{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:TT2HP7MJNBIOAQWOL4D25DQLOG","short_pith_number":"pith:TT2HP7MJ","canonical_record":{"source":{"id":"1002.2819","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-02-15T02:49:34Z","cross_cats_sorted":[],"title_canon_sha256":"de4f82a9914d38acf924fe79d1754574d02d4af3b1e81ec80b6d59a9859a1fae","abstract_canon_sha256":"4cef8156c0254b7a8d53c528badb87ad0aaa887f7d56eeaa4422ba0f71b58f44"},"schema_version":"1.0"},"canonical_sha256":"9cf477fd896850e042ce5f07ae8e0b71adb8bc0f9384151d4d1f7143f1ac6f93","source":{"kind":"arxiv","id":"1002.2819","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1002.2819","created_at":"2026-05-18T00:37:05Z"},{"alias_kind":"arxiv_version","alias_value":"1002.2819v1","created_at":"2026-05-18T00:37:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1002.2819","created_at":"2026-05-18T00:37:05Z"},{"alias_kind":"pith_short_12","alias_value":"TT2HP7MJNBIO","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_16","alias_value":"TT2HP7MJNBIOAQWO","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_8","alias_value":"TT2HP7MJ","created_at":"2026-05-18T12:26:15Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:TT2HP7MJNBIOAQWOL4D25DQLOG","target":"record","payload":{"canonical_record":{"source":{"id":"1002.2819","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-02-15T02:49:34Z","cross_cats_sorted":[],"title_canon_sha256":"de4f82a9914d38acf924fe79d1754574d02d4af3b1e81ec80b6d59a9859a1fae","abstract_canon_sha256":"4cef8156c0254b7a8d53c528badb87ad0aaa887f7d56eeaa4422ba0f71b58f44"},"schema_version":"1.0"},"canonical_sha256":"9cf477fd896850e042ce5f07ae8e0b71adb8bc0f9384151d4d1f7143f1ac6f93","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:37:05.723531Z","signature_b64":"pRJ188jPbz8e4WndtUlS+tPeBwoaH4orL5bklSK8uwFtlXGdITtyuF++eC8fo6Ce4tcXEj5fAytZjlJvgepADA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9cf477fd896850e042ce5f07ae8e0b71adb8bc0f9384151d4d1f7143f1ac6f93","last_reissued_at":"2026-05-18T00:37:05.722931Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:37:05.722931Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1002.2819","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":"2026-05-18T00:37:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MBJiwqKngE8neSwuRYtCJNUo1v6a4DwcKipmznW7Vi9S4UY65xRQtTRnACLbGRpNbnSLAtXJzVXh1GheoLeLDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T05:08:54.548511Z"},"content_sha256":"bc5d61adbf100525a708302a9e5da67557c6ae3a0738286f735c511d6f257c55","schema_version":"1.0","event_id":"sha256:bc5d61adbf100525a708302a9e5da67557c6ae3a0738286f735c511d6f257c55"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:TT2HP7MJNBIOAQWOL4D25DQLOG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Sub-shot-noise-limit discrimination of on-off keyed coherent signals via a quantum receiver with a superconducting transition edge sensor","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Daiji Fukuda, Go Fujii, Kenji Tsujino, Masahide Sasaki, Masahiro Takeoka, Mikio Fujiwara, Shuichiro Inoue","submitted_at":"2010-02-15T02:49:34Z","abstract_excerpt":"We demonstrate a sub-shot-noise-limit discrimination of on-off keyed coherent signals by an optimal displacement quantum receiver in which a superconducting transition edge sensor is installed. Use of a transition edge sensor and a fiber beam splitter realizes high total detection efficiency and high interference visibility of the receiver and the observed average error surpasses the shot-noise-limit in a wider range of the signal power. Our technique opens up a new technology for the sub-shot-noise-limit detection of coherent signals in optical communication channels."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1002.2819","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":"2026-05-18T00:37:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"It6/y4OPLjZvMP1UKF0W4VqCjYMQvN1XNPagDGGWKigHEmyVISHRqpkSM2L/TIlxERSDV9NjHEroHXfPL8BqDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T05:08:54.548901Z"},"content_sha256":"d16efc06745530393e544d17c021e55477415b3422ec082636505fe1697d7d0f","schema_version":"1.0","event_id":"sha256:d16efc06745530393e544d17c021e55477415b3422ec082636505fe1697d7d0f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/TT2HP7MJNBIOAQWOL4D25DQLOG/bundle.json","state_url":"https://pith.