Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Wave-like amplification of near-threshold two-particle reactions: from muon-catalyzed fusion to $Λ\barΛ$ production at $e^-e^+$ annihilation
Vladimir S. Melezhik·Jan 30, 2026
A simple model is proposed to explain the recently found wave-like enhancement of the $Λ\barΛ$ pair production near the threshold at the $e^-e^+$ annihilation, which allows extracting model-independent scattering parameters and spectral information f...
A room-temperature cavity-magnonic source of correlated microwave pairs
Qiuyuan Wang, Aravind Karthigeyan, Chung-Tao Chou +1 more·Jan 30, 2026
Correlated microwave photon sources are key enablers for technologies in quantum-limited sensing, signal amplification and communication, but the reliance on millikelvin operating temperature limits their scalability for broader applications. Here, a...
Remarks on Dirac-Bergmann algorithm, Dirac's conjecture and the extended Hamiltonian
Kirill Russkov·Jan 30, 2026
The Dirac-Bergmann algorithm for the Hamiltonian analysis of constrained systems is a nice and powerful tool, widely used for quantization and non-perturbative counting of degrees of freedom. However, certain aspects of its application to systems wit...
From Feynman-Vernon to Wiener Stochastic Path Integral
Antonio Camurati, Felipe Sobrero, Bruno Suassuna +1 more·Jan 30, 2026
We establish a direct connection between the Feynman-Vernon path integral formalism for open quantum systems and the Wiener path integral used in classical stochastic dynamics. By considering a generalized influence functional in the strong decoheren...
Lower bounds on non-local computation from controllable correlation
Richard Cleve, Alex May·Jan 30, 2026
Understanding entanglement cost in non-local quantum computation (NLQC) is relevant to complexity, cryptography, gravity, and other areas. This entanglement cost is largely uncharacterized; previous lower bound techniques apply to narrowly defined ca...
Synchronized distribution of quantum entanglement coexisting with high-rate, broadband classical optical communications over a real-world fiber link
Gina M. Talcott, Ahnnika I. Hess, Laura d'Avossa +8 more·Jan 30, 2026
Compatibility with existing classical network infrastructure offers a scalable path towards deploying largescale quantum networks. Here, we demonstrate O-band polarization-encoded quantum entanglement distribution over an installed 24.4-km fiber whil...
Fermionic magic resources in disordered quantum spin chains
Pedro R. Nicácio Falcão, Jakub Zakrzewski, Piotr Sierant·Jan 30, 2026
Fermionic non-Gaussianity quantifies a quantum state's deviation from a classically tractable free-fermionic description, constituting a necessary resource for computational quantum advantage. Here we use fermionic antiflatness (FAF) to measure this ...
Complexity of Quantum Trajectories
Luca Lumia, Emanuele Tirrito, Mario Collura +2 more·Jan 30, 2026
Open quantum systems can be described by unraveling Lindblad master equations into ensembles of quantum trajectories. Here we investigate how the complexity of such trajectories is affected by conservation laws and other dynamical constraints of the ...
Topological Defects from Quantum Reset Dynamics
R. Jafari, Henrik Johannesson, Sebastian Eggert·Jan 30, 2026
We analyze mechanisms for universal out-of-equilibrium dynamics near criticality by exploring the effect of randomized quantum resetting (QR) under a finite-time quench across a quantum phase transition. Using the transverse-field Ising chain as a ge...
Signatures of coherent initial ensembles on all work moments
Pranay Nayak, Sreenath K. Manikandan, Tan Van Vu +1 more·Jan 30, 2026
Standard treatments of quantum work using projective energy measurements erase initial coherence and alter the dynamics, thereby failing to capture the thermodynamic effects of coherent superpositions of energy eigenstates in an ensemble of initial s...
Robust multiparameter estimation using quantum scrambling
Wenjie Gong, Bingtian Ye, Daniel Mark +1 more·Jan 30, 2026
We propose and analyze a versatile and efficient multiparameter quantum sensing protocol, which simultaneously estimates many non-commuting and time-dependent signals that are coherently or incoherently coupled to sensing particles. Even in the prese...
Understanding multiscale disorder in superconducting nanowire single photon detectors
Nirjhar Sarkar, Ronan Gourgues, Yueh-Chun Wu +7 more·Jan 30, 2026
Superconducting nanowire single-photon detectors are central to applications across quantum information science. Yet, their performance is limited by the effects of disorder and electrodynamic inhomogeneities that are not well understood. By combinin...
Analytical topological invariants for 2D non-Hermitian phases using Morse theory
Cameron Gibson, Evelyn Tang·Jan 30, 2026
As energy dissipation and gain are ubiquitous in the real world, such phenomena demand the generalization of Hermitian methods such as the analysis of topological properties for non-Hermitian systems. However, as non-Hermitian systems typically conta...
Weight-four parity checks with silicon spin qubits
Brennan Undseth, Nicola Meggiato, Yi-Hsien Wu +7 more·Jan 30, 2026
Recent advances in coherent spin shuttling have made sparse semiconductor spin qubit arrays an appealing solid-state platform to realize quantum processors. The dynamic and long-range connectivity enabled by shuttling is also essential for many quant...
High-gain effects in broadband continuous-wave parametric down conversion sources and measurements with undetected photons
Martin Houde, Franz Roeder, Christine Silberhorn +2 more·Jan 30, 2026
We study theoretically how high-gain effects affect the measurement outcome of visible signal spectra in undetected photon measurement schemes. We consider two interferometric configurations: firstly, the SU(1,1) interferometer where the idler incurs...
Complete Hierarchies for the Geometric Measure of Entanglement
Lisa T. Weinbrenner, Albert Rico, Kenneth Goodenough +2 more·Jan 30, 2026
In quantum physics, multiparticle systems are described by quantum states acting on tensor products of Hilbert spaces. This product structure leads to the distinction between product states and entangled states; moreover, one can quantify entanglemen...
Entanglement Hamiltonians in dissipative free fermions and the time-dependent GGE
Riccardo Travaglino, Federico Rottoli, Pasquale Calabrese·Jan 30, 2026
We investigate the dynamics of Entanglement Hamiltonians (EHs) in dissipative free-fermionic systems using a recent operator-based formulation of the quasiparticle picture. Focusing on gain and loss dissipation, we study the post-quench evolution and...
Compact U(1) Lattice Gauge Theory in Superconducting Circuits with Infinite-Dimensional Local Hilbert Spaces
J. M. Alcaine-Cuervo, S. Pradhan, E. Rico +2 more·Jan 30, 2026
We propose a superconducting-circuit architecture that realizes a compact U(1) lattice gauge theory using the intrinsic infinite-dimensional Hilbert space of phase and charge variables. The gauge and matter fields are encoded directly in the degrees ...
Spontaneous four-wave mixing in a thin layer with second-order nonlinearity
Changjin Son, Maria Chekhova·Jan 30, 2026
Pairs of entangled photons are crucial for photonic quantum technologies. The demand for integrability and multi-functionality suggests 'flat' platforms - ultrathin layers and metasurfaces - as sources of photon pairs. With the success in demonstrati...
Free encoding capacity: A universal unit for quantum resources
Shampa Mondal, Soumajit Das, Preeti Parashar +1 more·Jan 30, 2026
A perfect d-dimensional quantum channel can convey log d-bits of classical information by encoding messages in d-orthogonal quantum states. Alternatively, for every quantum state at the senders end, there exist d-encoding operations which produce d-o...