{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:HUHEE7WR4CVKQYNUIHX5TAXWIL","short_pith_number":"pith:HUHEE7WR","canonical_record":{"source":{"id":"1904.02486","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-04-04T11:15:55Z","cross_cats_sorted":[],"title_canon_sha256":"781ce0507d9e64e3e75f9476466ca4e2bbdcfb3e1202997388e17d7226a0c82d","abstract_canon_sha256":"aa11e7ec76493956af34de21b841ff7b418f36c3e9b65abf206023f480b226fd"},"schema_version":"1.0"},"canonical_sha256":"3d0e427ed1e0aaa861b441efd982f642d507b4a3a46ed17e9c89b68f358d451c","source":{"kind":"arxiv","id":"1904.02486","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.02486","created_at":"2026-05-17T23:44:06Z"},{"alias_kind":"arxiv_version","alias_value":"1904.02486v1","created_at":"2026-05-17T23:44:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.02486","created_at":"2026-05-17T23:44:06Z"},{"alias_kind":"pith_short_12","alias_value":"HUHEE7WR4CVK","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_16","alias_value":"HUHEE7WR4CVKQYNU","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_8","alias_value":"HUHEE7WR","created_at":"2026-05-18T12:33:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:HUHEE7WR4CVKQYNUIHX5TAXWIL","target":"record","payload":{"canonical_record":{"source":{"id":"1904.02486","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-04-04T11:15:55Z","cross_cats_sorted":[],"title_canon_sha256":"781ce0507d9e64e3e75f9476466ca4e2bbdcfb3e1202997388e17d7226a0c82d","abstract_canon_sha256":"aa11e7ec76493956af34de21b841ff7b418f36c3e9b65abf206023f480b226fd"},"schema_version":"1.0"},"canonical_sha256":"3d0e427ed1e0aaa861b441efd982f642d507b4a3a46ed17e9c89b68f358d451c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:44:06.950446Z","signature_b64":"dVdxmL37n5cFYP0OxTUB/ofXlM3RoLY8JZGA8hMHG/VEkb0odkmwH9x34qZivQgua/kPMAayfzQpkhe+CrINCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3d0e427ed1e0aaa861b441efd982f642d507b4a3a46ed17e9c89b68f358d451c","last_reissued_at":"2026-05-17T23:44:06.949878Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:44:06.949878Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1904.02486","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":"2026-05-17T23:44:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QEjBGHzclQIc7gLFU+N2WTvpUXAvxxw9CynFwiEZHOjjkgt/lV/K+7QD+3htrHOuQ1yu6Z5lTpmOKDTqDnWuAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-21T21:06:03.640618Z"},"content_sha256":"b40508584057937611fa098d1556baf719669f9d250f43a6763d997f4e39b5d2","schema_version":"1.0","event_id":"sha256:b40508584057937611fa098d1556baf719669f9d250f43a6763d997f4e39b5d2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:HUHEE7WR4CVKQYNUIHX5TAXWIL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Modulator-Free Quantum Key Distribution Transmitter Chip","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Andrew J. Shields, Davide G. Marangon, Innocenzo De Marco, James F. Dynes, Marco Lucamarini, Taofiq K. Para\\\"iso, Thomas Roger, Zhiliang Yuan","submitted_at":"2019-04-04T11:15:55Z","abstract_excerpt":"Quantum key distribution (QKD) has convincingly been proven compatible with real life applications. Its wide-scale deployment in optical networks will benefit from an optical platform that allows miniature devices capable of encoding the necessarily complex signals at high rates and with low power consumption. While photonic integration is the ideal route toward miniaturisation, an efficient route to high-speed encoding of the quantum phase states on chip is still missing. Consequently, current devices rely on bulky and high power demanding phase modulation elements which hinder the sought-aft"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.02486","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":"2026-05-17T23:44:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yBc0U6ziT2aKTW35AXzjot3a/6nV8niShIY2KBrJKomRqeORMRToZ7PpahsF0Rb/WarVvQh/Ykmq9/+e3SMLAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-21T21:06:03.640967Z"},"content_sha256":"020d95bf85ccd876af69258424b04ecbecf786a31504cc54ac2419de0edf0c16","schema_version":"1.0","event_id":"sha256:020d95bf85ccd876af69258424b04ecbecf786a31504cc54ac2419de0edf0c16"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HUHEE7WR4CVKQYNUIHX5TAXWIL/bundle.json","state_url