Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Two-photon-excited fluorescence spectroscopy of Rb atoms in a magneto-optical trap
Alan McLean, Christian Drago, Daniel Podos +5 more·Feb 6, 2026
We report the results of two-photon-excited fluorescence (TPEF) measurements of the $5\mathrm{S}_{1/2} \rightarrow 5\mathrm{D}_{1/2}$ transition of $^{85}$Rb and $^{87}$Rb cooled in a magneto-optical trap (MOT). We observe TPEF at excitation powers a...
Putting fermions onto a digital quantum computer
Riley W. Chien, Mitchell L. Chiew, Brent Harrison +8 more·Feb 6, 2026
Quantum computers are expected to become a powerful tool for studying physical quantum systems. Consequently, a number of quantum algorithms for studying the physical properties of such systems have been developed. While qubit-based quantum computers...
Magnetic Field-Mediated Superconducting Logic
Alexander J. Edwards, Son T. Le, Nicholas W. G. Smith +7 more·Feb 6, 2026
While superconductors are highly attractive for energy-efficient computing, fundamental limitations in their logic circuit integration have hindered scaling and led to increased energy consumption. We therefore propose and experimentally demonstrate ...
Performance limits of a quantum receiver for detecting phase-modulated communication signals
William M. Watkins, Leigh Norris, Paraj Titum·Feb 6, 2026
Quantum sensors are an ideal candidate for detecting weak electromagnetic signals because of their exceptional sensitivity and compact form factor. In this work, we analyze the performance of a quantum-sensor-based receive chain for demodulating info...
Zero-point energy of solids from vacuum fluctuation and quantum geometric force
Yugo Onishi, Liang Fu·Feb 6, 2026
We show that quantum fluctuations of electromagnetic fields induce an additional zero-point energy in solids, which scales with the volume. For insulators, the zero-point energy density is proportional to quantum fluctuation of electric polarization ...
Entanglement harvesting in conformal field theory
Kelly Wurtz, Caroline Lima, Robert C. Myers +1 more·Feb 6, 2026
We study entanglement harvesting in general $d$-dimensional conformal field theories using pointlike Unruh-DeWitt detectors coupled to scalar primary operators. This extends standard harvesting protocols beyond free fields to interacting conformal th...
Beyond Wigner: Non-Invertible Symmetries Preserve Probabilities
Thomas Bartsch, Yuhan Gai, Sakura Schafer-Nameki·Feb 6, 2026
In recent years, the traditional notion of symmetry in quantum theory was expanded to so-called generalised or categorical symmetries, which, unlike ordinary group symmetries, may be non-invertible. This appears to be at odds with Wigner's theorem, w...
Charge-$4e$ superconductor with parafermionic vortices: A path to universal topological quantum computation
Zhengyan Darius Shi, Zhaoyu Han, Srinivas Raghu +1 more·Feb 6, 2026
Topological superconductors (TSCs) provide a promising route to fault-tolerant quantum information processing. However, the canonical Majorana platform based on $2e$ TSCs remains computationally constrained. In this work, we find a $4e$ TSC that over...
Empirical Evaluation of QAOA with Zero Noise Extrapolation on NISQ Hardware for Carbon Credit Portfolio Optimization in the Brazilian Cerrado
Hugo José Ribeiro·Feb 6, 2026
Optimizing carbon credit portfolios is a critical challenge for climate mitigation, particularly in high-biodiversity biomes such as the Brazilian Cerrado. This study explores the practical application of the Quantum Approximate Optimization Algorith...
Symmetry and localisation in causally constrained quantum operator dynamics
Marcell D. Kovács, Christopher J. Turner, Lluís Masanes·Feb 6, 2026
This paper explores the connection between causality and many-body dynamics by studying the algebraic structure of tri-partite unitaries ('walls') which permanently arrest local operator spreading in their time-periodic evolution. We show that the re...
