{"paper":{"title":"3D integration of a hybrid quantum dot circuit-QED device for fast gate dispersive charge readout and coherent spin-photon coupling","license":"http://creativecommons.org/licenses/by/4.0/","headline":"3D integration with indium bumps and NbN films produces hybrid quantum dot devices that reach 75 MHz spin-photon coupling and high cavity quality factors.","cross_cats":[],"primary_cat":"cond-mat.mes-hall","authors_text":"Alain Gueugnot, Benoit Bertrand, Chafik Mhamdi, Etienne Dumur, Frederic Berger, Frederic Gustavo, Heimanu Niebojewski, Jean-Luc Thomassin, Romain Maurand, Sebastien Granel, Simon Zihlmann","submitted_at":"2026-04-28T17:08:34Z","abstract_excerpt":"Hybrid circuit quantum electrodynamics (cQED) aims at coupling various quantum degrees of freedom, among which are spin and charge degrees of freedom in gate defined quantum dots, phonons or magnons... with quantized electromagnetic fields in superconducting microwave cavities to investigate fundamental physics questions or for quantum computation and simulation. However, low microwave losses, key for many hybrid cQED experiments, are challenging to achieve given the often exotic and/or complex material stacks (e.g. semiconducting material, ferromagnets, or piezoelectric materials) required to"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"we report a cavity internal quality factor above 10000 and demonstrate record sensitivity for gate-based dispersive readout of the charge degree of freedom with an SNR of 100 in 300 ns. Finally, we demonstrate strong spin-photon coupling of gs/{2π} = 75 MHz, which highlights the viability of 3D-integration for quantum dot based hybrid spin circuit quantum electrodynamics","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"That the indium bump interconnects and 3D stacking process introduce negligible additional microwave losses, charge noise, or decoherence to the MOS quantum dots, preserving the reported high cavity Q and coupling strength.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"A 3D-integrated silicon MOS double quantum dot device with high-impedance NbN resonator achieves cavity Q above 10,000, dispersive charge readout SNR of 100 in 300 ns, and spin-photon coupling gs/2π = 75 MHz.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"3D integration with indium bumps and NbN films produces hybrid quantum dot devices that reach 75 MHz spin-photon coupling and high cavity quality factors.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"63b37811f833a17978bf9e384864a83f4b62f1f609d59c9a34d65e14b70d73c6"},"source":{"id":"2604.25871","kind":"arxiv","version":2},"verdict":{"id":"c5c83b78-df8a-46d1-b88c-b3b7ab4d2b53","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-07T15:11:16.309025Z","strongest_claim":"we report a cavity internal quality factor above 10000 and demonstrate record sensitivity for gate-based dispersive readout of the charge degree of freedom with an SNR of 100 in 300 ns. Finally, we demonstrate strong spin-photon coupling of gs/{2π} = 75 MHz, which highlights the viability of 3D-integration for quantum dot based hybrid spin circuit quantum electrodynamics","one_line_summary":"A 3D-integrated silicon MOS double quantum dot device with high-impedance NbN resonator achieves cavity Q above 10,000, dispersive charge readout SNR of 100 in 300 ns, and spin-photon coupling gs/2π = 75 MHz.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"That the indium bump interconnects and 3D stacking process introduce negligible additional microwave losses, charge noise, or decoherence to the MOS quantum dots, preserving the reported high cavity Q and coupling strength.","pith_extraction_headline":"3D integration with indium bumps and NbN films produces hybrid quantum dot devices that reach 75 MHz spin-photon coupling and high cavity quality factors."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2604.25871/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"ai_meta_artifact","ran_at":"2026-05-21T03:39:22.212085Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"doi_compliance","ran_at":"2026-05-19T20:42:16.905137Z","status":"completed","version":"1.0.0","findings_count":0}],"snapshot_sha256":"c1f5c024a37df2b166ae68ca8e37ead16dac1c111179dc74474b96628ff940b2"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}