{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:Z7BEXXLVWKXX3Y2FCXKKRWHIEX","short_pith_number":"pith:Z7BEXXLV","canonical_record":{"source":{"id":"0803.1594","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-03-11T14:14:53Z","cross_cats_sorted":[],"title_canon_sha256":"6a730b2c53c1d87a6510cfd42ebbfe01ef3e133e8f667e742b707c99ead77c13","abstract_canon_sha256":"a7e6a79a06ba8d350d15450b7f2f74cd7f5ffd3cc962503b04cdf250e1ad3b6e"},"schema_version":"1.0"},"canonical_sha256":"cfc24bdd75b2af7de34515d4a8d8e825f19febdae56af01d086f1a687c15454d","source":{"kind":"arxiv","id":"0803.1594","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0803.1594","created_at":"2026-07-04T15:12:16Z"},{"alias_kind":"arxiv_version","alias_value":"0803.1594v1","created_at":"2026-07-04T15:12:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0803.1594","created_at":"2026-07-04T15:12:16Z"},{"alias_kind":"pith_short_12","alias_value":"Z7BEXXLVWKXX","created_at":"2026-07-04T15:12:16Z"},{"alias_kind":"pith_short_16","alias_value":"Z7BEXXLVWKXX3Y2F","created_at":"2026-07-04T15:12:16Z"},{"alias_kind":"pith_short_8","alias_value":"Z7BEXXLV","created_at":"2026-07-04T15:12:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:Z7BEXXLVWKXX3Y2FCXKKRWHIEX","target":"record","payload":{"canonical_record":{"source":{"id":"0803.1594","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-03-11T14:14:53Z","cross_cats_sorted":[],"title_canon_sha256":"6a730b2c53c1d87a6510cfd42ebbfe01ef3e133e8f667e742b707c99ead77c13","abstract_canon_sha256":"a7e6a79a06ba8d350d15450b7f2f74cd7f5ffd3cc962503b04cdf250e1ad3b6e"},"schema_version":"1.0"},"canonical_sha256":"cfc24bdd75b2af7de34515d4a8d8e825f19febdae56af01d086f1a687c15454d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:12:16.952611Z","signature_b64":"61zEBPn0p5ay8Xwy7PAU112CKPtmws6vG7D8MyWoSvOxawREw3Dc4dhB9iM/+YBqmu0k5P/xSFuCA+3M0QyqBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cfc24bdd75b2af7de34515d4a8d8e825f19febdae56af01d086f1a687c15454d","last_reissued_at":"2026-07-04T15:12:16.952218Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:12:16.952218Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0803.1594","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":"2026-07-04T15:12:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4ds/mwYrzb1Ww827g44xtF2XoBASfRjvyBEX2eDqYsnOFTfGEmowkE1lz/hL9rKid8RVIhhY1Yx0baM4sEDrCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T03:34:56.205508Z"},"content_sha256":"205405e83bfcc667603c11a354e2a502f05b85c48eb18eb269f31c5f44d9ae92","schema_version":"1.0","event_id":"sha256:205405e83bfcc667603c11a354e2a502f05b85c48eb18eb269f31c5f44d9ae92"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:Z7BEXXLVWKXX3Y2FCXKKRWHIEX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Decoy states for quantum key distribution based on decoherence-free subspaces","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Guang-Can Guo, Yi-bo Zhao, Zheng-Fu Han, Zheng-Wei Zhou, Zhen-Qiang Yin","submitted_at":"2008-03-11T14:14:53Z","abstract_excerpt":"Quantum key distribution with decoherence-free subspaces has been proposed to overcome the collective noise to the polarization modes of photons flying in quantum channel. Prototype of this scheme have also been achieved with parametric-down conversion source. However, a novel type of photon-number-splitting attack we proposed in this paper will make the practical implementations of this scheme insecure since the parametric-down conversion source may emit multi-photon pairs occasionally. We propose decoy states method to make these implementations immune to this attack. And with this decoy sta"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0803.1594","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/0803.1594/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-04T15:12:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GnIZW3ciboqqKwFnPij9juBTfj7hUaZb69iMVp0y1Ag1TnZI+z2tOugq8AGTJeFp1Iu4zaTwCjFX4jCXTkCYCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T03:34:56.205899Z"},"content_sha256":"6d1022094d2720ac488661b7d108a967bf1d14d2f402d2d4eaa4afd66dd0c616","schema_version":"1.0","event_id":"sha256:6d1022094d2720ac488661b7d108a967bf1d14d2f402d2d4eaa4afd66dd0c616"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Z7BEXXLVWKXX3Y2FCXKKRWHIEX/bundle.json","state_url":"https://pith.science/pith