{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:HYCVWJSO6BCQR5FSK4YKA3BBPY","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"169f2b81592afc23cb941a748f3aa1a7fc97ab1ec331e697614add9ea46d21d2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-07-19T18:46:10Z","title_canon_sha256":"93e0731d3e76fc7096b3ec46062c55d556c726041cbd2d0722d3001a28e2ac87"},"schema_version":"1.0","source":{"id":"0907.3313","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0907.3313","created_at":"2026-05-18T02:12:55Z"},{"alias_kind":"arxiv_version","alias_value":"0907.3313v1","created_at":"2026-05-18T02:12:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0907.3313","created_at":"2026-05-18T02:12:55Z"},{"alias_kind":"pith_short_12","alias_value":"HYCVWJSO6BCQ","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"HYCVWJSO6BCQR5FS","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"HYCVWJSO","created_at":"2026-05-18T12:25:59Z"}],"graph_snapshots":[{"event_id":"sha256:9075b765836f96876a0ba53f21dd248367dfe1358480e6174988f5cd23bc43c3","target":"graph","created_at":"2026-05-18T02:12:55Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We have cooled the motion of a radio-frequency nanomechanical resonator by parametric coupling to a driven microwave frequency superconducting resonator. Starting from a thermal occupation of 480 quanta, we have observed occupation factors as low as 3.8$\\pm$1.2 and expect the mechanical resonator to be found with probability 0.21 in the quantum ground state of motion. Cooling is limited by random excitation of the microwave resonator and heating of the dissipative mechanical bath.","authors_text":"A.A. Clerk, C. Macklin, J.B. Hertzberg, K.C. Schwab, T. Ndukum, T. Rocheleau","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-07-19T18:46:10Z","title":"Preparation and Detection of a Mechanical Resonator Near the Ground State of Motion"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0907.3313","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:7075689287dfa2182954a3f8bcc12288eb6ec503833c9a907748e7eb45d77d3d","target":"record","created_at":"2026-05-18T02:12:55Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"169f2b81592afc23cb941a748f3aa1a7fc97ab1ec331e697614add9ea46d21d2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-07-19T18:46:10Z","title_canon_sha256":"93e0731d3e76fc7096b3ec46062c55d556c726041cbd2d0722d3001a28e2ac87"},"schema_version":"1.0","source":{"id":"0907.3313","kind":"arxiv","version":1}},"canonical_sha256":"3e055b264ef04508f4b25730a06c217e0e5db7d9e0657f297ee88bcf697b1f48","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3e055b264ef04508f4b25730a06c217e0e5db7d9e0657f297ee88bcf697b1f48","first_computed_at":"2026-05-18T02:12:55.733111Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:12:55.733111Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"BoMxwkJ/fyD7BjDZGs+Gv0nPUO9sY8Ek7ZQKXhKmi3IIrz2g+IpKfB9uHaK+yNEIkggC+lfQ+m6ObuNeb+s4BA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:12:55.733605Z","signed_message":"canonical_sha256_bytes"},"source_id":"0907.3313","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7075689287dfa2182954a3f8bcc12288eb6ec503833c9a907748e7eb45d77d3d","sha256:9075b765836f96876a0ba53f21dd248367dfe1358480e6174988f5cd23bc43c3"],"state_sha256":"eca29a726a5194071cd170e36f98afc2239f1b792ce6d430a0a80bdfbf12ed9d"}