{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2005:XXJ73TDPIYVPN5CY4YY2QHBGTS","short_pith_number":"pith:XXJ73TDP","schema_version":"1.0","canonical_sha256":"bdd3fdcc6f462af6f458e631a81c269cbbe0496efcc8d77603a415abcd26d042","source":{"kind":"arxiv","id":"quant-ph/0508007","version":3},"attestation_state":"computed","paper":{"title":"Rapid State-Reduction of Quantum Systems Using Feedback Control","license":"","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Joshua Combes, Kurt Jacobs","submitted_at":"2005-08-01T13:44:07Z","abstract_excerpt":"We consider using Hamiltonian feedback control to increase the speed at which a continuous measurement purifies (reduces) the state of a quantum system, and thus to increase the speed of the preparation of pure states. For a measurement of an observable with N equispaced eigenvalues, we show that there exists a feedback algorithm which will speed up the rate of state-reduction by at least a factor of 2(N+1)/3."},"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":"quant-ph/0508007","kind":"arxiv","version":3},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"2005-08-01T13:44:07Z","cross_cats_sorted":[],"title_canon_sha256":"9b347b2ec565e262cc1fef04818f2e845b13b8cab941c0e250b1672d442254e8","abstract_canon_sha256":"3b5cef3237338b17590e1a93f91d95c4db12b899b5811e0e5af6256869994f54"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:47:55.483189Z","signature_b64":"ykzxgy8umnIYYZY6EF1/JdCLZtlfl7eFsZnB6bNVItY63MXLwQJfHAWEAVol595Q4DYWrJLsKcZ6YbSemCcNDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bdd3fdcc6f462af6f458e631a81c269cbbe0496efcc8d77603a415abcd26d042","last_reissued_at":"2026-07-04T15:47:55.482788Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:47:55.482788Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Rapid State-Reduction of Quantum Systems Using Feedback Control","license":"","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Joshua Combes, Kurt Jacobs","submitted_at":"2005-08-01T13:44:07Z","abstract_excerpt":"We consider using Hamiltonian feedback control to increase the speed at which a continuous measurement purifies (reduces) the state of a quantum system, and thus to increase the speed of the preparation of pure states. For a measurement of an observable with N equispaced eigenvalues, we show that there exists a feedback algorithm which will speed up the rate of state-reduction by at least a factor of 2(N+1)/3."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/0508007","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/quant-ph/0508007/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/0508007","created_at":"2026-07-04T15:47:55.482853+00:00"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/0508007v3","created_at":"2026-07-04T15:47:55.482853+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/0508007","created_at":"2026-07-04T15:47:55.482853+00:00"},{"alias_kind":"pith_short_12","alias_value":"XXJ73TDPIYVP","created_at":"2026-07-04T15:47:55.482853+00:00"},{"alias_kind":"pith_short_16","alias_value":"XXJ73TDPIYVPN5CY","created_at":"2026-07-04T15:47:55.482853+00:00"},{"alias_kind":"pith_short_8","alias_value":"XXJ73TDP","created_at":"2026-07-04T15:47:55.482853+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/XXJ73TDPIYVPN5CY4YY2QHBGTS","json":"https://pith.science/pith/XXJ73TDPIYVPN5CY4YY2QHBGTS.json","graph_json":"https://pith.science/api/pith-number/XXJ73TDPIYVPN5CY4YY2QHBGTS/graph.json","events_json":"https://pith.science/api/pith-number/XXJ73TDPIYVPN5CY4YY2QHBGTS/events.json","paper":"https://pith.science/paper/XXJ73TDP"},"agent_actions":{"view_html":"https://pith.science/pith/XXJ73TDPIYVPN5CY4YY2QHBGTS","download_json":"https://pith.science/pith/XXJ73TDPIYVPN5CY4YY2QHBGTS.json","view_paper":"https://pith.science/paper/XXJ73TDP","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=quant-ph/0508007&json=true","fetch_graph":"https://pith.science/api/pith-number/XXJ73TDPIYVPN5CY4YY2QHBGTS/graph.json","fetch_events":"https://pith.science/api/pith-number/XXJ73TDPIYVPN5CY4YY2QHBGTS/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/XXJ73TDPIYVPN5CY4YY2QHBGTS/action/timestamp_anchor","attest_storage":"https://pith.science/pith/XXJ73TDPIYVPN5CY4YY2QHBGTS/action/storage_attestation","attest_author":"https://pith.science/pith/XXJ73TDPIYVPN5CY4YY2QHBGTS/action/author_attestation","sign_citation":"https://pith.science/pith/XXJ73TDPIYVPN5CY4YY2QHBGTS/action/citation_signature","submit_replication":"https://pith.science/pith/XXJ73TDPIYVPN5CY4YY2QHBGTS/action/replication_record"}},"created_at":"2026-07-04T15:47:55.482853+00:00","updated_at":"2026-07-04T15:47:55.482853+00:00"}