quantum-computing

Superradiant phase transition in cavity magnonics via Floquet engineering

arXiv Quantum Physics

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⚡ Quantum Brief

Researchers proposed a novel method to induce superradiant phase transitions in cavity magnonics using Floquet engineering, avoiding traditional microwave parametric drives. The team demonstrated precise control by periodically modulating magnon frequencies in a YIG sphere-cavity system. The system exhibits a rich phase diagram under Floquet drives, including parity-symmetric, broken-symmetry, bistable, and unstable states. Tunable effective frequencies enable dynamic phase manipulation via field strength and modulation parameters. A discontinuous first-order transition occurs at critical Floquet strength, marked by an abrupt jump in magnon occupation from zero to finite values. This breaks parity symmetry instantaneously. Further increasing Floquet strength triggers a continuous second-order transition, restoring parity symmetry as magnon occupation gradually returns to zero. The study maps this reversible phase behavior. Magnon number fluctuations during transitions were analyzed, offering insights into quantum noise effects in driven cavity-magnonic systems. This work expands SPT engineering toolkits beyond conventional approaches.

Superradiant phase transition in cavity magnonics via Floquet engineering

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Quantum Physics arXiv:2604.03646 (quant-ph) [Submitted on 4 Apr 2026] Title:Superradiant phase transition in cavity magnonics via Floquet engineering Authors:Si-Yan Lin, Fei Gao, Ye-Jun Xu, Lijiong Shen, Yan Wang, Xiao-Qing Luo, Guo-Qiang Zhang View a PDF of the paper titled Superradiant phase transition in cavity magnonics via Floquet engineering, by Si-Yan Lin and 6 other authors View PDF HTML (experimental) Abstract:We propose a scheme to engineer the superradiant phase transition (SPT) in cavity magnonics by periodically modulating the frequency of the magnon mode. The studied system is composed of a yttrium iron garnet (YIG) sphere positioned inside a microwave cavity, where magnons in the YIG sphere are strongly coupled to microwave photons. Under the Floquet drive, the effective frequencies of both the cavity and magnon modes can be readily controlled via the frequency and strength of Floquet field. This tunability allows the cavity magnonic system to support a rich steady-state phase diagram, featuring parity-symmetric, parity-symmetry-broken, bistable, and unstable phases. With the increase of Floquet-field strength, the system exhibit a discontinuous phase transition from the parity-symmetric phase to the parity-symmetry-broken phase at a critical threshold, accompanied by an abrupt jump of the magnon occupation from zero to a finite value. Upon further increase of Floquet-field strength, the magnon occupation declines continuously from a nonzero value back to zero, corresponding to a second-order phase transition that restores the parity-symmetric phase. Additionally, fluctuations in magnon number during the SPT process are examined. Our work establishes an alternative route to engineer the cavity-magnon SPT without relying on microwave parametric drive. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2604.03646 [quant-ph] (or arXiv:2604.03646v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2604.03646 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Guo-Qiang Zhang [view email] [v1] Sat, 4 Apr 2026 08:51:44 UTC (3,013 KB) Full-text links: Access Paper: View a PDF of the paper titled Superradiant phase transition in cavity magnonics via Floquet engineering, by Si-Yan Lin and 6 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph new | recent | 2026-04 References & Citations INSPIRE HEP NASA ADSGoogle Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... Data provided by: Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Code, Data and Media Associated with this Article alphaXiv Toggle alphaXiv (What is alphaXiv?) Links to Code Toggle CatalyzeX Code Finder for Papers (What is CatalyzeX?) DagsHub Toggle DagsHub (What is DagsHub?) GotitPub Toggle Gotit.pub (What is GotitPub?) Huggingface Toggle Hugging Face (What is Huggingface?) ScienceCast Toggle ScienceCast (What is ScienceCast?) Demos Demos Replicate Toggle Replicate (What is Replicate?) Spaces Toggle Hugging Face Spaces (What is Spaces?) Spaces Toggle TXYZ.AI (What is TXYZ.AI?) Related Papers Recommenders and Search Tools Link to Influence Flower Influence Flower (What are Influence Flowers?) Core recommender toggle CORE Recommender (What is CORE?) Author Venue Institution Topic About arXivLabs arXivLabs: experimental projects with community collaborators arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website. Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them. Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs. Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)

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Source: arXiv Quantum Physics

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