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Live trends in quantum computing research, updated daily from arXiv.
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Assessing Finite Scalability in Early Fault-Tolerant Quantum Computing for Homogeneous Catalysts
Yanbing Zhou, Athena Caesura, Corneliu Buda +3 more·Nov 13, 2025
As quantum hardware advances toward fault-tolerant operation, an intermediate stage known as early fault-tolerant quantum computing (EFTQC) is emerging, where partial error correction enables meaningful computation. In this regime, the ability of qua...
Optomechanical Cooling without Residual Heating
Surangana Sengupta, Björn Kubala, Joachim Ankerhold +1 more·Nov 13, 2025
Resolved-sideband cooling is a standard technique in cavity optomechanics enabling quantum control of mechanical motion, but its performance is ultimately limited by quantum backaction heating. This fundamental effect imposes a limit on the minimum a...
Work distribution and fluctuation theorem in AdS/CFT
Daichi Takeda·Nov 13, 2025
From the AdS/CFT dictionary, we derive a bulk dual of the work distribution defined by the two-point measurement on the boundary, yielding a bulk formulation of the Tasaki-Crooks fluctuation theorem. We argue that this not only provides a holographic...
Modification of Hanle and polarization recovery curves under interplay of hopping and quantum measurement back action
A. L. Zibinskiy, D. S. Smirnov·Nov 13, 2025
The measurements of Hanle and polarization recovery effects for localized charge carriers are the basic tools for determining parameters of the spin dynamics, such as strength of the hyperfine interaction, for example, in quantum dots. We describe th...
Generalized coherent states with shifted (displaced) arguments
Dušan Popov·Nov 13, 2025
In the paper we developed a procedure for constructing generalized coherent states with shifted argument, as a result of the action of the generalized displacement operator. This was based on the action of a pair of nonlinear ladder operators, which ...
Low-Energy Free-Electron Nonclassical Lasing
Mai Zhang, Yu Wang, Chang-Ling Zou +4 more·Nov 13, 2025
Harnessing a beam of slow free electrons in artificial photonic structures offers a powerful, tunable platform for generating nonclassical light without the need for heavy physical equipment. Here we present a theory of nonclassical lasing, demonstra...
Quantum Simulation of Non-unitary Dynamics via Contour-based Matrix Decomposition
Chao Wang, Huan-Yu Liu, Cheng Xue +4 more·Nov 13, 2025
We introduce contour-based matrix decomposition (CBMD), a framework for scalable simulation of non-unitary dynamics. Unlike existing methods that follow the ``integrate-then-discretize" paradigm and rely heavily on numerical quadrature, CBMD generali...
Photon transport and blockade based on non-Markovian interactions between a microring resonator and waveguide
Haijin Ding·Nov 13, 2025
We investigate photon transport and blockade based on the architecture where a waveguide is coupled to a microring resonator at two distinct points. This two-point coupling configuration between the waveguide and resonator gives rise to non-Markovian...
Lévy-Khintchine Structure Enables Fast-Forwardable Lindbladian Simulation
Minbo Gao, Zhengfeng Ji, Chenghua Liu·Nov 13, 2025
Simulation of open quantum systems is an area of active research in quantum algorithms. In this work, we revisit the connection between Markovian open-system dynamics and averages of Hamiltonian real-time evolutions, which we refer to as Hamiltonian ...
Direct Raman observation of the quantum metric in a quantum magnet
Chao-Fan Wang, Han Ge, Jun-Yang Chen +4 more·Nov 13, 2025
The quantum geometric tensor (QGT) unifies the Berry curvature (its imaginary part) and the quantum metric (its real part), yet Raman studies of chiral phonons have so far accessed only the former. We perform circularly polarized Raman spectroscopy o...
Tunable single-photon frequency converter in a waveguide with a giant V-type atom
Hongzheng Wu, Ge Sun, Jing Lu +1 more·Nov 13, 2025
We study the single-photon scattering in a one-dimensional (1D) waveguide coupled to one transition of a $V$-type giant atom (GA), whose other transition is coherently driven by an classical field. The inelastic scattering of single photons by the GA...
Proof-of-principle demonstration of a Polarization-Circulation Speed Meter
Yohei Nishino, Tomotada Akutsu, Yoichi Aso +3 more·Nov 13, 2025
We present the first experimental implementation of a polarization-circulation speed meter. In our experiment, the interferometer was reduced to a single-cavity configuration with all mirrors fixed. A green-locking scheme was employed to stabilize th...
High-Energy Decays and Weak Quantum Measurements
Alan J. Barr·Nov 13, 2025
High-energy particle decays naturally realise informationally weak measurements of quantum spin. Decay kinematics act as continuous pointer variables whose overlapping angular distributions encode partial, non-projective information about the parent ...
Addressable fault-tolerant universal quantum gate operations for high-rate lift-connected surface codes
Josias Old, Juval Bechar, Markus Müller +1 more·Nov 13, 2025
Quantum low-density parity check (qLDPC) codes are among the leading candidates to realize error-corrected quantum memories with low qubit overhead. Potentially high encoding rates and large distance relative to their block size make them appealing f...
Continuum limit of gauged tensor network states
Gertian Roose, Erez Zohar·Nov 13, 2025
It is well known that all physically relevant states of gauge theories lie in the sectors of the Hilbert space which satisfy the Gauss law. On the lattice, the manifeslty gauge invariant subspace is known to be exactly spanned by gauged tensor networ...
Improved Offline Reinforcement Learning via Quantum Metric Encoding
Outongyi Lv, Yewei Yuan, Nana Liu·Nov 13, 2025
Reinforcement learning (RL) with limited samples is common in real-world applications. However, offline RL performance under this constraint is often suboptimal. We consider an alternative approach to dealing with limited samples by introducing the Q...
QuCoWE Quantum Contrastive Word Embeddings with Variational Circuits for NearTerm Quantum Devices
Rabimba Karanjai, Hemanth Hegadehalli Madhavarao, Lei Xu +1 more·Nov 13, 2025
We present QuCoWE a framework that learns quantumnative word embeddings by training shallow hardwareefficient parameterized quantum circuits PQCs with a contrastive skipgram objective Words are encoded by datareuploading circuits with controlled ring...
Measurement protocol for detecting correlated topological insulators in synthetic quantum systems
Yixin Ma, Chao Xu, Shenghan Jiang·Nov 13, 2025
Two-dimensional topological insulators, characterized by symmetry-protected anomalous boundary modes, have been generalized to the strongly correlated regime for both bosonic and fermionic systems. As correlated topological insulators (TI) approach e...
Competing Localizations on Disordered Non-Hermitian Random Graph Lattice
S Rahul, A Harshitha·Nov 13, 2025
Phase transitions in one-dimensional lattice systems are well established and have been extensively studied within both Hermitian and non-Hermitian frameworks. In this work, we extend this understanding to a more general setting by investigating loca...
General quantum backflow in realistic wave packets
Tomasz Paterek, Arseni Goussev·Nov 13, 2025
Quantum backflow is a counterintuitive phenomenon in which the probability density of a quantum particle propagates opposite to its momentum. Experimental observation of backflow has remained elusive due to two main challenges: (i) the effect is intr...