Papers
Live trends in quantum computing research, updated daily from arXiv.
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Intermodal quantum key distribution over an 18 km free-space channel with adaptive optics and room-temperature detectors
Edoardo Rossi, Ilektra Karakosta-Amarantidou, Matteo Padovan +9 more·Feb 18, 2026
Intermodal quantum key distribution at telecom wavelengths provides a hybrid interface between fiber connections and free-space links, both essential for the realization of scalable and interoperable quantum networks. Although demonstrated over short...
Exponential concentration of fluctuations in mean-field boson dynamics
Matias Gabriel Ginzburg, Simone Rademacher, Giacomo De Palma·Feb 18, 2026
We study the mean-field dynamics of a system of $N$ interacting bosons starting from an initially condensated state. For a broad class of mean-field Hamiltonians, including models with arbitrary bounded interactions and models with unbounded interact...
Amplification of bosonic interactions through squeezing in the presence of decoherence
Ankit Tiwari, Cecilia Cormick, Christian Arenz·Feb 18, 2026
We consider the amplification of bosonic interactions through parametric control that implements squeezing along orthogonal quadratures. We show that bosonic interactions described by certain classes of quadratic and quartic Hamiltonians can be enhan...
Beyond the Classical Ceiling: Multi-Layer Fully-Connected Variational Quantum Circuits
Howard Su, Chen-Yu Liu, Samuel Yen-Chi Chen +2 more·Feb 18, 2026
Standard Variational Quantum Circuits (VQCs) struggle to scale to high-dimensional data due to the ``curse of dimensionality,'' which manifests as exponential simulation costs ($\mathcal{O}(2^d)$) and untrainable Barren Plateaus. Existing solutions o...
Bichromatic Quantum Teleportation of Weak Coherent Polarization States on a Metropolitan Fiber
Zofia A. Borowska, Shane Andrewski, Giorgio De Pascalis +12 more·Feb 18, 2026
As quantum technologies mature, telecommunication operators have a clear opportunity to unlock and scale new services by providing the connectivity layer that links quantum computers, sensors, clocks, and other quantum devices. Realizing this opportu...
Causal and Compositional Abstraction
Robin Lorenz, Sean Tull·Feb 18, 2026
Abstracting from a low level to a more explanatory high level of description, and ideally while preserving causal structure, is fundamental to scientific practice, to causal inference problems, and to robust, efficient and interpretable AI. We presen...
Entanglement negativity in decohered topological states
Kang-Le Cai, Meng Cheng·Feb 18, 2026
We investigate universal entanglement signatures of mixed-state phases obtained by decohering pure-state topological order (TO), focusing on topological corrections to logarithmic entanglement negativity and mutual information: topological entangleme...
On the Coupled Cluster Doubles Truncation Variety of Four Electrons
Fabian M. Faulstich, Vincenzo Galgano, Elke Neuhaus +1 more·Feb 18, 2026
We extend recent algebro-geometric results for coupled cluster theory of quantum many-body systems to the truncation varieties arising from the doubles approximation (CCD), focusing on the first genuinely nonlinear doubles regime of four electrons. S...
Quantum Cellular Automata: The Group, the Space, and the Spectrum
Mattie Ji, Bowen Yang·Feb 18, 2026
Over an arbitrary commutative ring $R$, we develop a theory of quantum cellular automata. We then use algebraic K-theory to construct a space $\mathbf{Q}(X)$ of quantum cellular automata (QCA) on a given metric space $X$. In most cases of interest, $...
Illustration of Barren Plateaus in Quantum Computing
Gerhard Stenzel, Tobias Rohe, Michael Kölle +3 more·Feb 18, 2026
Variational Quantum Circuits (VQCs) have emerged as a promising paradigm for quantum machine learning in the NISQ era. While parameter sharing in VQCs can reduce the parameter space dimensionality and potentially mitigate the barren plateau phenomeno...
