{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:ERSH3QV26YDGIGSXNOYU67YSGT","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":"24507f8d86719c02a14318321649bdcb711556ec1abc3137b87eda09fc6b7789","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-12-12T07:26:27Z","title_canon_sha256":"27213e4304385da91f50bc7a9fcf3f52ba870694b028f8d4591171198f9a806a"},"schema_version":"1.0","source":{"id":"0912.2402","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0912.2402","created_at":"2026-05-18T02:10:24Z"},{"alias_kind":"arxiv_version","alias_value":"0912.2402v2","created_at":"2026-05-18T02:10:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0912.2402","created_at":"2026-05-18T02:10:24Z"},{"alias_kind":"pith_short_12","alias_value":"ERSH3QV26YDG","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"ERSH3QV26YDGIGSX","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"ERSH3QV2","created_at":"2026-05-18T12:25:59Z"}],"graph_snapshots":[{"event_id":"sha256:3937a87d5a867248eadcc1ae455f0284cba3ce0a774fa93e10fd3eb868466f5d","target":"graph","created_at":"2026-05-18T02:10:24Z","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 present a proposal for entanglement purification of the continuous-variable quantum state of two propagating optical fields. The scheme is based on letting each field interact with a local node, an atomic ensemble, whose internal collective excitation plays the role of an ancillary continuous variable resource. Entanglement purification is achieved by a dichotomic measurement, representing the required non-Gaussian element, and which consists in detecting the presence or absence of collective excitations in the atomic ensemble. This scheme can be extended to networks, where the nodes are si","authors_text":"David Vitali, Giovanna Morigi, Stefano Mancini, Stojan Rebic","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-12-12T07:26:27Z","title":"Continuous-variables entanglement purification with atomic systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0912.2402","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":"sha256:74f85bfadb9993647c5f6e5e8a923c037461f22d93521b2517fb861d331f3bd8","target":"record","created_at":"2026-05-18T02:10:24Z","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":"24507f8d86719c02a14318321649bdcb711556ec1abc3137b87eda09fc6b7789","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-12-12T07:26:27Z","title_canon_sha256":"27213e4304385da91f50bc7a9fcf3f52ba870694b028f8d4591171198f9a806a"},"schema_version":"1.0","source":{"id":"0912.2402","kind":"arxiv","version":2}},"canonical_sha256":"24647dc2baf606641a576bb14f7f1234ec4c7e42a1065350102238a847190373","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"24647dc2baf606641a576bb14f7f1234ec4c7e42a1065350102238a847190373","first_computed_at":"2026-05-18T02:10:24.245618Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:10:24.245618Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"agQT/n0RQ6SLhN8oeyE3Gfa7KGQCg1MkPVRNMSeGpkCQSixSJylxPBDR6YkkJ7v7QIusDrgH/1QDtAYrqoGqCw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:10:24.246268Z","signed_message":"canonical_sha256_bytes"},"source_id":"0912.2402","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:74f85bfadb9993647c5f6e5e8a923c037461f22d93521b2517fb861d331f3bd8","sha256:3937a87d5a867248eadcc1ae455f0284cba3ce0a774fa93e10fd3eb868466f5d"],"state_sha256":"241f703c2013ebb5a5075d2d3444608aa95466f2c59bafb3a187a9d65d040e02"}