analysis tools, and has not been...
Boosting Work Extraction in Quantum Batteries via Continuous Environment Monitoring
Gabriele Cenedese, Giuliano Benenti, Dario Ferraro +1 more·Dec 4, 2025
Quantum correlations that typically develop between a quantum battery and its charger reduce the amount of work extractable from the battery. We show that by coupling the system with an additional environment that can be continuously monitored, one c...
Bridging quantum and classical computing for partial differential equations through multifidelity machine learning
Bruno Jacob, Amanda A. Howard, Panos Stinis·Dec 4, 2025
Quantum algorithms for partial differential equations (PDEs) face severe practical constraints on near-term hardware: limited qubit counts restrict spatial resolution to coarse grids, while circuit depth limitations prevent accurate long-time integra...
Analog quantum simulation of the Lipkin-Meshkov-Glick model in a transmon qudit
Elizabeth Champion, Annie Schwartz, Muhammad A. Ijaz +4 more·Dec 4, 2025
The simulation of large-scale quantum systems is one of the most sought-after applications of quantum computers. Of particular interest for near-term demonstrations of quantum computational advantage are analog quantum simulations, which employ analo...
A Framework for Quantum Simulations of Energy-Loss and Hadronization in Non-Abelian Gauge Theories: SU(2) Lattice Gauge Theory in 1+1D
Zhiyao Li, Marc Illa, Martin J. Savage·Dec 4, 2025
Simulations of energy loss and hadronization are essential for understanding a range of phenomena in non-equilibrium strongly-interacting matter. We establish a framework for performing such simulations on a quantum computer and apply it to a heavy q...
Constraint-oriented biased quantum search for linear constrained combinatorial optimization problems
Sören Wilkening, Timo Ziegler, Maximilian Hess·Dec 4, 2025
In this paper, we extend a previously presented Grover-based heuristic to tackle general combinatorial optimization problems with linear constraints. We further describe the introduced method as a framework that enables performance improvements throu...
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...
Multimode equilibrium approximations in light-matter systems from weak to strong coupling
Davis M. Welakuh, Vasil Rokaj, Michael Ruggenthaler +1 more·Dec 4, 2025
In this work, we detail different approaches to treat multi-mode photonic environments within non-relativistic quantum electrodynamics in the long-wavelength approximation efficiently. Specifically we show that for equilibrium properties of coupled l...
Quantum compilation framework for data loading
Guillermo Alonso-Linaje, Utkarsh Azad, Jay Soni +3 more·Dec 4, 2025
Efficient encoding of classical data into quantum circuits is a critical challenge that directly impacts the scalability of quantum algorithms. In this work, we present an automated compilation framework for resource-aware quantum data loading tailor...
Investigating a Quantum-Inspired Method for Quantum Dynamics
Bo Xiao, Benedikt Kloss, E. Miles Stoudenmire·Dec 4, 2025
Building on recent advances in quantum algorithms which measure and reuse qubits and in efficient classical simulation leveraging projective measurements, we extend these frameworks to real-time dynamics of quantum many-body systems undergoing discre...
The deep Hilbert space of all-to-all interacting SU(3) atoms: from quantum to classical
Federico Balducci, Aleksandra A. Ziolkowska·Dec 4, 2025
We study the emergence of chaos in multilevel atoms with all-to-all interactions, inspired by cavity QED. Focusing on a 3-level Tavis-Cummings model in a far detuned limit, we detail its deep Hilbert space structure -- i.e. we enumerate all distinct ...
Decoy-state quantum key distribution over 227 km with a frequency-converted telecom single-photon source
Frederik Brooke Barnes, Roberto G. Pousa, Christopher L. Morrison +7 more·Dec 4, 2025
We implement a decoy-state quantum key distribution scheme using a telecom C-band single-emitter source. The decoy states are created by varying the optical excitation of the quantum emitter to modulate the photon number distribution. We provide an a...