{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:2KVUHD243RBL46YZDSTQUEB22C","short_pith_number":"pith:2KVUHD24","canonical_record":{"source":{"id":"1708.05161","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2017-08-17T07:41:49Z","cross_cats_sorted":["physics.ins-det"],"title_canon_sha256":"510dc72b52da17cddb506808e6ce1fddbde54feb8d37262bcbde11d44eb2faa4","abstract_canon_sha256":"248161cced2b3a74b11618129e7f463f5934544977ac6ad359b3a3163021c6e8"},"schema_version":"1.0"},"canonical_sha256":"d2ab438f5cdc42be7b191ca70a103ad0a2e7b3fcc6711cff2a39f8707fdd1ee7","source":{"kind":"arxiv","id":"1708.05161","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1708.05161","created_at":"2026-05-18T00:27:45Z"},{"alias_kind":"arxiv_version","alias_value":"1708.05161v2","created_at":"2026-05-18T00:27:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1708.05161","created_at":"2026-05-18T00:27:45Z"},{"alias_kind":"pith_short_12","alias_value":"2KVUHD243RBL","created_at":"2026-05-18T12:30:55Z"},{"alias_kind":"pith_short_16","alias_value":"2KVUHD243RBL46YZ","created_at":"2026-05-18T12:30:55Z"},{"alias_kind":"pith_short_8","alias_value":"2KVUHD24","created_at":"2026-05-18T12:30:55Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:2KVUHD243RBL46YZDSTQUEB22C","target":"record","payload":{"canonical_record":{"source":{"id":"1708.05161","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2017-08-17T07:41:49Z","cross_cats_sorted":["physics.ins-det"],"title_canon_sha256":"510dc72b52da17cddb506808e6ce1fddbde54feb8d37262bcbde11d44eb2faa4","abstract_canon_sha256":"248161cced2b3a74b11618129e7f463f5934544977ac6ad359b3a3163021c6e8"},"schema_version":"1.0"},"canonical_sha256":"d2ab438f5cdc42be7b191ca70a103ad0a2e7b3fcc6711cff2a39f8707fdd1ee7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:27:45.943335Z","signature_b64":"6LA4Tm3f63lLVqXdTONkUzhiRHGKjSQ35TOAMU5ZEDT0JwyRwTCKeWLI9CIsHexSDy4bj/PL5EZYM2SCL3cICQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d2ab438f5cdc42be7b191ca70a103ad0a2e7b3fcc6711cff2a39f8707fdd1ee7","last_reissued_at":"2026-05-18T00:27:45.942863Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:27:45.942863Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1708.05161","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:27:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"K+W6VpUJpN1sYYN7hU76pc0lSaP+ZFYyACc/pzxbjF7CA8iTGsDlT9DJUZW7mJQ3sMEdRz3f6Qs85+lFvQqaAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-20T17:23:52.315975Z"},"content_sha256":"855b9cea95c992771ade45ae7892b7f61f2e6d099191e38c9a781a1b12556417","schema_version":"1.0","event_id":"sha256:855b9cea95c992771ade45ae7892b7f61f2e6d099191e38c9a781a1b12556417"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:2KVUHD243RBL46YZDSTQUEB22C","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An ultrastable silicon cavity in a continuously operating closed-cycle cryostat at 4 K","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.ins-det"],"primary_cat":"physics.optics","authors_text":"C. Benko, D. G. Matei, E. Oelker, F. Riehle, J. L. Hall, J. M. Robinson, J. Ye, L. Sonderhouse, T. Legero, U. Sterr, W. Zhang","submitted_at":"2017-08-17T07:41:49Z","abstract_excerpt":"We report on a laser locked to a silicon cavity operating continuously at 4 K with $1 \\times 10^{-16}$ instability and a median linewidth of 17 mHz at 1542 nm. This is a ten-fold improvement in short-term instability, and a $10^4$ improvement in linewidth, over previous sub-10 K systems. Operating at low temperatures reduces the thermal noise floor, and thus is advantageous toward reaching an instability of $10^{-18}$, a long-sought goal of the optical clock community. The performance of this system demonstrates the technical readiness for the development of the next generation of ultrastable "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1708.05161","kind":"arxiv","version":2},"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":"2026-05-18T00:27:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OYgQrtSXKzVCjqd+pVJnuMiSOHbQlwXMZiDN7Qi1OyrYw5fRfrzcAKEdULW4llPY9kMoe1DevYNOiL4X9pfWCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-20T17:23:52.316342Z"},"content_sha256":"892c2a93204b896e21bb97d9df21c95d191eae2b385344d8369c975e004e1f6e","schema_version":"1.0","event_id":"sha256:892c2a93204b896e21bb97d9df21c95d191eae2b385344d8369c975e004e1f6e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2KVUHD243RBL46YZDSTQUEB22C/bundle.json","state_url":"https://pith.science