Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Flux-tunable transmon incorporating a van der Waals superconductor via an Al/AlO$_x$/4Hb-TaS$_2$ Josephson junction
Eliya Blumenthal, Ilay Mangel, Amit Kanigel +1 more·Jan 27, 2026
Incorporating van der Waals (vdW) superconductors into Josephson elements extends circuit-QED beyond conventional Al/AlO$_x$/Al tunnel junctions and enables microwave probes of unconventional condensates and subgap excitations. In this work, we reali...
Analytical solution of the Schrödinger equation with $1/r^3$ and attractive $1/r^2$ potentials: Universal three-body parameter of mixed-dimensional Efimov states
Yuki Ohishi, Kazuki Oi, Shimpei Endo·Jan 27, 2026
We study the Schrödinger equation with $1/r^3$ and attractive $1/r^2$ potentials. Using the quantum defect theory, we obtain analytical solutions for both repulsive and attractive $1/r^3$ interactions. The obtained discrete-scale-invariant energies a...
Quantum Zeno-like Paradox for Position Measurements: A Particle Precisely Found in Space is Nowhere to be Found in Hilbert Space
Xabier Oianguren-Asua, Roderich Tumulka·Jan 27, 2026
On a quantum particle in the unit interval $[0,1]$, perform a position measurement with inaccuracy $1/n$ and then a quantum measurement of the projection $|φ\rangle\langleφ|$ with some arbitrary but fixed normalized $φ$. Call the outcomes $X \in[0,1]...
Mikado strategy for the detection of atoms in images of microtrap arrays
Marc Cheneau, François Goudail·Jan 27, 2026
Building on top of our recent work [arXiv:2502.08511], we introduce a new strategy to solve the problem of detecting atoms in high-resolution images of microtrap arrays. By alternating estimation and detection steps, we get rid of the need for an exp...
Nanomechanical sensor resolving impulsive forces below its zero-point fluctuations
Martynas Skrabulis, Martin Colombano Sosa, Nicola Carlon Zambon +4 more·Jan 27, 2026
The sensitivity of a mechanical transducer is ultimately limited by its inherent quantum fluctuations. Here, we use an optically levitated nanoparticle to measure impulsive forces smaller than the particle's zero-point momentum uncertainty. Our appro...
Remote magnon-phonon entanglement in the waveguide-magnomechanics
Shi-fan Qi, Fan Li·Jan 27, 2026
Generating long-distance quantum entanglement is crucial for advancing quantum information processing. In this work, we propose a protocol for generating remote magnon-phonon entanglement in a hybrid waveguide-magnomechanical system, where multiple s...
Experimental High-Accuracy and Broadband Quantum Frequency Sensing via Geodesic Control
Si-Qi Chen, Qi-Tao Duan, Teng Li +1 more·Jan 27, 2026
Accurate frequency estimation of oscillating signals over a broad bandwidth is a central task in quantum sensing, yet it is often compromised by spurious responses to higher-order harmonics in realistic multi-frequency environments. Here we experimen...
Continuous-mode analysis of improved two-way CV-QKD
Yanhao Sun, Jiayu Ma, Xiangyu Wang +3 more·Jan 27, 2026
Continuous-variable quantum key distribution (CV-QKD) enables information-theoretically secure key generation between legitimate parties. To further enhance system performance, an improved two-way CV-QKD protocol has been proposed, which is accessibl...
Beyond Photon Shot Noise: Chemical Limits in Spectrophotometric Precision
Georg Engelhardt, Dahai He, JunYan Luo·Jan 27, 2026
In this work, we investigate precision limitations in spectrophotometry (i.e., spectroscopic concentration measurements) imposed by chemical processes of molecules. Using the recently developed Photon-resolved Floquet theory, which generalizes Maxwel...
Graphene Josephson Junctions for Engineering Motional Quanta
Zhen-Yang Peng, Mehdi Abdi·Jan 27, 2026
We propose a hybrid quantum device based on the graphene Josephson junctions, where the vibrational degrees of freedom of a graphene membrane couple to the superconducting circuits. The flexural mode-controlled tunneling of the Cooper pairs introduce...
