Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Casimir-Polder potential on an excited atom near an atomic array
Annyun Das, Kanu Sinha·Mar 6, 2026
We develop a microscopic description of the fluctuation-mediated Casimir-Polder (CP) shifts on a 'test' two-level atom placed near a two-dimensional atomic array of two-level atoms. We derive the resonant and off-resonant CP potentials experienced by...
Decoder Performance in Hybrid CV-Discrete Surface-Code Threshold Estimation Using LiDMaS+
Dennis Delali Kwesi Wayo, Chinonso Onah, Leonardo Goliatt +1 more·Mar 6, 2026
Threshold estimation is central to fault-tolerant quantum computing, but the reported threshold depends not only on the code and noise model, but also on the decoder used to interpret syndrome data. We study this dependence for surface-code threshold...
Optical pumping of alkali-metal vapor with hyperfine-resolved buffer gas pressure
Kezheng Yan, Jinbo Hu, Nan Zhao·Mar 6, 2026
Optical pumping is fundamental to high-precision measurement using thermal alkali-metal atoms in vapor cells. In applications such as spin-exchange-relaxation-free magnetometers, buffer gases (e.g., $\text{N}_2$ or $\text{He}$) are commonly employed ...
Heterogeneous entanglement between a trapped ion and a solid-state quantum memory
Chen-Xu Wang, Yi-Yang Wang, Tian-Xiang Zhu +11 more·Mar 6, 2026
Hybrid quantum networks offer a promising architecture for scalable quantum information processing and a future quantum internet, as they can combine the complementary strengths of disparate physical platforms. While single-atom systems provide deter...
Variational Quantum Algorithm for Constrained Combinatorial Optimization Problems
Hui-Min Li, Yuan-Liang Han, Zhi-Xi Wang +1 more·Mar 6, 2026
While variational quantum algorithms (VQAs) have demonstrated considerable success in unconstrained optimization, their application to constrained combinatorial problems face a trade-off. Penalty-based methods, despite their circuit simplicity, suffe...
Gaussian dynamics in the double Siegel disk
Giacomo Pantaleoni, Nicolas C. Menicucci·Mar 6, 2026
We show that deterministic multimode Gaussian channels admit a symmetric-space description. Passing from the n-mode Siegel disk to a doubled version of that space lets general Gaussian dynamics act by a linear-fractional (Mobius) transformation on a ...
Robust coherent control in non-Hermitian cavity electromagnonics using counterdiabatic driving
Guang-Hui Zhang, Yu-Wen Li, Xue-Ke Song +2 more·Mar 6, 2026
We propose to use counterdiabatic driving (CD) shortcut and the Floquet engineering to realize the robust and fast state transfer in the dissipation cavity magnon-polaritons non-Hermitian (NH) system. For the two-level NH cavity magnon-polaritons Ham...
Rovibrational energy levels of H$_2$O by quantum computing
Erik Lötstedt, Tamás Szidarovszky·Mar 6, 2026
We calculate rovibrational energy levels of H$_2$O using a trapped-ion quantum computer. We first derive the qubit form of Watson's Hamiltonian, including the rovibrational coupling terms. In a second step, we employ a variant of the quantum-selected...
An Optimization Framework for Monitor Placement in Quantum Network Tomography
Athira Kalavampara Raghunadhan, Matheus Guedes De Andrade, Don Towsley +3 more·Mar 6, 2026
Quantum Network Tomography (QNT) offers a framework for end-to-end quantum channel characterization by strategically placing monitor nodes within the network. Building upon prior work on single-monitor placement, we study optimal monitor placement an...
Variational Quantum Eigensolver for the Analysis of High-Resolution NMR Spectra: Applications to AB and AB2 Spin Systems
Murat Kurt, Ayda Kaltehei, Selçuk Çakmak +1 more·Mar 5, 2026
The Variational Quantum Algorithms (VQAs) are hybrid quantum-classical algorithms and they can be used in the Nosiy Intermadiate Scale Quantum (NISQ) devises. The Variational Quantum Eigensolver (VQE) was suggested as a first VQA. VQE is based on the...
