Papers
Live trends in quantum computing research, updated daily from arXiv.
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Quantum Chaos in Many-Body Systems Without a Classical Analogue
Fotis I. Giasemis·Mar 20, 2026
In classical systems, chaos is clearly defined via the behavior of trajectories. In quantum systems with a classical analogue one finds that the transition from regular to chaotic dynamics is signified by a change in the spectral statistics. This has...
Existence, structure, and properties of quantum-like states
Gregory D. Scholes·Mar 20, 2026
The main purpose of thispaper is to show that composite quantum-like (QL) systems can closely mimic the separable states of quantum systems, and that suitable physical systems exhibiting these states exist. It is shown that QL graphs can closely emul...
Pulsed two-photon scattering from a single atom in a waveguide with delay-modified temporal correlations
Matthew Kozma, Sofia Arranz Regidor, Stephen Hughes·Mar 20, 2026
Quantum nonlinearity is an essential ingredient for many quantum technologies, but often the nonlinearity is too weak to be exploited at the few-photon level. However, few photons interacting strongly with single quantum emitters in a waveguide envir...
Interference of a chain of Bose condensates in the Pitaevskii-Gross approximation
I. N. Mosaki, A. V. Turlapov·Mar 20, 2026
A long chain of Bose condensates freely expands and interferes after being released from an optical lattice. The interference fringes are well resolved both in the case of equal phases of the condensates and in the case of fluctuating phases. In the ...
Order in the interference of a long chain of Bose condensates with unrestricted phases
Vasiliy Makhalov, Andrey Turlapov·Mar 20, 2026
For a long periodic chain of Bose condensates prepared in the free space, the subsequent evolution and interference dramatically depend on the difference between the phases of the adjacent and more distant condensates. If the phases are equal, the in...
Quantum Entanglement Assistance Improves the Capacity and Activates the Zero-Error Capacity of Classical Channels with Causal CSIT
Yuhang Yao, Syed A. Jafar·Mar 20, 2026
For classical point-to-point channels, it has been shown by Bennett et al. that quantum entanglement assistance cannot improve their capacity, and by Cubitt et al. that entanglement assistance cannot activate (increase from zero to non-zero) their ze...
Optimizing photon-number distributions of Gaussian states in the presence of loss: Towards minimizing the impact of loss in Gaussian boson sampling
Hendrik Ellenberg, René Sondenheimer·Mar 20, 2026
We analyze the impact of photon loss on the photon-number statistics of Gaussian states. Specifically, we propose and carefully evaluate several methods to mitigate deviations in the photon-number distributions of lossy (displaced) squeezed vacuum st...
Noise-induced contraction of MPO truncation errors in noisy random circuits and Lindbladian dynamics
Zhi-Yuan Wei, Joel Rajakumar, Jon Nelson +3 more·Mar 20, 2026
We study how matrix-product-operator (MPO) truncation errors evolve when simulating two setups: (1) 1D Haar-random circuits under either depolarizing noise or amplitude-damping noise, and (2) 1D Lindbladian dynamics of a non-integrable quantum Ising ...
Can Quantum Field Theory be Recovered from Time-Symmetric Stochastic Mechanics? Part I: Generalizing the Liouville Equation
Simon Friederich, Mritunjay Tyagi·Mar 20, 2026
We explore whether quantum field theory can be understood as the statistical mechanics of a time-reversal-invariant stochastic generalization of Hamiltonian dynamics. The motivation for this project, started with this paper, is to assign sharp values...
Security of Binary-Modulated Optical Key Distribution Against Quantum-Enhanced Coherent Eavesdropping
Karol Łukanowski, Michał Wójcik, Stefano Olivares +2 more·Mar 20, 2026
Optical key distribution (OKD) protects the physical layer of communication links by taking advantage of the inherent noise present in the photodetection process. It allows for efficient generation of a shared random key between two distant users whi...
