{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:PPUSBAVGLNXRLOIQ7ZIL4PEOMJ","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":"a8f9ba0865dd9ca051bce09700c3926ecde44b67f970e3f9f2eba923a4a3ab62","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-02-22T09:11:06Z","title_canon_sha256":"be076b7e268cdf8212c4365206e71f09a76596edf8a66c3a029a4a48f9e190e8"},"schema_version":"1.0","source":{"id":"1802.07947","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.07947","created_at":"2026-05-18T00:03:24Z"},{"alias_kind":"arxiv_version","alias_value":"1802.07947v2","created_at":"2026-05-18T00:03:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.07947","created_at":"2026-05-18T00:03:24Z"},{"alias_kind":"pith_short_12","alias_value":"PPUSBAVGLNXR","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_16","alias_value":"PPUSBAVGLNXRLOIQ","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_8","alias_value":"PPUSBAVG","created_at":"2026-05-18T12:32:46Z"}],"graph_snapshots":[{"event_id":"sha256:513263a04b162ec2880b103a6d106b8e15e57f3e83ace1ce650d5e5e706f0025","target":"graph","created_at":"2026-05-18T00:03:24Z","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 report a single-stage bi-directional interface capable of linking Sr+ trapped ion qubits in a long-distance quantum network. Our interface converts photons between the Sr+ emission wavelength at 422 nm and the telecoms C-band to enable low-loss transmission over optical fiber. We have achieved both up- and down-conversion at the single photon level with efficiencies of 9.4% and 1.1% respectively. Furthermore we demonstrate noise levels that are low enough to allow for genuine quantum operation in the future.","authors_text":"Benjamin Brecht, Corin B.E. Gawith, Ian A. Walmsley, Jonas N. Becker, Joshua Nunn, Patrick M. Ledingham, Peter G.R. Smith, Peter J. Mosley, Robert J.A. Francis-Jones, Thomas A. Wright","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-02-22T09:11:06Z","title":"A two-way photonic interface for linking Sr+ transition at 422 nm to the telecommunications C-band"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.07947","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":"sha256:3b271c26f9e900fb1bb6a211436a6793b6aa7d122eda12a40b9af805899631da","target":"record","created_at":"2026-05-18T00:03:24Z","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":"a8f9ba0865dd9ca051bce09700c3926ecde44b67f970e3f9f2eba923a4a3ab62","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-02-22T09:11:06Z","title_canon_sha256":"be076b7e268cdf8212c4365206e71f09a76596edf8a66c3a029a4a48f9e190e8"},"schema_version":"1.0","source":{"id":"1802.07947","kind":"arxiv","version":2}},"canonical_sha256":"7be92082a65b6f15b910fe50be3c8e6240969b3e2abd370f89672fee85e61911","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7be92082a65b6f15b910fe50be3c8e6240969b3e2abd370f89672fee85e61911","first_computed_at":"2026-05-18T00:03:24.669615Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:03:24.669615Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"3cFMzoo3yLdVrpkOocgCZJQylB56kvha+d7tX55z/fZRXqsi27HMuA55iakvceWHG7NPQWyw4aMwrFo8wrttAA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:03:24.670174Z","signed_message":"canonical_sha256_bytes"},"source_id":"1802.07947","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3b271c26f9e900fb1bb6a211436a6793b6aa7d122eda12a40b9af805899631da","sha256:513263a04b162ec2880b103a6d106b8e15e57f3e83ace1ce650d5e5e706f0025"],"state_sha256":"7959f4b93f95a680c5049d077d00b5e35a5234392fde6280d122974eca8f2e0a"}