{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2006:XLU55E4UK3CKCHOS5QC6DSM2QT","short_pith_number":"pith:XLU55E4U","canonical_record":{"source":{"id":"quant-ph/0603214","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"2006-03-23T18:05:40Z","cross_cats_sorted":[],"title_canon_sha256":"1a4b441aa5dcf6ac619b756ff3d5f4a1580a5c3116dfe10519327e1fc707293a","abstract_canon_sha256":"68a182c116069a91f4fe44db86d57b79294ffa6fd322a70d98d314237a0c6567"},"schema_version":"1.0"},"canonical_sha256":"bae9de939456c4a11dd2ec05e1c99a84ef802cdd9a211dd8cd1f068a57bbe328","source":{"kind":"arxiv","id":"quant-ph/0603214","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/0603214","created_at":"2026-05-18T01:37:56Z"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/0603214v1","created_at":"2026-05-18T01:37:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/0603214","created_at":"2026-05-18T01:37:56Z"},{"alias_kind":"pith_short_12","alias_value":"XLU55E4UK3CK","created_at":"2026-05-18T12:25:54Z"},{"alias_kind":"pith_short_16","alias_value":"XLU55E4UK3CKCHOS","created_at":"2026-05-18T12:25:54Z"},{"alias_kind":"pith_short_8","alias_value":"XLU55E4U","created_at":"2026-05-18T12:25:54Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2006:XLU55E4UK3CKCHOS5QC6DSM2QT","target":"record","payload":{"canonical_record":{"source":{"id":"quant-ph/0603214","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"2006-03-23T18:05:40Z","cross_cats_sorted":[],"title_canon_sha256":"1a4b441aa5dcf6ac619b756ff3d5f4a1580a5c3116dfe10519327e1fc707293a","abstract_canon_sha256":"68a182c116069a91f4fe44db86d57b79294ffa6fd322a70d98d314237a0c6567"},"schema_version":"1.0"},"canonical_sha256":"bae9de939456c4a11dd2ec05e1c99a84ef802cdd9a211dd8cd1f068a57bbe328","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:37:56.970648Z","signature_b64":"Fc+Z0lEgrLdUqD6l9nyzHbctolps8FcHqW3VNxK45noABWiI0wCVciEBieCbJUAw/+xsO6veLIPwZSOv0074Cw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bae9de939456c4a11dd2ec05e1c99a84ef802cdd9a211dd8cd1f068a57bbe328","last_reissued_at":"2026-05-18T01:37:56.969972Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:37:56.969972Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"quant-ph/0603214","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":"2026-05-18T01:37:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EO+sS496tMTtDhE9lRA9lZw6THRBXEOtEr4ZwKrN6aejJ5JGVsWSVDSSfZQvTNmCNwGq3ANgUoNhUL9TYQXCAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T21:47:06.300891Z"},"content_sha256":"ad63a633850656b4fc9622d2d8dc3dc2122cfc981b8384d4ca7ce77a3f785545","schema_version":"1.0","event_id":"sha256:ad63a633850656b4fc9622d2d8dc3dc2122cfc981b8384d4ca7ce77a3f785545"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2006:XLU55E4UK3CKCHOS5QC6DSM2QT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Generation of a squeezed vacuum resonant on Rubidium D_1 line with periodically-poled KTiOPO_4","license":"","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Akira Furusawa, Daisuke Akamatsu, Mikio Kozuma, Takahito Tanimura, Yoshihiko Yokoi","submitted_at":"2006-03-23T18:05:40Z","abstract_excerpt":"We report generation of a continuous-wave squeezed vacuum resonant on the Rb D_1 line (795 nm) using periodically poled KTiOPO_4 (PPKTP) crystals. With a frequency doubler and an optical parametric oscillator based on PPKTP crystals, we observed a squeezing level of -2.75 +- 0.14 dB and an anti-squeezing level of +7.00 +- 0.13 dB. This system could be utilized for demonstrating storage and retrieval of the squeezed vacuum, which is important for the ultra-precise measurement of atomic spins as well as quantum information processing."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/0603214","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":"2026-05-18T01:37:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EUYRId8RUNO6QQHUn35+zgEYghGR8y7w6qe+B+BZSIET67NyJX0UKCBKiLaRlrJAMRPYlbo5aUlOZFApqIpjAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T21:47:06.301223Z"},"content_sha256":"f58eb12bc5bb4282aece50d806df6783415877dd9e33c1c8a4d9ac4b8c5615f6","schema_version":"1.0","event_id":"sha256:f58eb12bc5bb4282aece50d806df6783415877dd9e33c1c8a4d9ac4b8c5615f6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XLU55E4UK3CKCHOS5QC6DSM2QT/bundle.json","state_url":"https://pith.science