{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:U5ZMN7E73QQJDIE76Y6DGB4BIV","short_pith_number":"pith:U5ZMN7E7","canonical_record":{"source":{"id":"0909.2217","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-09-11T17:18:50Z","cross_cats_sorted":[],"title_canon_sha256":"250da77f42139c422f6d953eb1096abd2667d2458697e400ae724b631c4008f5","abstract_canon_sha256":"9d020f6114b1d5819265157b286c5a0a13983454df089993eba710ef11fbf8f2"},"schema_version":"1.0"},"canonical_sha256":"a772c6fc9fdc2091a09ff63c330781455badaa54d4884bac1aac97c12e669b13","source":{"kind":"arxiv","id":"0909.2217","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0909.2217","created_at":"2026-05-18T04:38:50Z"},{"alias_kind":"arxiv_version","alias_value":"0909.2217v1","created_at":"2026-05-18T04:38:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.2217","created_at":"2026-05-18T04:38:50Z"},{"alias_kind":"pith_short_12","alias_value":"U5ZMN7E73QQJ","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"U5ZMN7E73QQJDIE7","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"U5ZMN7E7","created_at":"2026-05-18T12:26:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:U5ZMN7E73QQJDIE76Y6DGB4BIV","target":"record","payload":{"canonical_record":{"source":{"id":"0909.2217","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-09-11T17:18:50Z","cross_cats_sorted":[],"title_canon_sha256":"250da77f42139c422f6d953eb1096abd2667d2458697e400ae724b631c4008f5","abstract_canon_sha256":"9d020f6114b1d5819265157b286c5a0a13983454df089993eba710ef11fbf8f2"},"schema_version":"1.0"},"canonical_sha256":"a772c6fc9fdc2091a09ff63c330781455badaa54d4884bac1aac97c12e669b13","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:38:50.856880Z","signature_b64":"byE2FsndJxxFQKJrkUSLFSHklwBJH/90fxz1rOiNxnHkkVZd7DmGZhiXlvUFR5zBaYVx68lkHYYDTWp9M2DwDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a772c6fc9fdc2091a09ff63c330781455badaa54d4884bac1aac97c12e669b13","last_reissued_at":"2026-05-18T04:38:50.856277Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:38:50.856277Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0909.2217","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:38:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PTNVo7p0xJils8dLVwODJGn0xZO9nCo0QmWljEr2MUpH04Sy6KL8ag49FxLSMmQbLMNt6WS4HqQJ5F7m47NxAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T14:52:27.035872Z"},"content_sha256":"525bc677d2d93f50852c064eb82146e9beb97e72180daeafc7d4f87cded6a136","schema_version":"1.0","event_id":"sha256:525bc677d2d93f50852c064eb82146e9beb97e72180daeafc7d4f87cded6a136"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:U5ZMN7E73QQJDIE76Y6DGB4BIV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Extraction of a squeezed state in a field mode via repeated measurements on an auxiliary quantum particle","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Bruno Bellomo, Giuseppe Compagno, Hiromichi Nakazato, Kazuya Yuasa","submitted_at":"2009-09-11T17:18:50Z","abstract_excerpt":"The dynamics of a system, consisting of a particle initially in a Gaussian state interacting with a field mode, under the action of repeated measurements performed on the particle, is examined. It is shown that regardless of its initial state the field is distilled into a squeezed state. The dependence on the physical parameters of the dynamics is investigated."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.2217","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:38:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"39WJglkPZTb1SgDy1/OxwxQdlFtMBbT2/xwe91pc7ebGH+G7O5V7wZQsTQPoF1XlYDD7c+W59hS+jPnXhQ2yDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T14:52:27.036484Z"},"content_sha256":"15406ade116a179ec4566762fbb593ccb3d670ba0dd146cad189b59552f3059a","schema_version":"1.0","event_id":"sha256:15406ade116a179ec4566762fbb593ccb3d670ba0dd146cad189b59552f3059a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/U5ZMN7E73QQJDIE76Y6DGB4BIV/bundle.json","state_url":"https://pith.science/pith/U5ZMN7