Papers
Live trends in quantum computing research, updated daily from arXiv.
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On the emergence of quantum mechanics from stochastic processes
Jason Doukas·Feb 25, 2026
The stochastic--quantum correspondence reinterprets quantum dynamics as arising from an underlying stochastic process on a configuration space. We generalize the correspondence by lifting an arbitrary stochastic kernel $Γ$ in finite dimension to a ma...
Learning Quantum Data Distribution via Chaotic Quantum Diffusion Model
Quoc Hoan Tran, Koki Chinzei, Yasuhiro Endo +1 more·Feb 25, 2026
Generative models for quantum data pose significant challenges but hold immense potential in fields such as chemoinformatics and quantum physics. Quantum denoising diffusion probabilistic models (QuDDPMs) enable efficient learning of quantum data dis...
Quantum tomography for non-iid sources
Leonardo Zambrano·Feb 25, 2026
Quantum state and process tomography are typically analyzed under the assumption that devices emit independent and identically distributed (i.i.d.) states or channels. In realistic experiments, however, noise, drift, feedback, or adversarial behavior...
Correlated inhomogeneous absorption profiles across distinct optical transitions in a rare-earth doped crystal
Flora Segur, Sacha Welinski, Alban Ferrier +2 more·Feb 25, 2026
In rare-earth ion-doped crystals, inhomogeneous absorption profiles reflect the distribution of local environments experienced by individual ions. While each optical transition probes this distribution differently, their fine spectral structures may ...
Quantum criticality in open quantum systems from the purification perspective
Yuchen Guo, Shuo Yang·Feb 25, 2026
Open quantum systems host mixed-state phases that go beyond the symmetry-protected topological and spontaneous symmetry-breaking paradigms established for closed, pure-state systems. Developing a unified and physically transparent classification of s...
Noise-adaptive hybrid quantum convolutional neural networks based on depth-stratified feature extraction
Taehyun Kim, Israel F. Araujo, Daniel K. Park·Feb 25, 2026
Hierarchical quantum classifiers, such as quantum convolutional neural networks (QCNNs), represent recent progress toward designing effective and feasible architectures for quantum classification. However, their performance on near-term quantum hardw...
Prodiabatic Elimination: Higher Order Elimination of Fast Variables with Quantum Noise
Jan Neuser, Marcelo Janovitch, Matteo Brunelli +1 more·Feb 25, 2026
We introduce the prodiabatic elimination, a powerful approximation technique that systematically extends the adiabatic elimination of fast degrees of freedom in light-matter coupled systems. Through a controlled expansion of operators, the prodiabati...
Analysis of the action of conventional trapped-ion entangling gates in qudit space
Pavel Kamenskikh, Nikita Semenin, Ilia Zalivako +4 more·Feb 25, 2026
Qudits, or multi-level quantum information carriers, present a promising path for scaling quantum computers. However, their use introduces increased complexity in quantum logic, necessitating careful control of relative phases between different qudit...
Quantum Error Mitigation Simulates General Non-Hermitian Dynamics
Hiroki Kuji, Suguru Endo, Tetsuro Nikuni +2 more·Feb 25, 2026
While non-Hermitian Hamiltonians enable exotic dynamical phenomena, implementing their nonunitary time evolution on near-term quantum devices remains challenging. We propose a hardware-friendly protocol that simulates non-Hermitian dynamics without c...
Deep squeezing or cooling the fluctuations of a parametric resonator using feedback
Adriano A. Batista·Feb 25, 2026
Here we analyze ways to achieve deep subthreshold parametric squeezing or cooling of a single degree-of-freedom parametric resonator enhanced by a lock-in amplifier feedback loop. Due to the feedback, the dynamics of the parametric resonator becomes ...
Generating large-scale Greenberger-Horne-Zeilinger-like states in lattice spin systems
Xuanchen Zhang, Yaofeng Chen, Yong-Chun Liu·Feb 25, 2026
Greenberger-Horne-Zeilinger (GHZ) state is a typical maximally entangled state which is pursued in both fundamental research and emerging quantum technologies. Preparing large-scale GHZ states in lattice spin systems is particularly appealing for qua...
Imperfect Graphs from Unitary Matrices -- I
Wesley Lewis, Darsh Pareek, Umesh Kumar +1 more·Feb 25, 2026
Matrix representations of quantum operators are computationally complete but often obscure the structural topology of information flow within a quantum circuit \cite{nielsen2000}. In this paper, we introduce a generalized graph-theoretic framework fo...
On some mathematical problems for open quantum systems with varying particle number
Benedikt M. Reible, Luigi Delle Site·Feb 25, 2026
We derive the effective Hamiltonian $H - μN$ for open quantum systems with varying particle number from first principles within the framework of non-relativistic quantum statistical mechanics. We prove that under physically motivated assumptions rega...
Landscape-Similarity-Guided Optimization in QAOA
Sokea Sang, Leanghok Hour, Sanghyeon Lee +4 more·Feb 25, 2026
Across diverse synthetic and real-world interaction graphs, the variational landscapes of reduced Quantum Approximate Optimization Algorithm (QAOA) instances obtained via variable freezing exhibit a robust universality. Leveraging this structure, we ...
Revealing entanglement through local features of phase-space distributions
Elena Callus, Martin Gärttner, Tobias Haas·Feb 25, 2026
We formulate an infinite hierarchy of continuous-variable separability criteria in terms of quasiprobability distributions and their derivatives evaluated at individual points in phase space. Our approach is equivalent to the Peres--Horodecki criteri...
Secret Key Rate Limits in Coexisting Classical-Quantum Optical Links
Lucas Alves Zischler, Amirhossein Ghazisaeidi, Antonio Mecozzi +1 more·Feb 25, 2026
Classical-quantum coexistence enables cost-effective transmission of data and quantum signals over the same fiber-optic channel. Nevertheless, weak quantum-key distribution (QKD) signals are susceptible to non-linear interference generated from the c...
Tuning Wave-Particle Duality of Quantum Light by Generalized Photon Subtraction
Kan Takase, Mamoru Endo, Fumiya Hanamura +11 more·Feb 25, 2026
Wave--particle duality is a hallmark of quantum mechanics. For bosonic systems, there exists a continuum of intermediate states bridging wave-like Schrödinger cat states and particle-like Fock states. Such states have recently been recognized as valu...
Entanglement recovery by reversing the effect of noise in quantum repeater
Sewon Jeong, Shrobona Bagchi, Jaehak Lee +4 more·Feb 25, 2026
We propose a method to directly recover the degree of entanglement distributed by entanglement swapping in the presence of noise. Our approach introduces a reversing operation that probabilistically undoes the effect of amplitude damping or photon lo...
Performance Comparison of QAOA Mixers for Ternary Portfolio Optimization
Shintaro Yamamura, Satoshi Watanabe, Masaya Kunimi +2 more·Feb 25, 2026
The Quantum Approximate Optimization Algorithm (QAOA) is a quantum algorithm proposed for Noisy Intermediate-Scale Quantum (NISQ) devices and is regarded as a promising approach to combinatorial optimization problems, with potential applications in t...
Passive Environment-Assisted Quantum Communication
Evelyn Voss, Bikun Li, Zhaoyou Wang +1 more·Feb 25, 2026
As quantum information systems mature, efficient and coherent transfer of quantum information through noisy channels becomes increasingly important. We examine how passive environment-assisted quantum communication enhances direct quantum information...