Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
A persistent-current-biased and current-actuated switch for superconducting circuits
Ziyi Zhao, Eva Gurra, Michael R. Vissers +1 more·Mar 6, 2026
Broadband and low-loss superconducting switches can facilitate large-scale quantum information processors and cryogenic detectors by dynamically reconfiguring the connectivity of their circuits. The time dependent connectivity is enabled by the nonli...
Completeness for Prime-Dimensional Phase-Affine Circuits
Colin Blake·Mar 6, 2026
Equational reasoning about circuits is central in quantum software for validation, optimisation, and verification. For qubits, the CNOT-dihedral fragment supports efficient rewriting via phase polynomials and layered normal forms, yielding a complete...
AKLT Hamiltonian from Hubbard tripods
Claire Benjamin, Dániel Varjas, Gábor Széchenyi +2 more·Mar 6, 2026
We investigate how the spin-1 Affleck-Kennedy-Lieb-Tasaki (AKLT) Hamiltonian can emerge from a microscopic fermionic model based on half-filled Hubbard tripods. We first show that a single tripod hosts a robust threefold-degenerate low-energy manifol...
Toward Generative Quantum Utility via Correlation-Complexity Map
Chen-Yu Liu, Leonardo Placidi, Eric Brunner +1 more·Mar 6, 2026
We propose a Correlation-Complexity Map as a practical diagnostic tool for determining when real-world data distributions are structurally aligned with IQP-type quantum generative models. Characterized by two complementary indicators: (i) a Quantum C...
Entanglement distribution: To herald or not to herald
Jeffrey H. Shapiro, Clark Embleton, J. Gabriel Richardson·Mar 6, 2026
High-rate, high-fidelity entanglement distribution is essential for the creation of a quantum internet, and spontaneous parametric downconverters (SPDCs) are, at present, the preferred sources of entangled signal-idler photon pairs for transmission t...
New results for Heisenberg dynamics for non self-adjoint Hamiltonians
Fabio Bagarello·Mar 6, 2026
In a previous paper we began our analysis on the role of non self-adjoint Hamiltonians in connection with the Heisenberg dynamics for quantum systems. Here, motivated by the growing interest on this topic and on some recent results on dynamical syste...
Entanglement is not sufficient for most practical entanglement-based QKD protocols
Shubhayan Sarkar, Tushita Prasad, Karol Horodecki·Mar 6, 2026
Quantum key distribution (QKD) is the most explored application of quantum information theory. A central problem in entanglement-based QKD (EB-QKD), is whether every entangled state can be used to extract a key. We observe that entanglement is not su...
Intramolecular nuclear dynamics in intermolecular Coulombic electron capture
Elena M. Jahr, Elke Fasshauer·Mar 6, 2026
We present an analytical model for intermolecular Coulombic electron capture (ICEC) which includes the internal nuclear dynamics of the molecules involved. In ICEC, an electron attaches to an atom or molecule by transferring excess energy to a neighb...
Continuous-variable approximate unitary 2-design, with applications to unclonable encryption
Arpan Akash Ray, Boris Skoric·Mar 6, 2026
We introduce an $\varepsilon$-approximate unitary 2-design that is compatible with the structure of p- and q-quadratures in continuous-variable (CV) quantum systems. The design unitaries are defined on a finite-dimensional discretisation of the CV sp...
Quantum Hamlets: Distributed Compilation of Large Algorithmic Graph States
Anthony Micciche, Naphan Benchasattabuse, Andrew McGregor +3 more·Mar 6, 2026
We investigate the problem of compiling the generation of graph states to arbitrarily many distributed homogeneous quantum processing units (QPUs), providing a scalable partitioning algorithm and graph state generation protocol to minimize the number...
Unifying Graph Measures and Stabilizer Decompositions for the Classical Simulation of Quantum Circuits
Julien Codsi, Tuomas Laakkonen·Mar 6, 2026
Various algorithms have been developed to simulate quantum circuits on classical hardware. Among the most prominent are approaches based on \emph{stabilizer decompositions} and \emph{tensor network contraction}. In this work, we present a unified fra...
A Scheduler for the Active Volume Architecture
Sam Heavey, Athena Caesura·Mar 6, 2026
We improve the accuracy of Active Volume resource estimates by explicitly scheduling when Active Volume blocks execute. We present software that uses a greedy strategy to assign each logical qubit a role in each logical cycle (e.g., workspace, stale ...
Quantum Feedback Cooling without State Filtering
Lorenzo Franceschetti, Francesco Ticozzi·Mar 6, 2026
We introduce a state-based feedback law that stabilizes quantum states or subspaces associated with extremal values of a continuously monitored observable - a problem motivated by quantum cooling tasks. We then propose an output-based approximation t...
Universal Dynamical Scaling of Strong-to-Weak Spontaneous Symmetry Breaking in Open Quantum Systems
Chang Shu, Kai Zhang, Zhu-Xi Luo +2 more·Mar 6, 2026
Strong-to-weak spontaneous symmetry breaking (SWSSB) defines a mixed-state phase of matter--without a pure-state counterpart--in which nonlinear observables such as the Rényi-2 correlator develop long-range order while conventional linear correlation...
Quantum algorithm for the collision-coalescence of cloud droplets
Kazumasa Ueno, Hiroaki Miura·Mar 6, 2026
Quantum computing is gaining attention as a new approach for solving complex problems in many scientific fields. In atmospheric and oceanic sciences, it may help reduce computational costs of simulating large and nonlinear systems. However, research ...
Efficient Classical Simulation of Low-Rank-Width Quantum Circuits Using ZX-Calculus
Fedor Kuyanov, Aleks Kissinger·Mar 6, 2026
In this paper, we introduce a technique for contracting (i.e. numerically evaluating) ZX-diagrams whose complexity scales with their rank-width, a graph parameter that behaves nicely under ZX rewrite rules. Given a rank-decomposition of width $R$, ou...
Thermodynamics of Quantum Coupled Transport
Shuvadip Ghosh, Arnab Ghosh·Mar 6, 2026
This review presents a thermodynamic perspective on quantum coupled transport processes in nanoscale systems. Our analysis is formulated within the framework of entropy production rate, the central quantity governing non-equilibrium processes and exp...
Preparing 100-qubit symmetry-protected topological order on a digital quantum computer
George Pennington, Kevin C. Smith, James R. Garrison +3 more·Mar 6, 2026
Symmetry-protected topological (SPT) phases extend the Landau paradigm of quantum matter by admitting distinct symmetry-preserving phases that lack any local order parameter. Demonstrating these phases at scale on programmable quantum processors is a...
Leakage-protected idle operation of a triangular exchange-only spin qubit
Joseph D. Broz, Jesse C. Hoke, Edwin Acuna +1 more·Mar 6, 2026
We characterize the coherence of a triangular exchange-only (EO) spin qubit operated at a leakage-protected idle (LPI) point. The triangular geometry enables independent control of all three pairwise exchange interactions, and the LPI condition occur...
Learning to detect optical nonclassicality
Martina Jung, Suchitra Krishnaswamy, Timon Schapeler +4 more·Mar 6, 2026
Nonclassicality, defined in the quantum optical sense, serves as a resource for photon-based quantum technologies. Therefore, certifying the nonclassicality of a quantum state is crucial for gauging its potential for quantum advantage. However, tradi...