E73QQJDIE76Y6DGB4BIV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/U5ZMN7E73QQJDIE76Y6DGB4BIV/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-06T14:52:27Z","links":{"resolver":"https://pith.science/pith/U5ZMN7E73QQJDIE76Y6DGB4BIV","bundle":"https://pith.science/pith/U5ZMN7E73QQJDIE76Y6DGB4BIV/bundle.json","state":"https://pith.science/pith/U5ZMN7E73QQJDIE76Y6DGB4BIV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/U5ZMN7E73QQJDIE76Y6DGB4BIV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:U5ZMN7E73QQJDIE76Y6DGB4BIV","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":"9d020f6114b1d5819265157b286c5a0a13983454df089993eba710ef11fbf8f2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-09-11T17:18:50Z","title_canon_sha256":"250da77f42139c422f6d953eb1096abd2667d2458697e400ae724b631c4008f5"},"schema_version":"1.0","source":{"id":"0909.2217","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0909.2217","created_at":"2026-05-18T04:38:50Z"},{"alias_kind":"arxiv_version","alias_value":"0909.2217v1","created_at":"2026-05-18T04:38:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.2217","created_at":"2026-05-18T04:38:50Z"},{"alias_kind":"pith_short_12","alias_value":"U5ZMN7E73QQJ","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"U5ZMN7E73QQJDIE7","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"U5ZMN7E7","created_at":"2026-05-18T12:26:02Z"}],"graph_snapshots":[{"event_id":"sha256:15406ade116a179ec4566762fbb593ccb3d670ba0dd146cad189b59552f3059a","target":"graph","created_at":"2026-05-18T04:38:50Z","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":"The dynamics of a system, consisting of a particle initially in a Gaussian state interacting with a field mode, under the action of repeated measurements performed on the particle, is examined. It is shown that regardless of its initial state the field is distilled into a squeezed state. The dependence on the physical parameters of the dynamics is investigated.","authors_text":"Bruno Bellomo, Giuseppe Compagno, Hiromichi Nakazato, Kazuya Yuasa","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-09-11T17:18:50Z","title":"Extraction of a squeezed state in a field mode via repeated measurements on an auxiliary quantum particle"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.2217","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":"sha256:525bc677d2d93f50852c064eb82146e9beb97e72180daeafc7d4f87cded6a136","target":"record","created_at":"2026-05-18T04:38:50Z","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":"9d020f6114b1d5819265157b286c5a0a13983454df089993eba710ef11fbf8f2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-09-11T17:18:50Z","title_canon_sha256":"250da77f42139c422f6d953eb1096abd2667d2458697e400ae724b631c4008f5"},"schema_version":"1.0","source":{"id":"0909.2217","kind":"arxiv","version":1}},"canonical_sha256":"a772c6fc9fdc2091a09ff63c330781455badaa54d4884bac1aac97c12e669b13","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a772c6fc9fdc2091a09ff63c330781455badaa54d4884bac1aac97c12e669b13","first_computed_at":"2026-05-18T04:38:50.856277Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:38:50.856277Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"byE2FsndJxxFQKJrkUSLFSHklwBJH/90fxz1rOiNxnHkkVZd7DmGZhiXlvUFR5zBaYVx68lkHYYDTWp9M2DwDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T04:38:50.856880Z","signed_message":"canonical_sha256_bytes"},"source_id":"0909.2217","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:525bc677d2d93f50852c064eb82146e9beb97e72180daeafc7d4f87cded6a136","sha256:15406ade116a179ec4566762fbb593ccb3d670ba0dd146cad189b59552f3059a"],"state_sha256":"7b9c73c40f35ed32abfba7419fec040607894ec5442de6b5481bd032aeddfa93"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pFxbMvJqXl3eDcBNyTOtm9WPSs9urRIzEd3ELYb6a8WKm68prYBaNmOzxEEC9QPvZ6pvvGJ5OBibbJDUd6FkAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-06T14:52:27.039911Z","bundle_sha256":"4af43c2cebe1e00fc27611c797a5fee8b3da8bad40d9e6d2d0a7cf4843dcf7b3"}}