{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:BMPATSDB5NWVS5LTQDWG47DNUZ","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":"9d31b08e9a610b324cb798cce745afacb13d3aa5988fe9d3e0a00dec963025ac","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2017-07-14T09:12:16Z","title_canon_sha256":"72e9d5d7797f56876101411903c65e3aa832edb9f213c5e24914a88a60ccfb0e"},"schema_version":"1.0","source":{"id":"1707.04425","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1707.04425","created_at":"2026-05-18T00:40:02Z"},{"alias_kind":"arxiv_version","alias_value":"1707.04425v2","created_at":"2026-05-18T00:40:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1707.04425","created_at":"2026-05-18T00:40:02Z"},{"alias_kind":"pith_short_12","alias_value":"BMPATSDB5NWV","created_at":"2026-05-18T12:31:08Z"},{"alias_kind":"pith_short_16","alias_value":"BMPATSDB5NWVS5LT","created_at":"2026-05-18T12:31:08Z"},{"alias_kind":"pith_short_8","alias_value":"BMPATSDB","created_at":"2026-05-18T12:31:08Z"}],"graph_snapshots":[{"event_id":"sha256:a1554491080d9dec72efc49c0882121a7faa1bbfa8d12723f1afef1c00892832","target":"graph","created_at":"2026-05-18T00:40:02Z","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":"Time-bin encoding is an attractive method for transmitting photonic qubits over long distances with minimal decoherence. It allows a simple receiver for quantum key distribution (QKD) that extracts a key by measuring time of arrival of photons and detects eavesdropping by measuring interference of pulses in different time bins. In the past, coherent pulses have been generated using a CW laser and an intensity modulator. A greatly simplified transmitter is proposed and demonstrated here that works by directly modulating the laser diode. Coherence between pulses is maintained by a weak seed lase","authors_text":"Andrew J. Shields, George L. Roberts, James F. Dynes, Marco Lucamarini, Seb J. Savory, Zhiliang Yuan","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2017-07-14T09:12:16Z","title":"Modulator-free coherent-one-way quantum key distribution"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1707.04425","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:e874438ea1b7bb92452e6ea44134633ef333e5de5e7406335919d770e579ce74","target":"record","created_at":"2026-05-18T00:40:02Z","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":"9d31b08e9a610b324cb798cce745afacb13d3aa5988fe9d3e0a00dec963025ac","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2017-07-14T09:12:16Z","title_canon_sha256":"72e9d5d7797f56876101411903c65e3aa832edb9f213c5e24914a88a60ccfb0e"},"schema_version":"1.0","source":{"id":"1707.04425","kind":"arxiv","version":2}},"canonical_sha256":"0b1e09c861eb6d59757380ec6e7c6da647846af88b532a2d68ae07c9cfe2c8e8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0b1e09c861eb6d59757380ec6e7c6da647846af88b532a2d68ae07c9cfe2c8e8","first_computed_at":"2026-05-18T00:40:02.748053Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:40:02.748053Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"H5Ho0KP+I0J8Vx9VHxGkC0egwO84FGQyxP/+DhIK9NR7VTED7SdJCN+Pn/mqQbLVqxo5HjxmkaAH1/K3N9jnAw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:40:02.748766Z","signed_message":"canonical_sha256_bytes"},"source_id":"1707.04425","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e874438ea1b7bb92452e6ea44134633ef333e5de5e7406335919d770e579ce74","sha256:a1554491080d9dec72efc49c0882121a7faa1bbfa8d12723f1afef1c00892832"],"state_sha256":"832029bb8ec866bfc847e8346f450fca82fc86ceaf7f42b984655f26450d5c87"}