/Z7BEXXLVWKXX3Y2FCXKKRWHIEX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Z7BEXXLVWKXX3Y2FCXKKRWHIEX/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":"2026-07-05T03:34:56Z","links":{"resolver":"https://pith.science/pith/Z7BEXXLVWKXX3Y2FCXKKRWHIEX","bundle":"https://pith.science/pith/Z7BEXXLVWKXX3Y2FCXKKRWHIEX/bundle.json","state":"https://pith.science/pith/Z7BEXXLVWKXX3Y2FCXKKRWHIEX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Z7BEXXLVWKXX3Y2FCXKKRWHIEX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:Z7BEXXLVWKXX3Y2FCXKKRWHIEX","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":"a7e6a79a06ba8d350d15450b7f2f74cd7f5ffd3cc962503b04cdf250e1ad3b6e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-03-11T14:14:53Z","title_canon_sha256":"6a730b2c53c1d87a6510cfd42ebbfe01ef3e133e8f667e742b707c99ead77c13"},"schema_version":"1.0","source":{"id":"0803.1594","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0803.1594","created_at":"2026-07-04T15:12:16Z"},{"alias_kind":"arxiv_version","alias_value":"0803.1594v1","created_at":"2026-07-04T15:12:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0803.1594","created_at":"2026-07-04T15:12:16Z"},{"alias_kind":"pith_short_12","alias_value":"Z7BEXXLVWKXX","created_at":"2026-07-04T15:12:16Z"},{"alias_kind":"pith_short_16","alias_value":"Z7BEXXLVWKXX3Y2F","created_at":"2026-07-04T15:12:16Z"},{"alias_kind":"pith_short_8","alias_value":"Z7BEXXLV","created_at":"2026-07-04T15:12:16Z"}],"graph_snapshots":[{"event_id":"sha256:6d1022094d2720ac488661b7d108a967bf1d14d2f402d2d4eaa4afd66dd0c616","target":"graph","created_at":"2026-07-04T15:12:16Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/0803.1594/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Quantum key distribution with decoherence-free subspaces has been proposed to overcome the collective noise to the polarization modes of photons flying in quantum channel. Prototype of this scheme have also been achieved with parametric-down conversion source. However, a novel type of photon-number-splitting attack we proposed in this paper will make the practical implementations of this scheme insecure since the parametric-down conversion source may emit multi-photon pairs occasionally. We propose decoy states method to make these implementations immune to this attack. And with this decoy sta","authors_text":"Guang-Can Guo, Yi-bo Zhao, Zheng-Fu Han, Zheng-Wei Zhou, Zhen-Qiang Yin","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-03-11T14:14:53Z","title":"Decoy states for quantum key distribution based on decoherence-free subspaces"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0803.1594","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":"sha256:205405e83bfcc667603c11a354e2a502f05b85c48eb18eb269f31c5f44d9ae92","target":"record","created_at":"2026-07-04T15:12:16Z","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":"a7e6a79a06ba8d350d15450b7f2f74cd7f5ffd3cc962503b04cdf250e1ad3b6e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-03-11T14:14:53Z","title_canon_sha256":"6a730b2c53c1d87a6510cfd42ebbfe01ef3e133e8f667e742b707c99ead77c13"},"schema_version":"1.0","source":{"id":"0803.1594","kind":"arxiv","version":1}},"canonical_sha256":"cfc24bdd75b2af7de34515d4a8d8e825f19febdae56af01d086f1a687c15454d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cfc24bdd75b2af7de34515d4a8d8e825f19febdae56af01d086f1a687c15454d","first_computed_at":"2026-07-04T15:12:16.952218Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:12:16.952218Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"61zEBPn0p5ay8Xwy7PAU112CKPtmws6vG7D8MyWoSvOxawREw3Dc4dhB9iM/+YBqmu0k5P/xSFuCA+3M0QyqBg==","signature_status":"signed_v1","signed_at":"2026-07-04T15:12:16.952611Z","signed_message":"canonical_sha256_bytes"},"source_id":"0803.1594","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:205405e83bfcc667603c11a354e2a502f05b85c48eb18eb269f31c5f44d9ae92","sha256:6d1022094d2720ac488661b7d108a967bf1d14d2f402d2d4eaa4afd66dd0c616"],"state_sha256":"7711105c95965c8529cedcb738a712bc5fc8ff254b16a21db03e086d2672bdaa"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NSFdMLoc8Oe0E8smJx3MENGf4lw+tmPq0HpCFWyPkapd/XltztZRdIno3ziJH8sXIwKjvwak3yXMdiA2ilxuDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-05T03:34:56.208034Z","bundle_sha256":"330994ba9c7c0b9aa2bf6a86a2432e1afcb6632f41825239e5ad127acbeb2ac7"}}