Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Quantum Riemannian Hamiltonian Descent
Yoshihiko Abe, Ryo Nagai·Mar 30, 2026
We propose Quantum Riemannian Hamiltonian Descent (QRHD), a quantum algorithm for continuous optimization on Riemannian manifolds that extends Quantum Hamiltonian Descent (QHD) by incorporating geometric structure of the parameter space via a positio...
First-Click Time Measurements
Mafalda Pinto Couto, Lorenzo Maccone, Lorenzo Catani +1 more·Mar 30, 2026
There are two distinct perspectives on the quantum time-of-arrival: one can ask for the probability that a particle is found at the detector at a given time, regardless of whether it was previously detected, or for the probability that the particle i...
Lindbladian Simulation with Commutator Bounds
Xinzhao Wang, Shuo Zhou, Xiaoyang Wang +3 more·Mar 30, 2026
Trotter decomposition provides a simple approach to simulating open quantum systems by decomposing the Lindbladian into a sum of individual terms. While it is established that Trotter errors in Hamiltonian simulation depend on nested commutators of t...
Average Equilibration Time for Gaussian Unitary Ensemble Hamiltonians
Emanuel Schwarzhans, Alessandro Candeloro, Felix C. Binder +2 more·Mar 30, 2026
Understanding equilibration times in closed quantum systems is essential for characterising their approach to equilibrium. Chaotic many-body systems are paradigmatic in this context: they are expected to thermalise according to the eigenstate thermal...
Discriminating idempotent quantum channels
Satvik Singh, Bjarne Bergh·Mar 30, 2026
We study binary discrimination of idempotent quantum channels. When the two channels share a common full-rank invariant state, we show that a simple image inclusion condition completely determines the asymptotic behavior: when it holds, a broad famil...
From Hole Theory to Quantum Field Theory: Relativistic Fermions and the Role of Ettore Majorana (1933-1937)
Francesco Vissani·Mar 30, 2026
Between 1933 and 1937, the treatment of relativistic spin-1/2 particles, initially rooted in Hole theory, evolved into the modern framework of quantum field theory. This paper reconstructs the crucial stages of that transition by examining the formal...
The Power of Power-of-SWAP: Postselected Quantum Computation with the Exchange Interaction
Jędrzej Burkat, Sergii Strelchuk, Michał Studziński·Mar 30, 2026
We introduce Exchange Quantum Polynomial Time (XQP) circuits, which comprise quantum computation using only computational basis SPAM and the isotropic Heisenberg exchange interaction. Structurally, this sub-universal model captures decoherence-free s...
Tunable Nonlocal ZZ Interaction for Remote Controlled-Z Gates Between Distributed Fixed-Frequency Qubits
Benzheng Yuan, Chaojie Zhang, Haoran He +9 more·Mar 30, 2026
Fault-tolerant quantum computing requires large-scale superconducting processors, yet monolithic architectures face increasing constraints from wiring density, crosstalk, and fabrication yield. Modular superconducting platforms offer a scalable alter...
Quantized Dissipation from the Inverse-Square Anomaly in a Non-Hermitian Klein-Gordon Field
Mansour Haghighat, Ali Nouri·Mar 30, 2026
We construct an exactly solvable relativistic model that embeds the anomalous inverse-square interaction into a non-Hermitian Klein-Gordon field theory through a purely imaginary, scale-invariant scalar potential. The stationary field equation reduce...
SesQ: A Surface Electrostatic Simulator for Precise Energy Participation Ratio Simulation in Superconducting Qubits
Ziang Wang, Shuyuan Guan, Feng Wu +6 more·Mar 30, 2026
An accurate and efficient numerical electromagnetic model for superconducting qubits is essential for characterizing and minimizing design-dependent dielectric losses. The energy participation ratio (EPR) is the commonly adopted metric used to evalua...
Photon-triplets for quantum optics generated by a phase-matched third-order difference-frequency mixing in a KTiOPO4 bulk crystal pumped at 532 nm
Gaspar Mougin-Trichon, Veronique Boutou, Corinne Felix +2 more·Mar 30, 2026
We report implementation and modelling of an efficient photon-triplets generation experiment based on a difference-frequency-mixing of two picosecond beams at 532 nm and 1491 nm in a type II phase-matched KTP crystal. The photon-triplets flux was mea...
Probing excited-state quantum phase transitions with trapped cold ions
Marek Kuchař, Michal Macek·Mar 30, 2026
We propose concrete protocols to realize quantum criticality due to excited-state quantum phase transitions (ESQPTs) experimentally in presumably the simplest and most resilient system involving a single trapped ion oscillating in a radio-frequency P...
Open-System Adiabatic Quantum Search under Dephasing
Afaf El Kalai, Peter J. Eder, Christian B. Mendl·Mar 30, 2026
Adiabatic quantum algorithms must evolve slowly enough to suppress non-adiabatic transitions while remaining fast enough to be practical. In open systems, this trade-off is reshaped by decoherence. For Hamiltonians subject to dephasing Lindbladians, ...
Emergent-Coupling-Based Ansatz Evaluated on a Superconducting Quantum Processor
Alina Joch, Kevin Lively, Benedikt Fauseweh·Mar 30, 2026
The performance of the variational quantum eigensolver depends critically on the choice of ansatz. In this work, we experimentally evaluate the emergent-coupling-based ansatz (ECBA), a physically motivated variational ansatz for disordered systems. T...
$1/N^2$ Precision Interferometry with Collectively Enhanced Atomic Mirror
Yuan Liu, Ke-Mi Xu, Hong-Bo Sun +1 more·Mar 30, 2026
Quantum metrology exploits quantum resources to enhance measurement precision beyond the classical limit. Conventional protocols normally rely on the preparation of delicate quantum states to acquire these resources, posing a major challenge for scal...
Mixed-register Stabilizer Codes: A Coding-theoretic Perspective
Himanshu Dongre, Lane G. Gunderman·Mar 30, 2026
Protecting information in systems that have more than two basis states (qudits) not only offers a promising route for reducing the number of individual quantum locations that must be protected, while more accurately reflecting the structure of realis...
Phase statistics of a single qubit emission as a direct probe of its coherence
A. Sultanov, E. Mutsenik, L. Kaczmarek +4 more·Mar 30, 2026
The emission of photon from an individual atom encodes the phase of its initialized quantum state. Using single-shot heterodyne detection, we measure the phase distribution of the emission from a superconducting transmon qubit in an open waveguide co...
Learning unified control of internal spin squeezing in atomic qudits for magnetometry
C. Z. Cao, J. Z. Han, M. Xiong +4 more·Mar 30, 2026
Generating and preserving metrologically useful quantum states is a central challenge in quantum-enhanced atomic magnetometry. In multilevel atoms operated in the low-field regime, the nonlinear Zeeman (NLZ) effect is both a resource and a limitation...
Resource-efficient quantum approximate optimization algorithm via Bayesian optimization and maximum-probability evaluation
Siran Zhang, Shuming Cheng·Mar 30, 2026
The quantum approximate optimization algorithm (QAOA) is a leading variational approach to combinatorial optimization, but its practical performance depends strongly on objective design, parameter search, and shot allocation. We present a resource-ef...
The force of attraction between nucleons due to vacuum fluctuation
Anupam Ghosh·Mar 30, 2026
In this letter, we derive the interaction energy and the force between two parallel metal plates, arising from quantum vacuum fluctuations when they are very close to each other. We consider the vacuum to be composed of a meson field. In Quantum Hadr...