Non-Hermitian Disordered Systems
Kohei Kawabata, Shinsei Ryu·Mar 20, 2026
Non-Hermitian disordered systems have emerged as a central arena in modern physics, with ramifications spanning condensed matter, quantum, statistical, and high energy contexts. The same principles also underlie phenomena beyond physics, such as netw...
Parameter-optimal unitary synthesis with flag decompositions
Korbinian Kottmann, David Wierichs, Guillermo Alonso-Linaje +1 more·Mar 20, 2026
We introduce the flag decomposition as a central tool for unitary synthesis. It lets us carve out a diagonal unitary with $2^n$ degrees of freedom in such a way that the remaining flag circuit is parametrized by the optimal number of $4^n-2^n$ rotati...
One-to-one quantum simulation of the low-dimensional frustrated quantum magnet TmMgGaO$_4$ with 256 qubits
Lucas Leclerc, Sergi Julià-Farré, Gabriel Silva Freitas +33 more·Mar 20, 2026
Low-dimensional materials exhibit exotic properties due to enhanced quantum fluctuations, making the understanding of their microscopic origin central in condensed matter physics. Analogue quantum simulators offer a powerful approach for investigatin...
Error-Correction Transitions in Finite-Depth Quantum Channels
Arman Sauliere, Guglielmo Lami, Pedro Ribeiro +2 more·Mar 20, 2026
We study error correction type protocols in which a quantum channel encodes logical information into an enlarged Hilbert space. Specifically, we consider channels realized by one dimensional random noisy quantum circuits with spatially local interact...
Certified Quantum Schrödinger Control via Hierarchical Tucker Models
Nahid Binandeh Dehaghani, Rafal Wisniewski, A. Pedro Aguiar·Mar 20, 2026
High-dimensional Schrödinger systems arising from tensor-product discretizations suffer from exponential state growth, making direct controller synthesis and real-time closed-loop simulation computationally challenging. Hierarchical Tucker (HT) tenso...
Quantum inference on a classically trained quantum extreme learning machine
Emanuele Brusaschi, Marco Clementi, Marco Liscidini +3 more·Mar 20, 2026
Quantum extreme learning machines (QELMs) are unconventional computing architectures that bear remarkable promise in both classical and quantum machine-learning tasks, such as the estimate of quantum state properties. However, the probabilistic natur...
Heisenberg-scaling characterization of an arbitrary two-channel network via two-port homodyne detection
Atmadev Rai, Paolo Facchi, Vincenzo Tamma·Mar 20, 2026
We present a fully Gaussian and experimentally feasible scheme for the simultaneous estimation of the four real parameters that characterize an arbitrary two-channel unitary transformation. The scheme utilizes a two-mode squeezed probe and balanced h...
Analyzing Decoders for Quantum Error Correction
Abtin Molavi, Feras Saad, Aws Albarghouthi·Mar 20, 2026
Quantum error correction (QEC) enables reliable computation on noisy hardware by encoding logical information across many physical qubits and periodically measuring parities to detect errors. A decoder is the classical algorithm that uses these measu...
Micromagnetic Modeling of Surface Acoustic Wave Driven Dynamics: Interplay of Strain, Magnetorotation, and Magnetic Anisotropy
Florian Millo, Pauline Rovillain, Massimiliano Marangolo +1 more·Mar 20, 2026
We study the coupling mechanism of surface acoustic waves (SAW) with spin waves (SW) using micromagnetic analysis. The SAW magnetoacoustic excitation field is fully implemented, i.e., all strain and lattice-rotation terms are included. A realistic Co...
Koopman and transfer operator techniques from the perspective of quantum theory
Dimitrios Giannakis, Michael Montgomery·Mar 20, 2026
The study of mathematical connections between operator-theoretic formulations of classical dynamics and quantum mechanics began at least as early as the 1930s in work of Koopman and von Neumann and was developed in later decades by many authors, ofte...