":"https://pith.science/pith/HUHEE7WR4CVKQYNUIHX5TAXWIL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HUHEE7WR4CVKQYNUIHX5TAXWIL/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":"2026-06-21T21:06:03Z","links":{"resolver":"https://pith.science/pith/HUHEE7WR4CVKQYNUIHX5TAXWIL","bundle":"https://pith.science/pith/HUHEE7WR4CVKQYNUIHX5TAXWIL/bundle.json","state":"https://pith.science/pith/HUHEE7WR4CVKQYNUIHX5TAXWIL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HUHEE7WR4CVKQYNUIHX5TAXWIL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:HUHEE7WR4CVKQYNUIHX5TAXWIL","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":"aa11e7ec76493956af34de21b841ff7b418f36c3e9b65abf206023f480b226fd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-04-04T11:15:55Z","title_canon_sha256":"781ce0507d9e64e3e75f9476466ca4e2bbdcfb3e1202997388e17d7226a0c82d"},"schema_version":"1.0","source":{"id":"1904.02486","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.02486","created_at":"2026-05-17T23:44:06Z"},{"alias_kind":"arxiv_version","alias_value":"1904.02486v1","created_at":"2026-05-17T23:44:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.02486","created_at":"2026-05-17T23:44:06Z"},{"alias_kind":"pith_short_12","alias_value":"HUHEE7WR4CVK","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_16","alias_value":"HUHEE7WR4CVKQYNU","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_8","alias_value":"HUHEE7WR","created_at":"2026-05-18T12:33:18Z"}],"graph_snapshots":[{"event_id":"sha256:020d95bf85ccd876af69258424b04ecbecf786a31504cc54ac2419de0edf0c16","target":"graph","created_at":"2026-05-17T23:44:06Z","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) has convincingly been proven compatible with real life applications. Its wide-scale deployment in optical networks will benefit from an optical platform that allows miniature devices capable of encoding the necessarily complex signals at high rates and with low power consumption. While photonic integration is the ideal route toward miniaturisation, an efficient route to high-speed encoding of the quantum phase states on chip is still missing. Consequently, current devices rely on bulky and high power demanding phase modulation elements which hinder the sought-aft","authors_text":"Andrew J. Shields, Davide G. Marangon, Innocenzo De Marco, James F. Dynes, Marco Lucamarini, Taofiq K. Para\\\"iso, Thomas Roger, Zhiliang Yuan","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-04-04T11:15:55Z","title":"A Modulator-Free Quantum Key Distribution Transmitter Chip"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.02486","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:b40508584057937611fa098d1556baf719669f9d250f43a6763d997f4e39b5d2","target":"record","created_at":"2026-05-17T23:44:06Z","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":"aa11e7ec76493956af34de21b841ff7b418f36c3e9b65abf206023f480b226fd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-04-04T11:15:55Z","title_canon_sha256":"781ce0507d9e64e3e75f9476466ca4e2bbdcfb3e1202997388e17d7226a0c82d"},"schema_version":"1.0","source":{"id":"1904.02486","kind":"arxiv","version":1}},"canonical_sha256":"3d0e427ed1e0aaa861b441efd982f642d507b4a3a46ed17e9c89b68f358d451c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3d0e427ed1e0aaa861b441efd982f642d507b4a3a46ed17e9c89b68f358d451c","first_computed_at":"2026-05-17T23:44:06.949878Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:44:06.949878Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"dVdxmL37n5cFYP0OxTUB/ofXlM3RoLY8JZGA8hMHG/VEkb0odkmwH9x34qZivQgua/kPMAayfzQpkhe+CrINCQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:44:06.950446Z","signed_message":"canonical_sha256_bytes"},"source_id":"1904.02486","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b40508584057937611fa098d1556baf719669f9d250f43a6763d997f4e39b5d2","sha256:020d95bf85ccd876af69258424b04ecbecf786a31504cc54ac2419de0edf0c16"],"state_sha256":"5200fe1e15122ec9fe79eb8a1999196618d69c708042273d54d2ea57083df8ea"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HqnTWkKCh9DitC7nTpyMsOPcKNrqK1Hh3ECfvuvkkVhu0r8M457BbZWrvUx1wxLPowsT44XCOgYcigTpzBXdBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-21T21:06:03.642958Z","bundle_sha256":"5aa06360416a74717e5b59fb723fc388167ea278f7f4350b1dab1d1f3aef8980"}}