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Spins were polarized beyond Boltzmann equilibrium using spin selective optical excitation of the no-phonon bound exciton transition resulting in $N$ = $3.6\\cdot10^{13}$ unpaired spins in the ensemble. We observed a normal mode splitting of the spin ensemble-cavity polariton resonances of 2$g\\sqrt{N}$ = 580 kHz (where each spin is coupled with strength $g$) in a cavity with a quality factor of 75,000 ($\\gamma \\ll \\kappa \\approx$ 60 kHz where $"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1702.00504","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-02-01T23:56:23Z","cross_cats_sorted":["cond-mat.mes-hall"],"title_canon_sha256":"6d8cbe6a8b9e4eafc0e8330ccd1d771b350ec92f116ba88a431b980f43ca222e","abstract_canon_sha256":"b459d90645f2dca940f29f86c99e297796d74aec611a2556e9b99e9c1cc1f0aa"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:40:07.330933Z","signature_b64":"g4t3MP7Ow/1XqK6c7s1FdbOFY38TAVgv2O22HdoeFt5PT4pNdtxBEgjyPCz3NuwKgzrexowQ42oCbKOAjcUnCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f97005f962a2e9247cee4a4e3e38ac564e49c86430541de7e006012bf5015d4b","last_reissued_at":"2026-05-18T00:40:07.330466Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:40:07.330466Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Coherent Rabi dynamics of a superradiant spin ensemble in a microwave cavity","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mes-hall"],"primary_cat":"quant-ph","authors_text":"A. 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