{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:4YZPF63D57MD63R32V7KXZSM74","short_pith_number":"pith:4YZPF63D","canonical_record":{"source":{"id":"1109.3731","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-09-16T21:36:21Z","cross_cats_sorted":[],"title_canon_sha256":"4fd6f7079d09899cc575ca613198d79d933dd167116cd8c28840224e6980dc21","abstract_canon_sha256":"ec1a70ef722f7c9a7cbe33a1595d98049edb5537979f6ff945a5cff8000de5d4"},"schema_version":"1.0"},"canonical_sha256":"e632f2fb63efd83f6e3bd57eabe64cff1320facdc5a387f05a04247fece12fc2","source":{"kind":"arxiv","id":"1109.3731","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1109.3731","created_at":"2026-05-18T02:00:31Z"},{"alias_kind":"arxiv_version","alias_value":"1109.3731v1","created_at":"2026-05-18T02:00:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1109.3731","created_at":"2026-05-18T02:00:31Z"},{"alias_kind":"pith_short_12","alias_value":"4YZPF63D57MD","created_at":"2026-05-18T12:26:20Z"},{"alias_kind":"pith_short_16","alias_value":"4YZPF63D57MD63R3","created_at":"2026-05-18T12:26:20Z"},{"alias_kind":"pith_short_8","alias_value":"4YZPF63D","created_at":"2026-05-18T12:26:20Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:4YZPF63D57MD63R32V7KXZSM74","target":"record","payload":{"canonical_record":{"source":{"id":"1109.3731","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-09-16T21:36:21Z","cross_cats_sorted":[],"title_canon_sha256":"4fd6f7079d09899cc575ca613198d79d933dd167116cd8c28840224e6980dc21","abstract_canon_sha256":"ec1a70ef722f7c9a7cbe33a1595d98049edb5537979f6ff945a5cff8000de5d4"},"schema_version":"1.0"},"canonical_sha256":"e632f2fb63efd83f6e3bd57eabe64cff1320facdc5a387f05a04247fece12fc2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:00:31.563193Z","signature_b64":"Ejf8FWmadRpjBXIWgCErmiscpxuZN/1DsQbgJDgJKsfWHWHWjHuge6D1/gNuZuSbz5qFrgLo6deuwiTQetoYCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e632f2fb63efd83f6e3bd57eabe64cff1320facdc5a387f05a04247fece12fc2","last_reissued_at":"2026-05-18T02:00:31.562643Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:00:31.562643Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1109.3731","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":"2026-05-18T02:00:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"38hby2/ZP33F7D0ACOf+QDrHj0YHCEQISxvDMNn3c5iB2dhiRKmU8++hHQ1Z13pvGG3KBLLk3IEX4VgFAjXZAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-01T04:52:57.539584Z"},"content_sha256":"6cd6ca65b9815f26e419803047a87385286b468d7e4d7cacea2d34fb221f83af","schema_version":"1.0","event_id":"sha256:6cd6ca65b9815f26e419803047a87385286b468d7e4d7cacea2d34fb221f83af"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:4YZPF63D57MD63R32V7KXZSM74","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Long-term stable squeezed vacuum state of light for gravitational wave detectors","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Alexander Khalaidovski, Christian Graef, Hartmut Grote, Henning Vahlbruch, Karsten Danzmann, Nico Lastzka, Roman Schnabel","submitted_at":"2011-09-16T21:36:21Z","abstract_excerpt":"Currently, the German/British gravitational wave detector GEO600 is being upgraded in course of the GEO-HF program. One part of this upgrade consists of the integration of a squeezed light laser to nonclassically improve the detection sensitivity at frequencies where the instrument is limited by shot noise. This has been achieved recently [1]. The permanent employment of squeezed light in gravitational wave observatories requires a long-term stability of the generated squeezed state. In this paper, we discuss an unwanted mechanism that can lead to a varying squeezing factor along with a changi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1109.3731","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":"2026-05-18T02:00:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"taz3OYjwweZD3VsNbL+aW1PI+l5CDIADJmOpve5kzu0rUA7Hgr7p1J9be30/8JsLmTuPqMUhr99RxmAfdopLDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-01T04:52:57.540039Z"},"content_sha256":"9d67cc8f4d45fbd24fc899a41cc610599cfc378a21756fe956b045fd3c97d8ec","schema_version":"1.0","event_id":"sha256:9d67cc8f4d45fbd24fc899a41cc610599cfc378a21756fe956b045fd3c97d8ec"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4YZPF63D57MD63R32V7KXZSM74/bundle.json","state_url":"https://pith.science