Papers
Live trends in quantum computing research, updated daily from arXiv.
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The trouble with recording devices
Eric Tesse·Feb 2, 2026
Quantum theory encounters a difficulty when attempting to describe recording devices. If the recording is of events in which quantum uncertainty plays a role, such as an experiment on a quantum system, quantum theory is unable to correctly predict th...
AQER: a scalable and efficient data loader for digital quantum computers
Kaining Zhang, Xinbiao Wang, Yuxuan Du +2 more·Feb 2, 2026
Digital quantum computing promises to offer computational capabilities beyond the reach of classical systems, yet its capabilities are often challenged by scarce quantum resources. A critical bottleneck in this context is how to load classical or qua...
Towards Ultimate Accuracy in Quantum Multi-Class Classification: A Trace-Distance Binary Tree AdaBoost Classifier
Xin Wang, Yabo Wang, Rebing Wu·Feb 2, 2026
We propose a Trace-distance binary Tree AdaBoost (TTA) multi-class quantum classifier, a practical pipeline for quantum multi-class classification that combines quantum-aware reductions with ensemble learning to improve trainability and resource effi...
A Schwinger-Keldysh Formulation of Semiclassical Operator Dynamics
Jeff Murugan, Hendrik J. R. van Zyl·Feb 2, 2026
In this work we develop a real-time Schwinger-Keldysh formulation of Krylov dynamics that treats Krylov complexity as an in-in observable generated by a closed time contour path integral. The resulting generating functional exposes an emergent phase-...
Microscopic simulations of the coupled dynamics of cavity photons, excitons, and biexcitons
Hendrik Rose, Stefan Schumacher, Torsten Meier·Feb 2, 2026
The coherent interaction between quantum light and material excitations in semiconductor nanostructures is investigated using a fully quantized microscopic approach that incorporates many-body Coulomb correlations. The simulations demonstrate that th...
Quantum clock and Newtonian time
Dorje C. Brody, Lane P. Hughston·Feb 2, 2026
An extension of standard quantum mechanics is proposed in which the Newtonian time appearing as a parameter in the unitary evolution operator is replaced with the time shown by a `quantum clock'. Such a clock is defined by the following properties: (...
The soliton nature of the super-Klein tunneling effect
Francisco Correa, Luis Inzunza, Olaf Lechtenfeld·Feb 2, 2026
We establish a relationship between the Davey--Stewartson II (DS II) integrable system in $(2{+}1)$ dimensions and quasi-exactly solvable planar interacting Dirac Hamiltonians that exhibit the super-Klein tunneling (SKT) effect. The Dirac interaction...
On the reality of quantum states: A pedagogic survey from classical to quantum mechanics
Moncy Vilavinal John·Feb 2, 2026
Some recent experiments claim to show that any model in which a quantum state represents mere information about an underlying physical reality of the system must make predictions which contradict those of quantum theory. The present work undertakes t...
On Quantum Learning Advantage Under Symmetries
Tuyen Nguyen, Mária Kieferová, Amira Abbas·Feb 2, 2026
Symmetry underlies many of the most effective classical and quantum learning algorithms, yet whether quantum learners can gain a fundamental advantage under symmetry-imposed structures remains an open question. Based on evidence that classical statis...
Position: The Need for Ultrafast Training
Duc Hoang·Feb 2, 2026
Domain-specialized FPGAs have delivered unprecedented performance for low-latency inference across scientific and industrial workloads, yet nearly all existing accelerators assume static models trained offline, relegating learning and adaptation to s...
Scalable Quantum-Classical DFT Embedding for NISQ Molecular Simulation
Namrata Manglani, Samrit Kumar Maity, Ranjit Thapa +1 more·Feb 2, 2026
Scalable quantum-classical embedding is essential for chemically meaningful simulations on near-term NISQ hardware. Using QDFT, we show systematic recovery of correlation energy relative to the DFT baseline, benchmarked against CCSD in a fixed six-or...
Real-time detection of correlated quasiparticle tunneling events in a multi-qubit superconducting device
Simon Sundelin, Linus Andersson, Hampus Brunander +1 more·Feb 2, 2026
Quasiparticle tunneling events are a source of decoherence and correlated errors in superconducting circuits. Understanding and ultimately mitigating these errors calls for real-time detection of quasiparticle tunneling events on individual devices. ...
Universal scaling of finite-temperature quantum adiabaticity in driven many-body systems
Li-Ying Chou, Jyong-Hao Chen·Feb 2, 2026
Establishing quantitative adiabaticity criteria at finite temperature remains substantially less developed than in the pure-state setting, even though realistic quantum systems are never at absolute zero. Here, by combining a mixed-state quantum spee...
Exceptional phase transition in a single Kerr-cat qubit
Pei-Rong Han, Tian-Le Yang, Wen Ning +4 more·Feb 2, 2026
Exceptional points in non-Hermitian quantum systems give rise to novel genuine quantum phenomena. Recent explorations of exceptional-point-induced quantum phase transitions have extended from discrete-variable to continuous-variable-encoded quantum s...
Numerical Error Extraction by Quantum Measurement Algorithm
Clement Ronfaut, Robin Ollive, Stephane Louise·Feb 2, 2026
Important quantum algorithm routines allow the implementation of specific quantum operations (a.k.a. gates) by combining basic quantum circuits with an iterative structure. In this structure, the number of repetitions of the basic circuit pattern is ...
Quantum vortex channels as Josephson junctions
Natalia Masalaeva, Wyatt Kirkby, Francesca Ferlaino +1 more·Feb 2, 2026
In quantum gases, weak links are typically realized with externally imposed optical potentials. We show that, in rotating binary condensates, quantized vortices in one component form hollow channels that act as self-induced weak links for the other, ...
Spin-orbit-dependent lifetimes of long-range Rydberg molecules
Michael Peper, Jakob Skrotzki, Martin Trautmann +2 more·Feb 2, 2026
Long-range Rydberg molecules (LRMs) form when a highly excited Rydberg electron scatters from ground-state atoms inside its orbit, creating oscillatory, long-range potentials. We present a combined theoretical and experimental study of caesium dimers...
Quantum Circuit Representation of Bosonic Matrix Functions
Minhyeok Kang, Gwonhak Lee, Youngrong Lim +1 more·Feb 2, 2026
Bosonic counting problems can be framed as estimation tasks of matrix functions such as the permanent, hafnian, and loop-hafnian, depending on the underlying bosonic network. Remarkably, the same functions also arise in spin models, including the Isi...
Finite-Size Scaling of the Full Eigenstate Thermalization in Quantum Spin Chains
Yuke Zhang, Pengfei Zhang·Feb 2, 2026
Despite the unitary evolution of closed quantum systems, long-time expectation of local observables are well described by thermal ensembles, providing the foundation of quantum statistical mechanics. A promising route to understanding this quantum th...
Semidefinite programming for understanding limitations of Lindblad equations
Soumyadeep Sarma, Manas Kulkarni, Archak Purkayastha +1 more·Feb 2, 2026
Lindbladian quantum master equations (LEs) are the most popular descriptions for quantum systems weakly coupled to baths. But, recent works have established that in many situations such Markovian descriptions are fundamentally limited: they cannot si...