State-Selective Signatures of Quantum and Classical Gravitational Environments
Partha Nandi, Sankarshan Sahu, Bibhas Ranjan Majhi +1 more·Mar 5, 2026
A unified framework is developed for determining whether a gravitational-wave (GW) background behaves as a classical field or as a genuinely quantum environment. Unified here means that both descriptions originate from the same tidal coupling derived...
A Non-Foster Superconducting Broadband Matching Network
Andrew K. Yi, Pamela Stark, Chelsea Bartram·Mar 5, 2026
The nonlinear inductance of the Josephson junction has enabled the development of a wide range of continuous-variable amplifiers and qubit-based devices with unprecedented sensitivity. We present an alternative use of the Josephson junction in the co...
Nonlocal Generalized Dirac Oscillators in (1 + 1) Dimensions
Abdelmalek Boumali·Mar 5, 2026
We propose a nonlocal extension of the generalized Dirac oscillator (GDO) in $(1+1)$ dimensions by replacing the multiplicative interaction $f(x)$ with an integral operator $\hat F$ with kernel $f(x,x')$. The resulting Dirac equation preserves an ope...
The toric code under antiferromagnetic isotropic Heisenberg interactions
Won Jang, Robert Peters, Thore Posske·Mar 5, 2026
We investigate the impact of an isotropic antiferromagnetic Heisenberg perturbation on the toric code, focusing on the resulting quantum phase transition and the nature of the phase that emerges beyond topological order. Using neural-network quantum ...
Steady-State Multiparticle Entanglement via Dissipative Engineering in Waveguide QED
Joan Alba, Jacob Thornfeldt Hansen, Jean-Baptiste S. Béguin +1 more·Mar 5, 2026
We propose a simple scheme for the dissipative generation of entangled states of multiple emitters coupled to a waveguide. Our approach exploits collective interactions arising from the formation of subradiant and superradiant excited states, combine...
Order Unit Spaces and Probabilistic Models
John Harding, Alex Wilce·Mar 5, 2026
We exhibit a functor from the category OUS of order unit spaces and positive, unit-preserving mappings into the category $\Prob$ of probabilistic models (test spaces with designated state spaces) and morphisms thereof. Restricted to any subcategory o...
Scalable Digital Compute-in-Memory Ising Machines for Robustness Verification of Binary Neural Networks
Madhav Vadlamani, Rahul Singh, Yuyao Kong +2 more·Mar 5, 2026
Verification of binary neural network (BNN) robustness is NP-hard, as it can be formulated as a combinatorial search for an adversarial perturbation that induces misclassification. Exact verification methods therefore scale poorly with problem dimens...
Matchgate circuit representation of fermionic Gaussian states: optimal preparation, approximation, and classical simulation
Marc Langer, Raúl Morral-Yepes, Adam Gammon-Smith +2 more·Mar 5, 2026
Fermionic Gaussian states (FGSs) and the associated matchgate circuits play a central role in quantum information theory and condensed matter physics. Despite being possibly highly entangled, they can still be efficiently simulated on classical compu...
Classical Simulability from Operator Entanglement Scaling
Neil Dowling·Mar 5, 2026
Local-operator entanglement (LOE) quantifies the nonlocal structure of Heisenberg operators and serves as a diagnostic of many-body chaos. We provide rigorous bounds showing when an operator can be well-approximated by a matrix-product operator (MPO)...
Ramsey correlation spectroscopy with phase cycling using a single quantum sensor
Inbar Zohar, Santiago Oviedo-Casado, Andrej Denisenko +2 more·Mar 5, 2026
Magnetic spectroscopy at the nanoscale provides unique insights into material properties and dynamics, with quantum sensors like nitrogen-vacancy (NV) centers being ideally suited for these scales. However, detecting low-frequency signals remains a c...