Broadband Heterodyne Microwave Detection using Rydberg Atoms with High Sensitivity
Hsuan-Jui Su, Shao-Cheng Fang, Ting-An Li +3 more·Jan 27, 2026
We present a Rydberg atom-based microwave electric field sensor that achieves extended dynamic range and enhanced sensitivity across a broad bandwidth. By characterizing the Autler-Townes (AT) splitting induced by a single-tone microwave field, we de...
Reinforcement Learning for Enhanced Advanced QEC Architecture Decoding
Yidong Zhou, Lingyi Kong, Yifeng Peng +1 more·Jan 27, 2026
The advent of promising quantum error correction (QEC) codes with efficient resource utilization and high-performance fault-tolerant quantum memories signifies a critical step towards realizing practical quantum computation. While surface codes have ...
Pareto-Front Engineering of Dynamical Sweet Spots in Superconducting Qubits
Zhen Yang, Shan Jin, Yajie Hao +4 more·Jan 27, 2026
Operating superconducting qubits at dynamical sweet spots (DSSs) suppresses decoherence from low-frequency flux noise. A key open question is how long coherence can be extended under this strategy and what fundamental limits constrain it. Here we int...
Universal Operational Privacy in Distributed Quantum Sensing
Min Namkung, Dong-Hyun Kim, Seongjin Hong +3 more·Jan 27, 2026
Privacy is a fundamental requirement in distributed quantum sensing networks, where multiple clients estimate spatially distributed parameters using shared quantum resources while interacting with potentially untrusted servers. Despite its importance...
Analytical construction of $(n, n-1)$ quantum random access codes saturating the conjectured bound
Takayuki Suzuki·Jan 27, 2026
Quantum Random Access Codes (QRACs) embody the fundamental trade-off between the compressibility of information into limited quantum resources and the accessibility of that information, serving as a cornerstone of quantum communication and computatio...
Quantum computing of the nonlinear Schrödinger equation via measurement-induced potential reconstruction
Kaiwen Weng, Zhaoyuan Meng, Guohui Hu·Jan 27, 2026
The nonlinear Schrödinger equation (NLSE) is a fundamental model that describes diverse complex phenomena in nature. However, simulating the NLSE on a quantum computer is inherently challenging due to the presence of the nonlinear term. We propose a ...
The strong converse exponent of composable randomness extraction against quantum side information
Roberto Rubboli, Marco Tomamichel·Jan 27, 2026
We find a tight characterization of the strong converse exponent for randomness extraction against quantum side information. In contrast to previous tight bounds, we employ a composable error criterion given by the fidelity (or purified distance) to ...
High-Performance Exact Synthesis of Two-Qubit Quantum Circuits
Andrew N. Glaudell, Michael Jarret, Swan Klein +3 more·Jan 27, 2026
Exact synthesis provides unconditional optimality and canonical structure, but is often limited to small, carefully scoped regimes. We present an exact synthesis framework for two-qubit circuits over the Clifford+$T$ gate set that optimizes $T$-count...
The complexity of semidefinite programs for testing $k$-block-positivity
Qian Chen, Benoît Collins·Jan 27, 2026
We extend \cite{chen2025srkbp} by analyzing the complexity of the $k$-block-positivity testing algorithm that stems from the optimization problem in Definition \ref{definition:SDP-k-block-positivity}. In this paper, we investigate a symmetry reductio...
Evolution of quantum geometric tensor of 1D periodic systems after a quench
Jia-Chen Tang, Xu-Yang Hou, Yu-Huan Huang +1 more·Jan 27, 2026
We investigate the post-quench dynamics of the quantum geometric tensor (QGT) of 1D periodic systems with a suddenly changed Hamiltonian. The diagonal component with respect to the crystal momentum gives a metric corresponding to the variance of the ...