Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Stacking the odds: full-stack quantum system design space exploration
Hila Safi, Medina Bandic, Christoph Niedermeier +3 more·Jun 3, 2025
Design space exploration (DSE) plays an important role in optimising quantum circuit execution by systematically evaluating different configurations of compilation strategies and hardware settings. In this paper, we conduct a comprehensive investigat...
Exceeding the Parametric Drive Strength Threshold in Nonlinear Circuits
Mingkang Xia, Crist'obal Lled'o, Matthew Capocci +7 more·Jun 3, 2025
Superconducting quantum circuits rely on strong drives to implement fast gates, high-fidelity readout, and state stabilization. However, these drives can induce uncontrolled excitations, so-called"ionization", that compromise the fidelity of these op...
Coherent error induced phase transition
Hanchen Liu, Xiao Chen·May 31, 2025
We investigate the stability of logical information in quantum stabilizer codes subject to coherent unitary errors. Beginning with a logical state, we apply a random unitary error channel and subsequently measure stabilizer checks, resulting in a syn...
Probing the quantum motion of a macroscopic mechanical oscillator with a radio-frequency superconducting qubit
Kyrylo Gerashchenko, Rémi Rousseau, Léo Balembois +11 more·May 27, 2025
Long-lived mechanical resonators like drums oscillating at MHz frequencies and operating in the quantum regime are a powerful platform for quantum technologies and tests of fundamental physics. Yet, quantum control of such systems remains challenging...
Evidence of Memory Effects in the Dynamics of Two-Level System Defect Ensembles Using Broadband, Cryogenic Transient Dielectric Spectroscopy
Qianxu Wang, Sara Magdalena G'omez, J. Salcedo-Gallo +6 more·May 23, 2025
Two-level system (TLS) defects in dielectrics cause decoherence in superconducting circuits, yet their origin, frequency distribution, and dipole moments remain poorly understood. Current probes, primarily based on qubits or resonators, require compl...
Circuit structure-preserving error mitigation for High-Fidelity Quantum Simulations
Ruizhe Shen, Tianqi Chen, Ching Hua Lee·May 22, 2025
Developing methods to accurately characterize and mitigate the impact of noise is crucial for enhancing the fidelity of quantum simulations on Noisy Intermediate-Scale Quantum (NISQ) devices. In this work, we present a circuit structure-preserving er...
Problem specific ion native ansatz for combinatorial optimization
Georgii Paradezhenko, Daniil Rabinovich, Ernesto Campos +1 more·May 21, 2025
Variational quantum algorithms have become a standard approach for solving a wide range of problems on near-term quantum computers. Identifying an appropriate ansatz configuration for variational algorithms, however, remains a challenging task, espec...
An engineering guide to superconducting quantum circuit shielding
E. Malevannaya, V. Polozov, A. Ivanov +10 more·May 20, 2025
In this review, we provide a practical guide to superconducting quantum circuits protection from broadband electromagnetic and infrared radiation using cryogenic shielding and microwave line filtering. Recently, superconducting multi-qubit processors...
Variational quantum simulation of a nonadditive relaxation dynamics in a qubit coupled to a finite-temperature bath
Lucas Q. Galvão, Clebson Cruz, Antonio Cesar do Prado Rosa Junior +1 more·May 17, 2025
In this paper, we present an application of the variational quantum simulation (VQS) framework to capture finite-temperature open-system dynamics on near-term quantum hardware. By embedding the generalized amplitude-damping channel into the VQS algor...
Collective light shifts of many longitudinal cavity modes induced by coupling to a cold-atom ensemble
Marin Ðujić, Mateo Kruljac, Lovre Kardum +4 more·May 15, 2025
We experimentally study the interaction between a cold atom cloud and many longitudinal modes of a high quality Fabry-Perot cavity, by measuring signatures of collective light shifts in the cavity transmission spectrum of an optical frequency comb pr...
Protected Symmetrical Superconducting Qubit Based on Quantum Flux Parametron
Kian Rafati Sajedi, Mojtaba Hosseinpour Choubi, M. Fardmanesh·May 10, 2025
Conventional Quantum Flux Parametrons (QFPs) have historically been used for storing classical bits in Josephson junction-based computers. In this work, we propose a novel QFP-based topology dubbed"Degenerium"qubit, to process and compute quantum inf...
Structure theorem for quantum replacer codes
Eric Chitambar, Sarah Hagen, D. Kribs +2 more·May 10, 2025
Quantum replacer codes are codes that can be protected from errors induced by a given set of quantum replacer channels, an important class of quantum channels that includes the erasures of subsets of qubits that arise in quantum error correction. We ...
Scalable Quantum State Preparation via Large-Language-Model-Driven Discovery
Qing-Hong Cao, Zongbin Hou, Ying-Ying Li +5 more·May 9, 2025
Efficient quantum state preparation remains a central challenge in first-principles quantum simulations of dynamics in quantum field theories, where the Hilbert space is intrinsically infinite-dimensional. Here, we introduce a large language model (L...
Optical vortex generation by magnons with spin-orbit-coupled light
Ryusuke Hisatomi, Alto Osada, Kotaro Taga +5 more·May 6, 2025
Light possesses both spin and orbital angular momentum, which can spontaneously couple in spatially asymmetric optical fields. This phenomenon is referred to as optical spin-orbit coupling. This coupling is pivotal in modern optics due to its broad a...
Engineering CSS surgery: compiling any CNOT in any code
Cl'ement Poirson, Joschka Roffe, R. Booth·May 2, 2025
We introduce a framework for implementing logic in CSS quantum error correction codes, building on the surgery methods of Cowtan and Burton [CB24]. Our approach offers a systematic methodology for designing and analysing surgery protocols. At the phy...
Theory of quasiparticle generation by microwave drives in superconducting qubits
Shoumik Chowdhury, Max Hays, Shantanu R. Jha +4 more·May 1, 2025
Microwave drives play a central role in the control of superconducting quantum circuits, enabling qubit gates, readout, and parametric interactions. As the drive frequencies are typically an order of magnitude smaller than (twice) the superconducting...
Offset Charge Dependence of Measurement-Induced Transitions in Transmons
Mathieu Féchant, Marie Frédérique Dumas, Denis Bénâtre +9 more·May 1, 2025
A key challenge in achieving scalable fault tolerance in superconducting quantum processors is readout fidelity, which lags behind one- and two-qubit gate fidelity. A major limitation in improving qubit readout is measurement-induced transitions, als...
Probing excited-state dynamics of transmon ionization
Zihao Wang, Benjamin D'Anjou, Philippe Gigon +2 more·May 1, 2025
The fidelity and quantum nondemolition character of the dispersive readout in circuit QED are limited by unwanted transitions to highly excited states at specific photon numbers in the readout resonator. This observation can be explained by multiphot...
Experimental evidence for the physical delocalization of individual photons in an interferometer
Ryuya Fukuda, Masataka Iinuma, Yuto Matsumoto +1 more·May 1, 2025
It is generally assumed that the detection of a single photon as part of an interference pattern erases all possible which-path information. However, recent insights suggest that weak interactions can provide non-trivial experimental evidence for the...
Microwave-activated high-fidelity three-qubit gate scheme for fixed-frequency superconducting qubits
Kui Zhao, Wei Ma, Ziting Wang +5 more·Apr 30, 2025
Scalable superconducting quantum processors require balancing critical constraints in coherence, control complexity, and spectral crowding. Fixed-frequency architectures suppress flux noise and simplify control via all-microwave operations but remain...