/pith/2KVUHD243RBL46YZDSTQUEB22C/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2KVUHD243RBL46YZDSTQUEB22C/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":"2026-05-20T17:23:52Z","links":{"resolver":"https://pith.science/pith/2KVUHD243RBL46YZDSTQUEB22C","bundle":"https://pith.science/pith/2KVUHD243RBL46YZDSTQUEB22C/bundle.json","state":"https://pith.science/pith/2KVUHD243RBL46YZDSTQUEB22C/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2KVUHD243RBL46YZDSTQUEB22C/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:2KVUHD243RBL46YZDSTQUEB22C","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":"248161cced2b3a74b11618129e7f463f5934544977ac6ad359b3a3163021c6e8","cross_cats_sorted":["physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2017-08-17T07:41:49Z","title_canon_sha256":"510dc72b52da17cddb506808e6ce1fddbde54feb8d37262bcbde11d44eb2faa4"},"schema_version":"1.0","source":{"id":"1708.05161","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1708.05161","created_at":"2026-05-18T00:27:45Z"},{"alias_kind":"arxiv_version","alias_value":"1708.05161v2","created_at":"2026-05-18T00:27:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1708.05161","created_at":"2026-05-18T00:27:45Z"},{"alias_kind":"pith_short_12","alias_value":"2KVUHD243RBL","created_at":"2026-05-18T12:30:55Z"},{"alias_kind":"pith_short_16","alias_value":"2KVUHD243RBL46YZ","created_at":"2026-05-18T12:30:55Z"},{"alias_kind":"pith_short_8","alias_value":"2KVUHD24","created_at":"2026-05-18T12:30:55Z"}],"graph_snapshots":[{"event_id":"sha256:892c2a93204b896e21bb97d9df21c95d191eae2b385344d8369c975e004e1f6e","target":"graph","created_at":"2026-05-18T00:27:45Z","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 on a laser locked to a silicon cavity operating continuously at 4 K with $1 \\times 10^{-16}$ instability and a median linewidth of 17 mHz at 1542 nm. This is a ten-fold improvement in short-term instability, and a $10^4$ improvement in linewidth, over previous sub-10 K systems. Operating at low temperatures reduces the thermal noise floor, and thus is advantageous toward reaching an instability of $10^{-18}$, a long-sought goal of the optical clock community. The performance of this system demonstrates the technical readiness for the development of the next generation of ultrastable ","authors_text":"C. Benko, D. G. Matei, E. Oelker, F. Riehle, J. L. Hall, J. M. Robinson, J. Ye, L. Sonderhouse, T. Legero, U. Sterr, W. Zhang","cross_cats":["physics.ins-det"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2017-08-17T07:41:49Z","title":"An ultrastable silicon cavity in a continuously operating closed-cycle cryostat at 4 K"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1708.05161","kind":"arxiv","version":2},"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":"sha256:855b9cea95c992771ade45ae7892b7f61f2e6d099191e38c9a781a1b12556417","target":"record","created_at":"2026-05-18T00:27:45Z","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":"248161cced2b3a74b11618129e7f463f5934544977ac6ad359b3a3163021c6e8","cross_cats_sorted":["physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2017-08-17T07:41:49Z","title_canon_sha256":"510dc72b52da17cddb506808e6ce1fddbde54feb8d37262bcbde11d44eb2faa4"},"schema_version":"1.0","source":{"id":"1708.05161","kind":"arxiv","version":2}},"canonical_sha256":"d2ab438f5cdc42be7b191ca70a103ad0a2e7b3fcc6711cff2a39f8707fdd1ee7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d2ab438f5cdc42be7b191ca70a103ad0a2e7b3fcc6711cff2a39f8707fdd1ee7","first_computed_at":"2026-05-18T00:27:45.942863Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:27:45.942863Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"6LA4Tm3f63lLVqXdTONkUzhiRHGKjSQ35TOAMU5ZEDT0JwyRwTCKeWLI9CIsHexSDy4bj/PL5EZYM2SCL3cICQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:27:45.943335Z","signed_message":"canonical_sha256_bytes"},"source_id":"1708.05161","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:855b9cea95c992771ade45ae7892b7f61f2e6d099191e38c9a781a1b12556417","sha256:892c2a93204b896e21bb97d9df21c95d191eae2b385344d8369c975e004e1f6e"],"state_sha256":"1921c674507b7af37df3a10c7ac546d25348482930f8b40648a635f388702de0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7DXHTGEQfISKV52PKTt8mLaB/E+I8wmuiDqf6aOQuMC54slX+rop1idm5mq+ih+gyxKzncpucBNA8/WSpdJYAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-20T17:23:52.318581Z","bundle_sha256":"24a1a94afd588976180e5010c6d05cf82ebcc01f570cbf1a68284e88102f7432"}}