The Quantum Sieve Tracer: A Hybrid Framework for Layer-Wise Activation Tracing in Large Language Models
Jonathan Pan·Feb 6, 2026
Mechanistic interpretability aims to reverse-engineer the internal computations of Large Language Models (LLMs), yet separating sparse semantic signals from high-dimensional polysemantic noise remains a significant challenge. This paper introduces th...
Consensus Protocols for Entanglement-Aware Scheduling in Distributed Quantum Neural Networks
Kuan-Cheng Chen, Samuel Yen-Chi Chen, Mahdi Chehimi +2 more·Feb 6, 2026
The realization of distributed quantum neural networks (DQNNs) over quantum internet infrastructures faces fundamental challenges arising from the fragile nature of entanglement and the demanding synchronization requirements of distributed learning. ...
Comment on "Relativistic covariance and nonlinear quantum mechanics: Tomonaga-Schwinger analysis''
Lajos Diósi·Feb 6, 2026
Contrary to the central claim (Hsu, 2026) published in Physics Letters B, the Tomonaga--Schwinger equation remains covariant despite the nonlinear modification of it. The proof of covariance becomes simple after the loopholes and mistakes in Hsu's ar...
Hybrid Coupling Topology with Dynamic ZZ Suppression for Optimizing Circuit Depth during Runtime in Superconducting Quantum Processor
Uday Sannigrahi, Amlan Chakrabarti, Swapnil Saha +1 more·Feb 6, 2026
To reduce circuit depth when executing Quantum algorithms, it is necessary to maximize qubit connectivity on a near-term quantum processor. While addressing this, we also need to ensure high gate fidelity, suppression of unwanted ZZ cross-talk, a com...
Phase-sensitive characterization of a quantum frequency converter by spectral interferometry
Mateusz J Olszewski, Kasper Hecht Alexander, Michael T M Woodley +3 more·Feb 6, 2026
We introduce an experimental technique for complete phase-sensitive characterization of arbitrary unitary spectral-temporal transformations of optical modes. Our method recovers the complex spectral transfer function, or Green's function, of a freque...
Heralding efficiency and brightness optimization of a micro-ring resonator via tunable coupling
Nathan Moses, Marcus J. Clark, Alex S. Clark +2 more·Feb 6, 2026
Efficient and bright single photon sources on photonic chips are key to scaling quantum technologies. Spontaneous four wave mixing in micro-ring resonators creates excellent narrowband and tunable photon sources. We experimentally demonstrate the opt...
FaA-CAF: Modular Single-RF-Chain Near-Field mmWave Sensing via Clip-On Antenna Fabric
Pin-Han Ho, Haoran Mei, Limei Peng +5 more·Feb 6, 2026
Near field mmWave sensing is poised to play a key role in future wireless systems, enabling environment-aware, embodied, and application adaptive operation under stringent form-factor and hardware constraints. However, achieving high spatial resoluti...
Quasiperiodic nondipole ionization dynamics in the x-ray stabilization regime
Aleksandr V. Boitsov, Karen Z. Hatsagortsyan, Christoph H. Keitel·Feb 6, 2026
Recent advances in strong x-ray laser techniques enable the study of nonlinear multiphoton ionization in extreme high-frequency fields. Although the stabilization regime in such fields is theoretically established, its modified properties in the nond...
Alleviating Post-Linearization Challenges for Solving Nonlinear Systems on a Quantum Computer
Tayyab Ali·Feb 6, 2026
The linearity inherent in quantum mechanics limits current quantum hardware from directly solving nonlinear systems governed by nonlinear differential equations. One can opt for linearization frameworks such as Carleman linearization, which provides ...
Bridging Quantum and Semi-Classical Thermodynamics in Cavity QED
Marcelo Janovitch, Sander Stammbach, Matteo Brunelli +1 more·Feb 6, 2026
In cavity quantum electrodynamics (QED), photons leaving the cavity can be irreversibly lost or reused as a power source. This dichotomy is reflected in two different thermodynamic bookkeepings of the light field, both corresponding to valid thermody...