Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Distinguishing Coherent and Incoherent Errors in Multi-Round Time-Reversed Dynamics via Scramblons
Zeyu Liu, Pengfei Zhang·Jan 8, 2026
Despite the rapid development of quantum science and technology, errors are inevitable and play a crucial role in quantum simulation and quantum computation. In quantum chaotic systems, coherent errors arising from imperfect Hamiltonian control and i...
Multimode Fock-State Measurements using Dispersive Shifts in a Trapped Ion
Wonhyeong Choi, Jiyong Kang, Kyunghye Kim +3 more·Jan 8, 2026
Trapped ions naturally host multiple motional modes alongside long-lived spin qubits, providing a scalable multimode bosonic register. Efficiently characterizing such bosonic registers requires the ability to access many motional modes with limited s...
Below-shot-noise capacity in phase estimation using nonlinear interferometers
Cristofero Oglialoro, Gerard J. Machado, Felix Farsch +7 more·Jan 7, 2026
Over the past decade, several schemes for imaging and sensing based on nonlinear interferometers have been proposed and demonstrated experimentally. These interferometers exhibit two main advantages. First, they enable probing a sample at a chosen wa...
Cavity-Driven Multispectral Gain for High-Sensitivity NV Center Magnetometers
Himanshu Kumar, Rahul Gupta, Saikat Ghosh +2 more·Jan 7, 2026
We report a cavity-enabled solid-state magnetometer based on an NV ensemble coupled with a dielectric cavity, achieving 12 pT/$\sqrt{\rm{Hz}}$ sensitivity and a nearly threefold gain from multispectral features. The features originate from cavity-ind...
Interference-Induced Suppression of Doublon Transport and Prethermalization in the Extended Bose-Hubbard Model
Zhen-Ting Bao, Kai Xu, Heng Fan·Jan 7, 2026
The coherent mobility of doublons, arising from second-order virtual dissociation-recombination processes, fundamentally limits their use as information carriers in the strongly interacting Bose-Hubbard model. We propose a disorder-free suppression m...
Optical Spectroscopy of Waveguide coupled Er$^{3+}$ ensembles in CaWO$_4$ and YVO$_4$
Fabian Becker, Anna Selzer, Lorenz J. J. Sauerzopf +4 more·Jan 6, 2026
We present an optical study of near-surface Er$^{3+}$ ensembles in waveguide-integrated CaWO$_4$ and YVO$_4$, investigating how nanophotonic coupling modifies rare-earth spectroscopy. In particular, we compare bulk excitation with evanescently couple...
Operational modes of a Raman-coupled two-qubit quantum thermal machine
Alonso Alcalá, Charlie Oncebay, Onofre Rojas +1 more·Jan 6, 2026
We investigate a quantum thermal machine composed of two qubits coupled through a Raman-induced exchange interaction and driven by inhomogeneous transition frequencies. The system is analyzed within Carnot, Otto, and Stirling thermodynamic cycles, in...
Entanglement Entropy for Screened Interactions via Dimensional Mapping to Harmonic Oscillators
Akshay Kulkarni, Rahul Nigam·Jan 6, 2026
We investigate interaction-induced corrections to entanglement entropy by mapping a screened Yukawa-type interaction to an effective harmonic oscillator system with controlled anharmonic perturbations. Starting from a one-dimensional interaction $V(x...
Stable boundary modes for fragile topology from spontaneous PT-symmetry breaking
Kang Yang, Fei Song, Piet W. Brouwer·Jan 6, 2026
Two-dimensional topological insulators protected by nonlocal symmetries or with fragile topology usually do not admit robust in-gap edge modes due to the incompatibility between the symmetry and the boundary. Here, we show that in a parity-time (PT) ...
Topological Obstructions for Quantum Adiabatic Algorithms: Evidence from MaxCut Instances
Prathamesh S. Joshi·Jan 5, 2026
Quantum adiabatic algorithms are commonly analyzed through local spectral properties of an interpolating Hamiltonian, most notably the minimum energy gap. While this perspective captures an important constraint on adiabatic runtimes, it does not full...
