Flux-Activated Resonant Control of a Bosonic Quantum Memory

Flux-Activated Resonant Control of a Bosonic Quantum Memory | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Flux-Activated Resonant Control of a Bosonic Quantum Memory Yvonne Gao, Fernando Valadares, Aleksandr Dorogov, Tanjung Krisnanda, and 3 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-9097048/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted You are reading this latest preprint version Abstract Universal control of bosonic degrees of freedom provides a hardware-efficient route for quantum information processing with high-dimensional systems. Bosonic circuit quantum electrodynamics (cQED), which leverages auxillary transmons to coherently control long-lived superconducting cav- ities, is well suited to this goal. However, such systems are traditionally operated in the dispersive regime, where the nearly degenerate cavity transitions prohibit the direct addressability of indi- vidual excitation levels of the bosonic mode and increase gate complexity. Here, we achieve direct oscillator control by dynamically accessing the resonant Jaynes–Cummings (JC) interactions, im- plemented with a hardware that integrates on-chip broadband magnetic flux delivery with a bosonic memory housed in a 3D superconducting cavity with lifetime exceeding 0.5ms. We demonstrate deterministic preparation of Fock states and their superpositions within 100s of nanoseconds by directly climbing the JC ladder, and realise efficient arbitrary rotations between any pair of Fock states. Our resonant control scheme provides an analytical method for manipulating the entire Hilbert space of the bosonic mode at rates fundamentally more favourable than traditional disper- sive strategies. This on-demand access to JC interactions opens a promising path toward realising robust Fock-basis qudits and harnessing the rich dynamics of high-dimensional bosonic systems for quantum information processing. Physical sciences/Physics/Quantum physics/Quantum information Physical sciences/Physics/Quantum physics/Qubits Physical sciences/Physics/Quantum physics/Quantum mechanics Full Text Additional Declarations There is NO Competing Interest. Supplementary Files FARSupplementary.pdf Supplementary Materials: Flux-Activated Resonant Control of a Bosonic Quantum Memory Cite Share Download PDF Status: Under Review Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-9097048","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":623080706,"identity":"743bc2b9-6b37-4f7d-9aa5-099f62b5ee2a","order_by":0,"name":"Yvonne 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Bosonic circuit quantum electrodynamics\r\n(cQED), which leverages auxillary transmons to coherently control long-lived superconducting cav-\r\nities, is well suited to this goal. However, such systems are traditionally operated in the dispersive\r\nregime, where the nearly degenerate cavity transitions prohibit the direct addressability of indi-\r\nvidual excitation levels of the bosonic mode and increase gate complexity. Here, we achieve direct\r\noscillator control by dynamically accessing the resonant Jaynes–Cummings (JC) interactions, im-\r\nplemented with a hardware that integrates on-chip broadband magnetic flux delivery with a bosonic\r\nmemory housed in a 3D superconducting cavity with lifetime exceeding 0.5ms. We demonstrate\r\ndeterministic preparation of Fock states and their superpositions within 100s of nanoseconds by\r\ndirectly climbing the JC ladder, and realise efficient arbitrary rotations between any pair of Fock\r\nstates. Our resonant control scheme provides an analytical method for manipulating the entire\r\nHilbert space of the bosonic mode at rates fundamentally more favourable than traditional disper-\r\nsive strategies. This on-demand access to JC interactions opens a promising path toward realising\r\nrobust Fock-basis qudits and harnessing the rich dynamics of high-dimensional bosonic systems for\r\nquantum information processing.","manuscriptTitle":"Flux-Activated Resonant Control of a Bosonic Quantum Memory","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2026-04-15 10:25:06","doi":"10.21203/rs.3.rs-9097048/v1","editorialEvents":[],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"nature-physics","isNatureJournal":true,"hasQc":false,"allowDirectSubmit":false,"externalIdentity":"nphys","sideBox":"Learn more about [Nature Physics](http://www.nature.com/nphys/)","snPcode":"","submissionUrl":"","title":"Nature Physics","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"ejp","reportingPortfolio":"Nature Research","inReviewEnabled":true,"inReviewRevisionsEnabled":false}}],"origin":"","ownerIdentity":"fad7ebc2-de45-4b2c-893b-dba82400e66c","owner":[],"postedDate":"April 15th, 2026","published":true,"recentEditorialEvents":[{"type":"editorInvitedReview","content":"This content is not available.","date":"2026-05-12T18:23:10+00:00","index":3,"fulltext":"This content is not available."},{"type":"editorInvitedReview","content":"This content is not available.","date":"2026-05-12T17:49:03+00:00","index":2,"fulltext":"This content is not available."},{"type":"editorInvitedReview","content":"This content is not available.","date":"2026-05-07T02:26:18+00:00","index":1,"fulltext":"This content is not available."}],"rejectedJournal":[],"revision":"","amendment":"","status":"under-review","subjectAreas":[{"id":66308709,"name":"Physical sciences/Physics/Quantum physics/Quantum information"},{"id":66308710,"name":"Physical sciences/Physics/Quantum physics/Qubits"},{"id":66308711,"name":"Physical sciences/Physics/Quantum physics/Quantum mechanics"}],"tags":[],"updatedAt":"2026-04-15T10:25:06+00:00","versionOfRecord":[],"versionCreatedAt":"2026-04-15 10:25:06","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-9097048","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-9097048","identity":"rs-9097048","version":["v1"]},"buildId":"XKTyCvWXoU3ODBz1xrDgd","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}