/pith/XLU55E4UK3CKCHOS5QC6DSM2QT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XLU55E4UK3CKCHOS5QC6DSM2QT/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":"2026-06-20T21:47:06Z","links":{"resolver":"https://pith.science/pith/XLU55E4UK3CKCHOS5QC6DSM2QT","bundle":"https://pith.science/pith/XLU55E4UK3CKCHOS5QC6DSM2QT/bundle.json","state":"https://pith.science/pith/XLU55E4UK3CKCHOS5QC6DSM2QT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XLU55E4UK3CKCHOS5QC6DSM2QT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2006:XLU55E4UK3CKCHOS5QC6DSM2QT","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":"68a182c116069a91f4fe44db86d57b79294ffa6fd322a70d98d314237a0c6567","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"2006-03-23T18:05:40Z","title_canon_sha256":"1a4b441aa5dcf6ac619b756ff3d5f4a1580a5c3116dfe10519327e1fc707293a"},"schema_version":"1.0","source":{"id":"quant-ph/0603214","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/0603214","created_at":"2026-05-18T01:37:56Z"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/0603214v1","created_at":"2026-05-18T01:37:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/0603214","created_at":"2026-05-18T01:37:56Z"},{"alias_kind":"pith_short_12","alias_value":"XLU55E4UK3CK","created_at":"2026-05-18T12:25:54Z"},{"alias_kind":"pith_short_16","alias_value":"XLU55E4UK3CKCHOS","created_at":"2026-05-18T12:25:54Z"},{"alias_kind":"pith_short_8","alias_value":"XLU55E4U","created_at":"2026-05-18T12:25:54Z"}],"graph_snapshots":[{"event_id":"sha256:f58eb12bc5bb4282aece50d806df6783415877dd9e33c1c8a4d9ac4b8c5615f6","target":"graph","created_at":"2026-05-18T01:37:56Z","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 report generation of a continuous-wave squeezed vacuum resonant on the Rb D_1 line (795 nm) using periodically poled KTiOPO_4 (PPKTP) crystals. With a frequency doubler and an optical parametric oscillator based on PPKTP crystals, we observed a squeezing level of -2.75 +- 0.14 dB and an anti-squeezing level of +7.00 +- 0.13 dB. This system could be utilized for demonstrating storage and retrieval of the squeezed vacuum, which is important for the ultra-precise measurement of atomic spins as well as quantum information processing.","authors_text":"Akira Furusawa, Daisuke Akamatsu, Mikio Kozuma, Takahito Tanimura, Yoshihiko Yokoi","cross_cats":[],"headline":"","license":"","primary_cat":"quant-ph","submitted_at":"2006-03-23T18:05:40Z","title":"Generation of a squeezed vacuum resonant on Rubidium D_1 line with periodically-poled KTiOPO_4"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/0603214","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:ad63a633850656b4fc9622d2d8dc3dc2122cfc981b8384d4ca7ce77a3f785545","target":"record","created_at":"2026-05-18T01:37:56Z","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":"68a182c116069a91f4fe44db86d57b79294ffa6fd322a70d98d314237a0c6567","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"2006-03-23T18:05:40Z","title_canon_sha256":"1a4b441aa5dcf6ac619b756ff3d5f4a1580a5c3116dfe10519327e1fc707293a"},"schema_version":"1.0","source":{"id":"quant-ph/0603214","kind":"arxiv","version":1}},"canonical_sha256":"bae9de939456c4a11dd2ec05e1c99a84ef802cdd9a211dd8cd1f068a57bbe328","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bae9de939456c4a11dd2ec05e1c99a84ef802cdd9a211dd8cd1f068a57bbe328","first_computed_at":"2026-05-18T01:37:56.969972Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:37:56.969972Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Fc+Z0lEgrLdUqD6l9nyzHbctolps8FcHqW3VNxK45noABWiI0wCVciEBieCbJUAw/+xsO6veLIPwZSOv0074Cw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:37:56.970648Z","signed_message":"canonical_sha256_bytes"},"source_id":"quant-ph/0603214","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ad63a633850656b4fc9622d2d8dc3dc2122cfc981b8384d4ca7ce77a3f785545","sha256:f58eb12bc5bb4282aece50d806df6783415877dd9e33c1c8a4d9ac4b8c5615f6"],"state_sha256":"0babefde619ed6379b374a2a2f6c9011287cd60bbea84a1b1cf1a98f85b07408"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QbhbYbKu8uIpAjVG4cIrtaSiAgr0RdSWgDwQnYMupE3yDiOJHpFwCA6fW16FUUxnp8UNNgYncBdBveCU9bqRDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-20T21:47:06.303066Z","bundle_sha256":"336c6971a1486effcad1d8a5d48c693a3152489ceb2a75f98265116ed260d6f6"}}