/pith/4YZPF63D57MD63R32V7KXZSM74/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4YZPF63D57MD63R32V7KXZSM74/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":"2026-08-01T04:52:57Z","links":{"resolver":"https://pith.science/pith/4YZPF63D57MD63R32V7KXZSM74","bundle":"https://pith.science/pith/4YZPF63D57MD63R32V7KXZSM74/bundle.json","state":"https://pith.science/pith/4YZPF63D57MD63R32V7KXZSM74/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4YZPF63D57MD63R32V7KXZSM74/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:4YZPF63D57MD63R32V7KXZSM74","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":"ec1a70ef722f7c9a7cbe33a1595d98049edb5537979f6ff945a5cff8000de5d4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-09-16T21:36:21Z","title_canon_sha256":"4fd6f7079d09899cc575ca613198d79d933dd167116cd8c28840224e6980dc21"},"schema_version":"1.0","source":{"id":"1109.3731","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1109.3731","created_at":"2026-05-18T02:00:31Z"},{"alias_kind":"arxiv_version","alias_value":"1109.3731v1","created_at":"2026-05-18T02:00:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1109.3731","created_at":"2026-05-18T02:00:31Z"},{"alias_kind":"pith_short_12","alias_value":"4YZPF63D57MD","created_at":"2026-05-18T12:26:20Z"},{"alias_kind":"pith_short_16","alias_value":"4YZPF63D57MD63R3","created_at":"2026-05-18T12:26:20Z"},{"alias_kind":"pith_short_8","alias_value":"4YZPF63D","created_at":"2026-05-18T12:26:20Z"}],"graph_snapshots":[{"event_id":"sha256:9d67cc8f4d45fbd24fc899a41cc610599cfc378a21756fe956b045fd3c97d8ec","target":"graph","created_at":"2026-05-18T02:00:31Z","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":"Currently, the German/British gravitational wave detector GEO600 is being upgraded in course of the GEO-HF program. One part of this upgrade consists of the integration of a squeezed light laser to nonclassically improve the detection sensitivity at frequencies where the instrument is limited by shot noise. This has been achieved recently [1]. The permanent employment of squeezed light in gravitational wave observatories requires a long-term stability of the generated squeezed state. In this paper, we discuss an unwanted mechanism that can lead to a varying squeezing factor along with a changi","authors_text":"Alexander Khalaidovski, Christian Graef, Hartmut Grote, Henning Vahlbruch, Karsten Danzmann, Nico Lastzka, Roman Schnabel","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-09-16T21:36:21Z","title":"Long-term stable squeezed vacuum state of light for gravitational wave detectors"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1109.3731","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":"sha256:6cd6ca65b9815f26e419803047a87385286b468d7e4d7cacea2d34fb221f83af","target":"record","created_at":"2026-05-18T02:00:31Z","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":"ec1a70ef722f7c9a7cbe33a1595d98049edb5537979f6ff945a5cff8000de5d4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-09-16T21:36:21Z","title_canon_sha256":"4fd6f7079d09899cc575ca613198d79d933dd167116cd8c28840224e6980dc21"},"schema_version":"1.0","source":{"id":"1109.3731","kind":"arxiv","version":1}},"canonical_sha256":"e632f2fb63efd83f6e3bd57eabe64cff1320facdc5a387f05a04247fece12fc2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e632f2fb63efd83f6e3bd57eabe64cff1320facdc5a387f05a04247fece12fc2","first_computed_at":"2026-05-18T02:00:31.562643Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:00:31.562643Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Ejf8FWmadRpjBXIWgCErmiscpxuZN/1DsQbgJDgJKsfWHWHWjHuge6D1/gNuZuSbz5qFrgLo6deuwiTQetoYCA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:00:31.563193Z","signed_message":"canonical_sha256_bytes"},"source_id":"1109.3731","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6cd6ca65b9815f26e419803047a87385286b468d7e4d7cacea2d34fb221f83af","sha256:9d67cc8f4d45fbd24fc899a41cc610599cfc378a21756fe956b045fd3c97d8ec"],"state_sha256":"1ac8355792bd47fcf729afdecd0522eb1612648e24756580e7dddcda0b405b73"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3IOuxiHpKwgKP+VCuHTg+pJG5gJjsvdFU8qLJbm58/+iyT0pQKtSy7o1I6qWOnmi38EoCQ03Hgmp7HEcgOf9CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-01T04:52:57.543340Z","bundle_sha256":"1780ac6e6e8638a97b4032059c916094086184717dea2fa9b499c2bfa35d9fdd"}}