Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Noninvasive and nonadiabatic quantum Maxwell demon
Lucas Trigal, Rafael Sánchez·Aug 5, 2025
A quantum mechanical Maxwell demon is proposed in a quantum dot setting. The demon avoids continuous-measurement induced decoherence by exploiting an undetailed charge detector. The control of coherent tunneling via Landau-Zener-Stückelberg-Majorana ...
Maximally non-projective measurements are not always symmetric informationally complete
Gabriele Cobucci, Raphael Brinster, Shishir Khandelwal +4 more·Aug 5, 2025
Standard quantum measurements are projective. However, the full scope of quantum measurements is represented by positive operator-valued measures (POVMs) and many of these break the limitations of projective measurements as resources in quantum infor...
Entanglement Detection Beyond Local Bound with Coarse Calibrated measurements
Liang-Liang Sun, Yong-Shun Song, Sixia Yu·Aug 5, 2025
Bell's test, initially devised to distinguish quantum theory from local hidden variable models through {violations of local bounds}, is also a common tool for detecting entanglement. For this purpose, one can assume the quantum description of devices...
Macroscopic entanglement between localized domain walls inside a cavity
Rahul Gupta, H. Y. Yuan, Himadri Shekhar Dhar·Aug 5, 2025
We present a scheme for generating stable and tunable entanglement between two localized Bloch domain walls in nanomagnetic strips kept inside a chiral optical cavity. The entanglement is mediated by the effective optomechanical interaction between t...
Characterizing and Mitigating Flux Crosstalk in Superconducting Qubits-Couplers System
Myrron Albert Callera Aguila, Nien-Yu Li, Chen-Hsun Ma +12 more·Aug 5, 2025
Superconducting qubits have achieved exceptional gate fidelities, exceeding the error-correction threshold in recent years. One key ingredient of such improvement is the introduction of tunable couplers to control the qubit-to-qubit coupling through ...
Squeezed Quasinormal Modes from Nonlinear Gravitational Effects
Sreenath K. Manikandan, Frank Wilczek·Aug 5, 2025
We estimate the degree of squeezing possible in gravitational waves due to nonlinear gravitational effects in the weakly perturbative regime. Using the predicted amplitude ratios for higher harmonic generation in the ringdown phase of a black hole me...
CutVQA: Co-Designing Circuit Cutting and Architecture Search for Scaling Variational Quantum Algorithms
Jun Wu, Jicun Li, Jiaqi Yang +2 more·Aug 5, 2025
Circuit cutting enables large quantum circuits to run on small NISQ devices, but it introduces an exponentially high sampling overhead. Here, we present CutVQA, a co-design framework that integrates circuit cutting with quantum architecture search to...
Fermionic-Adapted Shadow Tomography for dynamical correlation functions
Taehee Ko, Mancheon Han, Hyowon Park +1 more·Aug 5, 2025
Dynamical correlation functions are essential for characterizing the response of the quantum many-body systems to the external perturbation. As their calculation is classically intractible in general, quantum algorithms are promising in this aspect, ...
Existing experiments suffice to indirectly verify the quantum essence of gravity
Martin Plávala·Aug 5, 2025
The gravity-mediated entanglement experiments employ concepts from quantum information to argue that if entanglement due to gravitational interaction is observed, then gravity cannot be described by a classical system. However, the proposed experimen...
Moveless: Minimizing QEC Qverhead on QCCDS via Versatile Execution and Low Excess Shuttling
Sahil Khan, Suhas Vittal, Kenneth R. Brown +1 more·Aug 5, 2025
One of the most promising paths towards large scale fault tolerant quantum computation is the use of quantum error correcting codes. The majority of popular codes are stabilizer codes, in which error information is extracted via the repeated executio...
Do GNN-based QEC Decoders Require Classical Knowledge? Evaluating the Efficacy of Knowledge Distillation from MWPM
Ryota Ikeda·Aug 5, 2025
The performance of decoders in Quantum Error Correction (QEC) is key to realizing practical quantum computers. In recent years, Graph Neural Networks (GNNs) have emerged as a promising approach, but their training methodologies are not yet well-estab...
Causal Interventions Beyond Time: A CP-do(C)-Calculus for Indefinite Quantum Order
Jordi Vallverdú·Aug 5, 2025
We reformulate Pearl's three rules of do-calculus in the language of completely positive (CP) trace-preserving maps, thereby extending them to quantum systems with entanglement. We prove that Rule~2 fails whenever the underlying process admits indefi...
Estimated scale of Born rule violation in superconducting qubit measurement
Jonathan F. Schonfeld·Aug 5, 2025
I estimate the size of expected Born rule violation for a two-level superconducting qubit with dispersive readout. The estimate is based on extrapolating from an earlier analysis of experimental data on cloud chamber detection. That analysis made no ...
Charge sensitivity in the transmon regime
Rocio Gonzalez-Meza, V. Iaia, Anika Zaman +4 more·Aug 5, 2025
Transmons are widely adopted in quantum computing architectures for their engineered insensitivity to charge noise and correspondingly long relaxation times. Despite this advantage, transmons often exhibit large fluctuations in dephasing times across...
Fault-tolerant Fusion-based Quantum Computing with the Four-legged Cat Code
H. K. Babla, James D. Teoh, J. Claes +4 more·Aug 5, 2025
The four-legged cat code is a quantum error-correcting code designed to address the predominant error in bosonic modes: single-photon loss. It was the first such code to surpass the break-even point, thereby demonstrating the practical utility of qua...
Probing and Enhancing the Robustness of GNN-based QEC Decoders with Reinforcement Learning
Ryota Ikeda·Aug 5, 2025
Graph Neural Networks (GNNs) have emerged as a powerful, data-driven approach for Quantum Error Correction (QEC) decoding, capable of learning complex noise characteristics directly from syndrome data. However, the robustness of these decoders agains...
Characterizing noisy quantum computation with imperfectly addressed errors
Riddhi S. Gupta, Salini Karuvade, Kerstin Beer +2 more·Aug 5, 2025
Quantum protocols on hardware are subject to noise that prohibits performance. Protocols for addressing errors, such as error correction or error mitigation, may fail to combat errors in quantum computation if noise violates critical assumptions requ...
A resource-efficient quantum-walker Quantum RAM
Giuseppe De Riso, Giuseppe Catalano, Seth Lloyd +2 more·Aug 4, 2025
Efficient and coherent data retrieval and storage are essential for harnessing quantum algorithms' speedup. Such a fundamental task is addressed by a quantum Random Access Memory (qRAM). Despite their promising scaling properties, current qRAM propos...
Strong electron-electron interactions in a dilute weakly-localized metal near a metal-to-insulator transition
Nicolò D'Anna, Jamie Bragg, Aidan G. McConnell +12 more·Aug 4, 2025
Because it is easily switched from insulator to metal either via chemical doping or electrical gating, silicon is at the core of modern information technology and remains a candidate platform for quantum computing. The metal-to-insulator transition i...
Measurement-Induced Entanglement in Conformal Field Theory
Kabir Khanna, Romain Vasseur·Aug 4, 2025
Local measurements can radically reshape patterns of many-body entanglement, especially in long-range entangled quantum-critical states. Yet, analytical results addressing the effects of measurements on many-body states remain scarce, and measurement...