{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:ZMJPURWP6M2NETRHHT5OIXH43R","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":"c96de525f075ab32823ac297e35eb48aeb6e8c850941374203d43b41a0fce190","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2016-06-27T17:25:20Z","title_canon_sha256":"574395d84dbb06642e7cc10da6cb5feb2c0bcac89f153b47b3c24bbfd2fe07f4"},"schema_version":"1.0","source":{"id":"1606.08375","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1606.08375","created_at":"2026-05-18T01:11:52Z"},{"alias_kind":"arxiv_version","alias_value":"1606.08375v1","created_at":"2026-05-18T01:11:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1606.08375","created_at":"2026-05-18T01:11:52Z"},{"alias_kind":"pith_short_12","alias_value":"ZMJPURWP6M2N","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_16","alias_value":"ZMJPURWP6M2NETRH","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_8","alias_value":"ZMJPURWP","created_at":"2026-05-18T12:30:53Z"}],"graph_snapshots":[{"event_id":"sha256:c83d17d370d08a47711e3e865c0f87ab8ba43cf5afb2deab43099ca0860c980f","target":"graph","created_at":"2026-05-18T01:11:52Z","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":"Quantum key distribution (QKD) and quantum communication enable the secure exchange of information between remote parties. Currently, the distributed-phase-reference (DPR) protocols, which are based on weak coherent pulses, are among the most practical solutions for long-range QKD. During the last 10 years, long-distance fiber-based DPR systems have been successfully demonstrated, although fundamental obstacles such as intrinsic channel losses limit their performance. Here, we introduce the first two-dimensional DPR-QKD protocol in which information is encoded in the time and phase of weak coh","authors_text":"Davide Bacco, Jesper Bjerge Christensen, Karsten Rottwitt, Leif Katsuo Oxenl{\\o}we, Mario A. Usuga Castaneda, S{\\o}ren Forchhammer, Yunhong Ding","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2016-06-27T17:25:20Z","title":"Two-dimensional distributed-phase-reference protocol for quantum key distribution"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1606.08375","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:c5c1a4f84e5e2ed74fa1ec3cb997d3b0436f9335a329a30804d2176c05f0c65a","target":"record","created_at":"2026-05-18T01:11:52Z","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":"c96de525f075ab32823ac297e35eb48aeb6e8c850941374203d43b41a0fce190","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2016-06-27T17:25:20Z","title_canon_sha256":"574395d84dbb06642e7cc10da6cb5feb2c0bcac89f153b47b3c24bbfd2fe07f4"},"schema_version":"1.0","source":{"id":"1606.08375","kind":"arxiv","version":1}},"canonical_sha256":"cb12fa46cff334d24e273cfae45cfcdc7cf23a08d8a26abe9875be7bb62a6130","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cb12fa46cff334d24e273cfae45cfcdc7cf23a08d8a26abe9875be7bb62a6130","first_computed_at":"2026-05-18T01:11:52.244930Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:11:52.244930Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"JUskpSW9k0L+ZCZnOUPEjibvtXhg6LD0nQAFsFgBxMIvf6Tdjr8cgB+9QIevE1Qvb0YNADOeQxx4aLiaWCj/BQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:11:52.245258Z","signed_message":"canonical_sha256_bytes"},"source_id":"1606.08375","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c5c1a4f84e5e2ed74fa1ec3cb997d3b0436f9335a329a30804d2176c05f0c65a","sha256:c83d17d370d08a47711e3e865c0f87ab8ba43cf5afb2deab43099ca0860c980f"],"state_sha256":"f5d301d840afa1db72949a7468fa3fca6664d119cad6bd864553016ffbcb3599"}