{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:V4HYQW6IOUXHO2TVBG6VLUDLDR","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":"0da871732281d2be81629a127e258658bdbdf4588f5d2c8f09e75aa2f3e2e825","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2016-12-07T07:00:02Z","title_canon_sha256":"8fc51e31941dd4afa84d0e3cd732bfa75d465420e86fce8e4048b55d63da2ff1"},"schema_version":"1.0","source":{"id":"1612.02127","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1612.02127","created_at":"2026-05-18T00:55:35Z"},{"alias_kind":"arxiv_version","alias_value":"1612.02127v1","created_at":"2026-05-18T00:55:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1612.02127","created_at":"2026-05-18T00:55:35Z"},{"alias_kind":"pith_short_12","alias_value":"V4HYQW6IOUXH","created_at":"2026-05-18T12:30:46Z"},{"alias_kind":"pith_short_16","alias_value":"V4HYQW6IOUXHO2TV","created_at":"2026-05-18T12:30:46Z"},{"alias_kind":"pith_short_8","alias_value":"V4HYQW6I","created_at":"2026-05-18T12:30:46Z"}],"graph_snapshots":[{"event_id":"sha256:648c063c72a92dad968c600bca6e2ecf9bd1e225a480f548f9bf20865c6b8395","target":"graph","created_at":"2026-05-18T00:55:35Z","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 experimentally demonstrate that the bandwidth of single photons laser pulse is compressed by a factor of 58 in a periodically poled lithium niobate (PPLN) waveguide chip. A chirped single photons laser pulse and an oppositely chirped classical laser pulse are employed to produce a narrowband single photon pulse with new frequency through sum-frequency generation. In our experiment, the frequency and bandwidth of single photons at 1550 nm are simultaneously converted. Our results mark a critical step towards the realization of coherent photonic interface between quantum communication at 1550","authors_text":"Minghuang Sang, Tong Xiang, Xianfeng Chen, Yiyou Nie, Yuanhua Li","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2016-12-07T07:00:02Z","title":"Spectral compression of single-photon-level laser pulse"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1612.02127","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:d6742e0aa7aa08b95421d25eb5da8215c8a4ff1efd6fe4bb969230366be6a23a","target":"record","created_at":"2026-05-18T00:55:35Z","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":"0da871732281d2be81629a127e258658bdbdf4588f5d2c8f09e75aa2f3e2e825","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2016-12-07T07:00:02Z","title_canon_sha256":"8fc51e31941dd4afa84d0e3cd732bfa75d465420e86fce8e4048b55d63da2ff1"},"schema_version":"1.0","source":{"id":"1612.02127","kind":"arxiv","version":1}},"canonical_sha256":"af0f885bc8752e776a7509bd55d06b1c420daf6c5b10819c574b9ebf990f3015","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"af0f885bc8752e776a7509bd55d06b1c420daf6c5b10819c574b9ebf990f3015","first_computed_at":"2026-05-18T00:55:35.282023Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:55:35.282023Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"IEmKjM8CXWWyW0xTTUm05mEBN7OPrcnAFrsfAsyD2FyYG6m48schHmbG/MNTeRgUglcHpd+x6J9tXtTXlFdqBw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:55:35.282423Z","signed_message":"canonical_sha256_bytes"},"source_id":"1612.02127","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d6742e0aa7aa08b95421d25eb5da8215c8a4ff1efd6fe4bb969230366be6a23a","sha256:648c063c72a92dad968c600bca6e2ecf9bd1e225a480f548f9bf20865c6b8395"],"state_sha256":"e3422a4eacdae1ead0bb8060cdec2753ac1fa8125b544f5336c601ffd4c03ffa"}