{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:UCB2CYZSMEU4EZXGED7TCYLKSB","short_pith_number":"pith:UCB2CYZS","canonical_record":{"source":{"id":"1003.1056","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-03-04T17:42:18Z","cross_cats_sorted":[],"title_canon_sha256":"3cee75605bf97b8394508915c40b8a99a9e8ce153c9f62295954a59c95a2e4e0","abstract_canon_sha256":"fd03e2cec6ebe4957086d8320cef7c47c0fd26d6126d85adc2b92f3dd110d960"},"schema_version":"1.0"},"canonical_sha256":"a083a163326129c266e620ff31616a904de17d1d550a05c74bcf04618e3347e3","source":{"kind":"arxiv","id":"1003.1056","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1003.1056","created_at":"2026-05-18T02:08:46Z"},{"alias_kind":"arxiv_version","alias_value":"1003.1056v3","created_at":"2026-05-18T02:08:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1003.1056","created_at":"2026-05-18T02:08:46Z"},{"alias_kind":"pith_short_12","alias_value":"UCB2CYZSMEU4","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_16","alias_value":"UCB2CYZSMEU4EZXG","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_8","alias_value":"UCB2CYZS","created_at":"2026-05-18T12:26:15Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:UCB2CYZSMEU4EZXGED7TCYLKSB","target":"record","payload":{"canonical_record":{"source":{"id":"1003.1056","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-03-04T17:42:18Z","cross_cats_sorted":[],"title_canon_sha256":"3cee75605bf97b8394508915c40b8a99a9e8ce153c9f62295954a59c95a2e4e0","abstract_canon_sha256":"fd03e2cec6ebe4957086d8320cef7c47c0fd26d6126d85adc2b92f3dd110d960"},"schema_version":"1.0"},"canonical_sha256":"a083a163326129c266e620ff31616a904de17d1d550a05c74bcf04618e3347e3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:08:46.339412Z","signature_b64":"gfEcSbXhSWpoicgrWtn4+lhlVaIW1V/8d1dci8P/A6JLMGFR+tx8RW3JM7gIXDjfpt/a2ViDtsaUY5s1uO6vBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a083a163326129c266e620ff31616a904de17d1d550a05c74bcf04618e3347e3","last_reissued_at":"2026-05-18T02:08:46.338760Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:08:46.338760Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1003.1056","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:08:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RxdHakWhpKzQtRmUTs6jXyn/b4eX2IUZQEY5on5yIZKddYkzvqUHXtfp3L0ysBTWdL1FeFmf+Ml2CNP64E/vDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T20:05:39.211384Z"},"content_sha256":"2ec9c6290e628e5c387f33a1647b388755a427ecda8010157da2f6b5d638e06f","schema_version":"1.0","event_id":"sha256:2ec9c6290e628e5c387f33a1647b388755a427ecda8010157da2f6b5d638e06f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:UCB2CYZSMEU4EZXGED7TCYLKSB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Experimental study on discretely modulated continuous-variable quantum key distribution","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Hongxin Zou, Jianmin Yuan, Liang Tian, Pingxing Chen, Yong Shen","submitted_at":"2010-03-04T17:42:18Z","abstract_excerpt":"We present a discretely modulated continuous-variable quantum key distribution system in free space by using strong coherent states. The amplitude noise in the laser source is suppressed to the shot-noise limit by using a mode cleaner combined with a frequency shift technique. Also, it is proven that the phase noise in the source has no impact on the final secret key rate. In order to increase the encoding rate, we use broadband homodyne detectors and the no-switching protocol. In a realistic model, we establish a secret key rate of 46.8 kbits/s against collective attacks at an encoding rate o"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1003.1056","kind":"arxiv","version":3},"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":"2026-05-18T02:08:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jaVL3HM2/ptFeGB4GPgyZ4OIDqCe9fuQbYY8HIlFvn0bWlWtCOzNwnzYvN0hJGUqaufUgskv9dDAQeypK6eGDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T20:05:39.211980Z"},"content_sha256":"5a851148a94aa16f50cc1299c2b893668bb948c1a6e90009036a1a4f037c55f2","schema_version":"1.0","event_id":"sha256:5a851148a94aa16f50cc1299c2b893668bb948c1a6e90009036a1a4f037c55f2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UCB2CYZSMEU4EZXGED7TCYLKSB/bundle.json","state_url":"https://pith.science/pith/UCB2CYZSMEU4EZXGED7TCYLKSB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UCB2CYZSMEU4EZXGED7TCYLKSB/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":"2026-05-29T20:05:39Z","links":{"resolver":"https://pith.science/pith/UCB2CYZSMEU4EZXGED7TCYLKSB","bundle":"https://pith.science/pith/UCB2CYZSMEU4EZXGED7TCYLKSB/bundle.json","state":"https://pith.science/pith/UCB2CYZSMEU4EZXGED7TCYLKSB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UCB2CYZSMEU4EZXGED7TCYLKSB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:UCB2CYZSMEU4EZXGED7TCYLKSB","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":"fd03e2cec6ebe4957086d8320cef7c47c0fd26d6126d85adc2b92f3dd110d960","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-03-04T17:42:18Z","title_canon_sha256":"3cee75605bf97b8394508915c40b8a99a9e8ce153c9f62295954a59c95a2e4e0"},"schema_version":"1.0","source":{"id":"1003.1056","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1003.1056","created_at":"2026-05-18T02:08:46Z"},{"alias_kind":"arxiv_version","alias_value":"1003.1056v3","created_at":"2026-05-18T02:08:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1003.1056","created_at":"2026-05-18T02:08:46Z"},{"alias_kind":"pith_short_12","alias_value":"UCB2CYZSMEU4","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_16","alias_value":"UCB2CYZSMEU4EZXG","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_8","alias_value":"UCB2CYZS","created_at":"2026-05-18T12:26:15Z"}],"graph_snapshots":[{"event_id":"sha256:5a851148a94aa16f50cc1299c2b893668bb948c1a6e90009036a1a4f037c55f2","target":"graph","created_at":"2026-05-18T02:08:46Z","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 present a discretely modulated continuous-variable quantum key distribution system in free space by using strong coherent states. The amplitude noise in the laser source is suppressed to the shot-noise limit by using a mode cleaner combined with a frequency shift technique. Also, it is proven that the phase noise in the source has no impact on the final secret key rate. In order to increase the encoding rate, we use broadband homodyne detectors and the no-switching protocol. In a realistic model, we establish a secret key rate of 46.8 kbits/s against collective attacks at an encoding rate o","authors_text":"Hongxin Zou, Jianmin Yuan, Liang Tian, Pingxing Chen, Yong Shen","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-03-04T17:42:18Z","title":"Experimental study on discretely modulated continuous-variable quantum key distribution"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1003.1056","kind":"arxiv","version":3},"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":"sha256:2ec9c6290e628e5c387f33a1647b388755a427ecda8010157da2f6b5d638e06f","target":"record","created_at":"2026-05-18T02:08:46Z","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":"fd03e2cec6ebe4957086d8320cef7c47c0fd26d6126d85adc2b92f3dd110d960","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-03-04T17:42:18Z","title_canon_sha256":"3cee75605bf97b8394508915c40b8a99a9e8ce153c9f62295954a59c95a2e4e0"},"schema_version":"1.0","source":{"id":"1003.1056","kind":"arxiv","version":3}},"canonical_sha256":"a083a163326129c266e620ff31616a904de17d1d550a05c74bcf04618e3347e3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a083a163326129c266e620ff31616a904de17d1d550a05c74bcf04618e3347e3","first_computed_at":"2026-05-18T02:08:46.338760Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:08:46.338760Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gfEcSbXhSWpoicgrWtn4+lhlVaIW1V/8d1dci8P/A6JLMGFR+tx8RW3JM7gIXDjfpt/a2ViDtsaUY5s1uO6vBA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:08:46.339412Z","signed_message":"canonical_sha256_bytes"},"source_id":"1003.1056","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2ec9c6290e628e5c387f33a1647b388755a427ecda8010157da2f6b5d638e06f","sha256:5a851148a94aa16f50cc1299c2b893668bb948c1a6e90009036a1a4f037c55f2"],"state_sha256":"790d84f1c45e8c937f9d6645a33e421dc4904e1079472909f546acef7235c7c9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7W3fg/FBuj59psNTc3nVZbYlA93y/nblut8G/riDhnig5k54SFx0kRO0Qv7142MvA344QxQAYv8awZxUSaYfBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-29T20:05:39.215779Z","bundle_sha256":"06d4b63718312a029f54f4714abf8ea30072e5e8d5cd8c446c85b4bd8f9bea0c"}}