{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:VKNGVBZIX35VHWRUE5IK64ATIA","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":"1e4e32d0326b306f7215d4a46c3fc976484e069b607ce521ac897074ceaea9b9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2024-06-10T17:55:25Z","title_canon_sha256":"3814197d9b3bb6aaef886f9384246d49636969fde60889d2456f3afa0a252dfc"},"schema_version":"1.0","source":{"id":"2406.06515","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2406.06515","created_at":"2026-07-05T08:30:34Z"},{"alias_kind":"arxiv_version","alias_value":"2406.06515v2","created_at":"2026-07-05T08:30:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2406.06515","created_at":"2026-07-05T08:30:34Z"},{"alias_kind":"pith_short_12","alias_value":"VKNGVBZIX35V","created_at":"2026-07-05T08:30:34Z"},{"alias_kind":"pith_short_16","alias_value":"VKNGVBZIX35VHWRU","created_at":"2026-07-05T08:30:34Z"},{"alias_kind":"pith_short_8","alias_value":"VKNGVBZI","created_at":"2026-07-05T08:30:34Z"}],"graph_snapshots":[{"event_id":"sha256:b9d47bf2b32a18a491f43a1522820d2f7d3d76f7f316bcd81e45a6349584df8d","target":"graph","created_at":"2026-07-05T08:30:34Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2406.06515/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Long-distance quantum communication using quantum repeaters is an enabling technology for secure communication, distributed quantum computing and quantum-enhanced sensing and metrology. As a building block of quantum repeaters, spin-photon entanglement has been demonstrated with both atomic and solid-state qubits. However, previously demonstrated qubits with long spin coherence do not directly emit photons into the low-loss telecom band that is needed for long-distance communication. Here, we demonstrate spin-photon entanglement using a single Er$^{3+}$ ion in a solid-state crystal, integrated","authors_text":"Haitong Xu, Jeff D. Thompson, {\\L}ukasz Dusanowski, Mehmet T. Uysal, Nathalie P. de Leon, Robert J. Cava, Salim Ourari, Sebastian P. Horvath","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2024-06-10T17:55:25Z","title":"Spin-photon entanglement of a single Er$^{3+}$ ion in the telecom band"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2406.06515","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":"sha256:5c908d8e3db9d5e4201ccd2ad956972889e94919076238680b5f29aca0c41965","target":"record","created_at":"2026-07-05T08:30:34Z","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":"1e4e32d0326b306f7215d4a46c3fc976484e069b607ce521ac897074ceaea9b9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2024-06-10T17:55:25Z","title_canon_sha256":"3814197d9b3bb6aaef886f9384246d49636969fde60889d2456f3afa0a252dfc"},"schema_version":"1.0","source":{"id":"2406.06515","kind":"arxiv","version":2}},"canonical_sha256":"aa9a6a8728befb53da342750af70134010a8a921f1b53e6245ea632f5881b444","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"aa9a6a8728befb53da342750af70134010a8a921f1b53e6245ea632f5881b444","first_computed_at":"2026-07-05T08:30:34.572563Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T08:30:34.572563Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"jwwkfPF66yP9eNWUIoa7hIVMvulGwI7XXeBkczfENkwbvsRcHUcnzfnXMkYob3xxkXOuPjy5d+k2TUzaonpkCA==","signature_status":"signed_v1","signed_at":"2026-07-05T08:30:34.573098Z","signed_message":"canonical_sha256_bytes"},"source_id":"2406.06515","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5c908d8e3db9d5e4201ccd2ad956972889e94919076238680b5f29aca0c41965","sha256:b9d47bf2b32a18a491f43a1522820d2f7d3d76f7f316bcd81e45a6349584df8d"],"state_sha256":"8be1f2d2bfac7edcaf759887fd3f274853c361e684c1eec4a64c14f240cc2714"}