Magnetically Induced Transparency-Absorption and Normal-Anomalous Dispersion Characteristics of ${}^{87}\text{Rb}$ Medium or Any J-Type Configuration Atomic Vapors Subject to a Vector Magnetic Field and a Weak Resonant Pump
Hayk L. Gevorgyan·Jan 5, 2026
We have developed an analytical framework for magnetically induced transparency-absorption (MITA) and normal-anomalous dispersion (MINAD) in a weakly driven ${}^{87}\text{Rb}$ vapor, or any J-type three-level system, under a vector magnetic field. By...
Parallel Quantum Gates via Scalable Subsystem-Optimized Robust Control
Xiaodong Yang, Ran Liu, Jun Li·Jan 5, 2026
Accurate and efficient implementation of parallel quantum gates is crucial for scalable quantum information processing. However, the unavoidable crosstalk between qubits in current noisy processors impedes the achievement of high gate fidelities and ...
Random-Matrix-Induced Simplicity Bias in Over-parameterized Variational Quantum Circuits
Jun Qi, Chao-Han Huck Yang, Pin-Yu Chen +1 more·Jan 5, 2026
Over-parameterization is commonly used to increase the expressivity of variational quantum circuits (VQCs), yet deeper and more highly parameterized circuits often exhibit poor trainability and limited generalization. In this work, we provide a theor...
Quantum Interaction Between Free Electrons and Light Involving First-order and Second-order Process
Hongteng Lin, Xiaotong Xiong, Junjie Liu +2 more·Jan 5, 2026
Photon-induced Near-field Electron Microscopy (PINEM) effect has revealed the quantum interaction between free electrons and optical near filed, which demonstrated plenty of novel phenomena of manipulating free electron wave packet and detecting/shap...
Quantum information of optical magnetometry: Semiclassical Cramer-Rao bound violation and Heisenberg scaling
Georg Engelhardt, Ming Li, Xingchang Wang +2 more·Jan 5, 2026
Optical magnetometers use the rotation of linearly polarized laser light induced by the Faraday effect for high precision magnetic field measurements. Here, we carry out an in-depth quantum information investigation, deploying two distinct models: Th...
Benchmarking Quantum Data Center Architectures: A Performance and Scalability Perspective
Shahrooz Pouryousef, Eneet Kaur, Hassan Shapourian +3 more·Jan 4, 2026
Scalable distributed quantum computing (DQC) has motivated the design of multiple quantum data-center (QDC) architectures that overcome the limitations of single quantum processors through modular interconnection. While these architectures adopt fund...
Thermodynamic analysis of autonomous quantum systems
Tiago F. F. Santos, Camille Latune·Jan 3, 2026
Traditional quantum thermodynamic frameworks associate work to energy exchanges induced by unitary transformations generated by external controls, and heat to energy exchanges induced by bath interaction. Recently, a framework was introduced aiming a...
Pseudo-Hermitian Magnon Dynamics
Jamal Berakdar, Xi-guang Wang·Jan 2, 2026
A defining quantity of a physical system is its energy which is represented by the Hamiltonian. In closed quantum mechanical or/and coherent wave-based systems the Hamiltonian is introduced as a Hermitian operator which ensures real energy spectrum a...
Experimental exclusion of a generalized Károlyházy gravity-induced decoherence model
Nicola Bortolotti, Kristian Piscicchia, Matthias Laubenstein +4 more·Jan 2, 2026
We report new experimental constraints on the generalized version of the gravity-induced decoherence model originally proposed by Károlyházy. Using data collected by the VIP Collaboration at the INFN Gran Sasso National Laboratory with a high-purity ...
Photonic Reservoir Engineering via 2D $Λ$-Type Atomic Arrays in Waveguide QED
Thi Phuong Anh Nguyen, Le Phuong Hoang, Xuan Binh Cao·Jan 2, 2026
Electromagnetically induced transparency (EIT) in $Λ$-type atomic systems underpins quantum technologies such as high-fidelity memory and nonlinear optics, but conventional setups face intrinsic limitations. Standard geometries of one-dimensional ato...