MerLean: An Agentic Framework for Autoformalization in Quantum Computation
Yuanjie Ren, Jinzheng Li, Yidi Qi·Feb 18, 2026
We introduce MerLean, a fully automated agentic framework for autoformalization in quantum computation. MerLean extracts mathematical statements from \LaTeX{} source files, formalizes them into verified Lean~4 code built on Mathlib, and translates th...
Quantum Estimation Theory Limits in Neutrino Oscillation Experiments
Claudia Frugiuele, Marco G. Genoni, Michela Ignoti +1 more·Feb 18, 2026
Measurements of the Pontecorvo-Maki-Nakagawa-Sakata (PMNS) neutrino mixing parameters have entered a precision era, enabling increasingly stringent tests of neutrino oscillations. Within the framework of quantum estimation theory, we investigate whet...
Reinforcement Learning for Parameterized Quantum State Preparation: A Comparative Study
Gerhard Stenzel, Isabella Debelic, Michael Kölle +4 more·Feb 18, 2026
We extend directed quantum circuit synthesis (DQCS) with reinforcement learning from purely discrete gate selection to parameterized quantum state preparation with continuous single-qubit rotations \(R_x\), \(R_y\), and \(R_z\). We compare two traini...
Port-based teleportation under pure-dephasing decoherence
Rajendra S. Bhati, Michał Studziński, Jarosław K. Korbicz·Feb 18, 2026
We study deterministic port based teleportation in the presence of noise affecting both the entangled resource state and the measurement process. We focus on a physically motivated model in which each Bell pair constituting the resource interacts wit...
Nonequilibrium Casimir-Polder Force: Motion-induced Thermal-like Effect
D. Reiche, B. Beverungen, K. Busch +1 more·Feb 18, 2026
The Casimir-Polder force is analyzed when an atom is moving at a constant velocity relative to a collection of translationally invariant macroscopic bodies with generic shapes and compositions. The interaction is described within an approach that acc...
Quantitative study of Silicon Waveguides for the Generation of Quantum Correlated Photon Pairs Bridging Mid-Infrared and Telecom Bands
Abhishek Kumar Pandey, Deepak Jain, Catherine Baskiotis·Feb 18, 2026
Sources of quantum correlated photons pairs bridging the 3um-4um Mid-infrared (MIR) band and Telecom/Near-Infrared/Visible band are of high importance for quantum technologies. Spontaneous Parametric Down Conversion is generally used for realizing su...
Edge states and quantum optical high-harmonic generation from topological insulators
Christian Saugbjerg Lange, Lars Bojer Madsen·Feb 18, 2026
The strong-field process of high-harmonic generation (HHG) has, in recent years, been treated from a quantum optical perspective in the emerging research area of strong-field quantum optics. These investigations show that HHG radiation is, in general...
Nonlocal prediction of quantum measurement outcomes
Chirag Srivastava, Aparajita Bhattacharyya, Ujjwal Sen·Feb 18, 2026
We define nonlocal predictability as how well one observer can predict another's measurement outcomes without classical communication, given full knowledge of the shared quantum state and measurement settings. The local bound on nonlocal predictabili...
Measurement Induced Subradiance
Ipsita Bar, Aditi Thakar, B. Prasanna Venkatesh·Feb 18, 2026
Preparing subradiant steady states of collectively emitting quantum two-level emitters (TLEs) is hindered by their dark, weakly interacting nature. Existing approaches rely on patterned driving, local control, or structured environments. We propose a...
Enhancing delocalization and entanglement in asymmetric discrete-time quantum walks
Hao Zhao, Qiyan He, Fengzhi Yang +8 more·Feb 18, 2026
In this paper, we investigate the enhancement of delocalization and coin-position entanglement in asymmetric discrete-time quantum walks (DTQWs). The asymmetry results from asymmetric coin operations, asymmetric initial states, and asymmetric polariz...