science/pith/TT2HP7MJNBIOAQWOL4D25DQLOG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/TT2HP7MJNBIOAQWOL4D25DQLOG/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":"2026-05-31T05:08:54Z","links":{"resolver":"https://pith.science/pith/TT2HP7MJNBIOAQWOL4D25DQLOG","bundle":"https://pith.science/pith/TT2HP7MJNBIOAQWOL4D25DQLOG/bundle.json","state":"https://pith.science/pith/TT2HP7MJNBIOAQWOL4D25DQLOG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/TT2HP7MJNBIOAQWOL4D25DQLOG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:TT2HP7MJNBIOAQWOL4D25DQLOG","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":"4cef8156c0254b7a8d53c528badb87ad0aaa887f7d56eeaa4422ba0f71b58f44","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-02-15T02:49:34Z","title_canon_sha256":"de4f82a9914d38acf924fe79d1754574d02d4af3b1e81ec80b6d59a9859a1fae"},"schema_version":"1.0","source":{"id":"1002.2819","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1002.2819","created_at":"2026-05-18T00:37:05Z"},{"alias_kind":"arxiv_version","alias_value":"1002.2819v1","created_at":"2026-05-18T00:37:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1002.2819","created_at":"2026-05-18T00:37:05Z"},{"alias_kind":"pith_short_12","alias_value":"TT2HP7MJNBIO","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_16","alias_value":"TT2HP7MJNBIOAQWO","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_8","alias_value":"TT2HP7MJ","created_at":"2026-05-18T12:26:15Z"}],"graph_snapshots":[{"event_id":"sha256:d16efc06745530393e544d17c021e55477415b3422ec082636505fe1697d7d0f","target":"graph","created_at":"2026-05-18T00:37:05Z","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 demonstrate a sub-shot-noise-limit discrimination of on-off keyed coherent signals by an optimal displacement quantum receiver in which a superconducting transition edge sensor is installed. Use of a transition edge sensor and a fiber beam splitter realizes high total detection efficiency and high interference visibility of the receiver and the observed average error surpasses the shot-noise-limit in a wider range of the signal power. Our technique opens up a new technology for the sub-shot-noise-limit detection of coherent signals in optical communication channels.","authors_text":"Daiji Fukuda, Go Fujii, Kenji Tsujino, Masahide Sasaki, Masahiro Takeoka, Mikio Fujiwara, Shuichiro Inoue","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-02-15T02:49:34Z","title":"Sub-shot-noise-limit discrimination of on-off keyed coherent signals via a quantum receiver with a superconducting transition edge sensor"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1002.2819","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:bc5d61adbf100525a708302a9e5da67557c6ae3a0738286f735c511d6f257c55","target":"record","created_at":"2026-05-18T00:37:05Z","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":"4cef8156c0254b7a8d53c528badb87ad0aaa887f7d56eeaa4422ba0f71b58f44","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-02-15T02:49:34Z","title_canon_sha256":"de4f82a9914d38acf924fe79d1754574d02d4af3b1e81ec80b6d59a9859a1fae"},"schema_version":"1.0","source":{"id":"1002.2819","kind":"arxiv","version":1}},"canonical_sha256":"9cf477fd896850e042ce5f07ae8e0b71adb8bc0f9384151d4d1f7143f1ac6f93","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9cf477fd896850e042ce5f07ae8e0b71adb8bc0f9384151d4d1f7143f1ac6f93","first_computed_at":"2026-05-18T00:37:05.722931Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:37:05.722931Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"pRJ188jPbz8e4WndtUlS+tPeBwoaH4orL5bklSK8uwFtlXGdITtyuF++eC8fo6Ce4tcXEj5fAytZjlJvgepADA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:37:05.723531Z","signed_message":"canonical_sha256_bytes"},"source_id":"1002.2819","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bc5d61adbf100525a708302a9e5da67557c6ae3a0738286f735c511d6f257c55","sha256:d16efc06745530393e544d17c021e55477415b3422ec082636505fe1697d7d0f"],"state_sha256":"018b3ecd3fc78337d343807376d54f203e71d37819ba92687ff89a296cfa0cbb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"auLxhIi7xkTVkHmqwITOaV7aZVhPEGrKfPYjhrqeaX0jWazeO5cQBtFMxrhGDEWgey8MAWz4cib6a3fOxvYECQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T05:08:54.551159Z","bundle_sha256":"60fb672c9b4d0368d6fe3858d94fedb76b7891d7cd09a0fba83ac72d4e83fd12"}}