Papers
Live trends in quantum computing research, updated daily from arXiv.
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Phase-sensitive representation of Majorana stabilizer states
Tomislav Begušić, Garnet Kin-Lic Chan·Feb 19, 2026
Stabilizer states hold a special place in quantum information science due to their connection with quantum error correction and quantum circuit simulation. In the context of classical simulations of many-body physics, they are an example of states th...
Measuring spectral functions of doped magnets with Rydberg tweezer arrays
Romain Martin, Mu Qiao, Ivan Morera +8 more·Feb 19, 2026
Spectroscopic measurements of single-particle spectral functions provide crucial insight into strongly correlated quantum matter by resolving the energy and spatial structure of elementary excitations. Here we introduce a spectroscopic protocol for s...
Quantum Advantage for Sensing Properties of Classical Fields
Jordan Cotler, Daine L. Danielson, Ishaan Kannan·Feb 19, 2026
Modern precision experiments often probe unknown classical fields with bosonic sensors in quantum-noise-limited regimes where vacuum fluctuations limit conventional readout. We introduce Quantum Signal Learning (QSL), a sensing framework that extends...
States that grow linearly in time, exceptional points, and zero norm states in the simple harmonic oscillator
Philip D. Mannheim·Feb 19, 2026
The simple harmonic oscillator has a well-known normalizable, positive energy, bound state spectrum. We show that degenerate with each such positive energy eigenvalue there is a non-normalizable positive energy eigenstate whose eigenfunction is ortho...
Subluminal and superluminal velocities of free-space photons
Konstantin Y. Bliokh·Feb 19, 2026
We consider rectilinear free-space propagation of electromagnetic wavepackets using electromagnetic field theory, scalar wavepacket propagation, and quantum-mechanical formalism. We demonstrate that spatially localized wavepackets are inherently char...
Efficiency of classical simulations of a noisy Grover algorithm
Raphaël Menu, Johannes Schachenmayer·Feb 19, 2026
We analyze the modification of entanglement dynamics in the Grover algorithm when the qubits are subjected to single-qubit amplitude-damping or phase-flip noise. We compare quantum trajectories with full density-matrix simulations, analyzing the dyna...
Phase transitions in quasi-Hermitian quantum models at exceptional points of order four
Miloslav Znojil·Feb 19, 2026
Quantum phase transition is interpreted as an evolution, at the end of which a parameter-dependent Hamiltonian $H(g)$ loses its observability. In the language of mathematics, such a quantum catastrophe occurs at an exceptional point of order $N$ (EPN...
Pauli Correlation Encoding for Budget-Constrained Optimization
Jacobo Padín-Martínez, Vicente P. Soloviev, Alejandro Borrallo-Rentero +3 more·Feb 19, 2026
Quantum optimization has gained increasing attention as advances in quantum hardware enable the exploration of problem instances approaching real-world scale. Among existing approaches, variational quantum algorithms and quantum annealing dominate cu...
A dimension-independent strict submultiplicativity for the transposition map in diamond norm
Hyunho Cha·Feb 19, 2026
We prove that there exists an absolute constant $α<1$ such that for every finite dimension $d$ and every quantum channel $T$ on $\mathsf{L}(\mathbb{C}^d)$, $\left\|Θ\circ(\mathrm{id}-T)\right\|_\diamond \le α\,\left\|Θ\right\|_\diamond\,\left\|\mathr...
Simulating quantum measurements without using superposition
Gabriele Cobucci, Alexander Bernal, Roope Uola +1 more·Feb 19, 2026
Superposition is the core feature that sets quantum theory apart from classical physics. Here, we investigate whether sets of quantum measurements can be modelled by using only devices that are operationally classical, in the sense that they have no ...
Single-Photon Motion in a Two-Dimensional Plane: Confinement and Boundary Escape
Hui-hui Miao·Feb 19, 2026
This paper investigates the motion of a single photon in a two-dimensional plane under closed and open boundary conditions. We employ two methods to construct the Hilbert space: Method A, based on the standard second-quantization formalism, and Metho...
A Programmable Linear Optical Quantum Reservoir with Measurement Feedback for Time Series Analysis
Çağın Ekici·Feb 19, 2026
Feedback-driven quantum reservoir computing has so far been studied primarily in gate-based architectures, motivating alternative scalable, hardware-friendly physical platforms. Here we investigate a linear-optical quantum reservoir architecture for ...
Global bifurcations and basin geometry of the nonlinear non-Hermitian skin effect
Heng Lin, Yunyao Qi, Gui-Lu Long·Feb 19, 2026
We study a continuum Hatano--Nelson model with a saturating nonlinear nonreciprocity and analyze its stationary states via the associated phase-space flow. We uncover a global scenario controlled by a subcritical Hopf bifurcation and a saddle-node of...
Fault-tolerant preparation of arbitrary logical states in the cat code
Zi-Jie Chen, Weizhou Cai, Liang-Xu Xie +5 more·Feb 19, 2026
Preparing high-fidelity logical states is a central challenge in fault-tolerant quantum computing, yet existing approaches struggle to balance control complexity against resource overhead. Here, we present a complete framework for the fault-tolerant ...
Matrix-product operator dualities in integrable lattice models
Yuan Miao, Andras Molnar, Nick G. Jones·Feb 19, 2026
Matrix-product operators (MPOs) appear throughout the study of integrable lattice models, notably as the transfer matrices. They can also be used as transformations to construct dualities between such models, both invertible (including unitary) and n...
Tight any-shot quantum decoupling
Mario Berta, Hao-Chung Cheng, Yongsheng Yao·Feb 19, 2026
Quantum information decoupling is a fundamental primitive in quantum information theory, underlying various applications in quantum physics. We prove a novel one-shot decoupling theorem formulated in terms of quantum relative entropy distance, with t...
Organic molecules as single-photon sources
Alexey Shkarin, Stephan Götzinger·Feb 19, 2026
The development of single-photon sources has been nothing but rapid in recent years, with quantum emitter-based systems showing especially impressive progress. In this article, we give an overview of the developments in single-photon sources based on...
Mott-insulating phases of the Bose-Hubbard model on quasi-1D ladder lattices
Lorenzo Carfora, Callum W. Duncan, Stefan Kuhr +1 more·Feb 19, 2026
We calculate the phase diagram of the Bose-Hubbard model on a half-filled ladder lattice including the effect of finite on-site interactions. This shows that the rung-Mott insulator (RMI) phase persists to finite interaction strength, and we calculat...
Experimental certification of ensembles of high-dimensional quantum states with independent quantum devices
Yong-Nan Sun, Meng-Yun Ma, Qi-Ping Su +3 more·Feb 19, 2026
When increasing the dimensionality of quantum systems, high-dimensional quantum state certification becomes important in quantum information science and technology. However, how to certify ensembles of high-dimensional quantum states in a black-box s...
Quantifying non-Markovianity in magnetization dynamics via entropy production rates
Felix Hartmann, Finja Tietjen, R. Matthias Geilhufe +1 more·Feb 19, 2026
Magnetization dynamics is commonly described by the stochastic Landau-Lifshitz-Gilbert (LLG) equation. On picosecond timescales, inertial and open-system extensions of the LLG equation are necessary to interpret recent experiments. We show analytical...