Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Long-range waveguide-quantum electrodynamics with left-handed transmission lines
P. Goswami, J. Liu, C. A. González-Gutiérrez +1 more·Mar 4, 2026
While engineering long-range light-matter interactions is the principal aim in waveguide-QED, ironically most of the building blocks rest on local short-range couplings, such as nearest-neighbor-coupled cavity arrays employed in canonical models. Her...
High Purity OAM Entangled Photons from SPDC with Reduced Spatial Spectral Correlations
F. Crislane V. de Brito, Sylwia Kolenderska, Piotr Kolenderski·Mar 4, 2026
Entanglement generated by Spontaneous Parametric Down Conversion (SPDC) involves multiple, often mutually correlated degrees of freedom. These degrees of freedom are often treated independently, overlooking the intrinsic correlation between them. We ...
Dirac Wave Functions of Positive Energy with Arbitrarily Small Position Uncertainty
Ilmar Bürck, Roderich Tumulka·Mar 4, 2026
We consider wave functions in the Hilbert space $\mathcal{H}=L^2(\mathbb{R}^3,\mathbb{C}^4)$ of a single Dirac particle, specifically from the positive-energy subspace $\mathcal{H}_+$ of the free Dirac Hamiltonian. Over the decades, various authors c...
Necessary conditions for the Markovian Mpemba effect
Ido Avitan, Roee Factor, David Gelbwaser-Klimovsky·Mar 4, 2026
The Mpemba effect is a thermodynamic anomaly in which a system farther away in temperature from equilibrium thermalizes before one that is initially closer. The effect has been experimentally observed across a wide range of systems, including water, ...
Universal Hamiltonian control in a planar trimon circuit
Vivek Maurya, Daria Kowsari, Kumar Saurav +4 more·Mar 4, 2026
Multimode circuits provide an avenue for flexible control of single and multi-qubit gates. In this work we implement a multimode circuit known as a trimon integrated in a planar geometry. The trimon features three transmon-like modes with strong all-...
Demonstrating Noise-adapted Quantum Error Correction With Break-Even Performance
Vismay Joshi, Anubhab Rudra, Sourav Dutta +2 more·Mar 4, 2026
The promise of quantum computing is closer to reality today than ever before, thanks to rapid progress in the development of quantum hardware. Even as qubit lifetimes and gate fidelities continue to improve, realizing robust, fault-tolerant quantum c...
How to improve the accuracy of semiclassical and quasiclassical dynamics with and without generalized quantum master equations
Matthew R. Laskowski, Srijan Bhattacharyya, Andrés Montoya-Castillo·Mar 4, 2026
Semi- and quasi-classical (SC) theories can handle arbitrary interatomic interactions and are thus well-suited to predict quantum dynamics in condensed phases that encode energy and charge transport, spectroscopic responses, and chemical reactivity. ...
Feedback-Induced Advantage in Quantum Clockworks
Jakob Miller, Paul Erker·Mar 4, 2026
Atomic frequency standards have achieved steadily increasing precision over the past seventy years, enabled in part by feedback mechanisms that stabilise their output. In parallel, the timekeeping capabilities of quantum systems have been explored wi...
Transversal AND in Quantum Codes
Christine Li, Lia Yeh·Mar 4, 2026
The AND gate is not reversible$\unicode{x2014}$on qubits. However, it is reversible on qutrits, making it a building block for efficient simulation of qubit computation using qutrits. We first observe that there are multiple two-qutrit Clifford+T uni...
Linear-Time Encodable and Decodable Quantum Error-Correcting Codes
Adam Wills, Ting-Chun Lin, Rachel Yun Zhang +1 more·Mar 4, 2026
Recent years have seen rapid development in the subject of quantum coding theory, with breakthroughs on many exciting classes of codes, including quantum LDPC codes, quantum locally testable codes, and quantum codes with interesting transversal gates...
Tight inapproximability of max-LINSAT and implications for decoded quantum interferometry
Maximilian J. Kramer, Carsten Schubert, Jens Eisert·Mar 4, 2026
We establish tight inapproximability bounds for max-LINSAT, the problem of maximizing the number of satisfied linear constraints over the finite field $\mathbb{F}_q$, where each constraint accepts $r$ values. Specifically, we prove by a direct reduct...
Examination of classical simulations for Heisenberg-Langevin equations for spin-1/2
Scott D. Linz, Jochen Gemmer·Mar 4, 2026
A system of spins coupled to a bath is a traditional setup in open quantum systems. Through Heisenberg's equation, the spin dynamics can be modeled by a set of first-order differential equations. Interpreting the terms as colored noise and non-Markov...
Towards Predictive Quantum Algorithmic Performance: Modeling Time-Correlated Noise at Scale
Amit Jamadagni, Gregory Quiroz, Eugene Dumitrescu·Mar 4, 2026
Combining tensor network techniques with quantum autoregressive moving average models, we quantify the effects of time-correlated noise on quantum algorithms and predict their performance at scale. As a paradigmatic test case, we examine the quantum ...
Markovian quantum master equations are exponentially accurate in the weak coupling regime
Johannes Agerskov, Frederik Nathan·Mar 4, 2026
We consider the evolution of open quantum systems coupled to one or more Gaussian environments. We demonstrate that such systems can be described by a Markovian quantum master equation (MQME) up to a correction that decreases exponentially with the i...
Fundamental Limits on Polarization Entanglement Distribution in Optical Fiber
Stefano Pirandola·Mar 4, 2026
Characterizing the ultimate rates of entanglement distribution is essential for both foundational research and the practical deployment of quantum technologies. To investigate these limits, we introduce an erasure-Pauli channel model describing the d...
Chiral and pair superfluidity in triangular ladder produced by state-dependent Kronig-Penney lattice
Domantas Burba, Giedrius Žlabys, Dzmitry Viarbitski +2 more·Mar 4, 2026
We propose a concrete realization of a triangular ladder for ultracold atoms, which simultaneously hosts geometric frustration and unusual two-body interactions, and in particular controllable pair hopping and density-induced tunneling. This is done ...
Optimal recovery for quantum error correction
Sun Woo P. Kim·Mar 4, 2026
The calculation of the error threshold of quantum error correcting codes typically proceeds as follows. First, syndromes are measured. Then, a decoder infers the error chain and the corresponding correction is applied. The threshold is then defined a...
Quantum State Certification via Effective Parent Hamiltonians from Local Measurement Data
Guy-Philippe Nadon, Guanyi Heng, Pacôme Gasnier +8 more·Mar 4, 2026
The preparation and certification of quantum states is a fundamental challenge across quantum information technology. We introduce a tomography-free state certification method that lower-bounds the fidelity by estimating expectation values of enginee...
Realizing anomalous Floquet non-Abelian band topology in photonic scattering networks
Yuze Hu, Mingyu Tong, Tian Jiang +10 more·Mar 4, 2026
The concept of multi-gap topology has recently been shown to give rise to uncharted phases beyond conventional single-gap classifications. These phases relate to band nodes with non-Abelian quaternion charges and momentum-space braiding processes cha...
Rethinking quantum smooth entropies: Tight one-shot analysis of quantum privacy amplification
Bartosz Regula, Marco Tomamichel·Mar 4, 2026
We introduce an improved one-shot characterisation of randomness extraction against quantum side information (privacy amplification), strengthening known one-shot bounds and providing a unified derivation of the tightest known asymptotic constraints....