{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:NHYPNHN5RNTJGLOG66GFYS4X2Z","short_pith_number":"pith:NHYPNHN5","canonical_record":{"source":{"id":"1111.4557","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-11-19T14:00:28Z","cross_cats_sorted":[],"title_canon_sha256":"bf5dd28c128566e372b7961becd0e437e48f4f191da1043ae948599386284b36","abstract_canon_sha256":"6e346482d6de5d9f331e2660e60e435c1d5aff2dc4b96457bdb656bcae885568"},"schema_version":"1.0"},"canonical_sha256":"69f0f69dbd8b66932dc6f78c5c4b97d667ce80733171b26fa68e7dd66e085504","source":{"kind":"arxiv","id":"1111.4557","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1111.4557","created_at":"2026-05-18T04:08:03Z"},{"alias_kind":"arxiv_version","alias_value":"1111.4557v1","created_at":"2026-05-18T04:08:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1111.4557","created_at":"2026-05-18T04:08:03Z"},{"alias_kind":"pith_short_12","alias_value":"NHYPNHN5RNTJ","created_at":"2026-05-18T12:26:37Z"},{"alias_kind":"pith_short_16","alias_value":"NHYPNHN5RNTJGLOG","created_at":"2026-05-18T12:26:37Z"},{"alias_kind":"pith_short_8","alias_value":"NHYPNHN5","created_at":"2026-05-18T12:26:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:NHYPNHN5RNTJGLOG66GFYS4X2Z","target":"record","payload":{"canonical_record":{"source":{"id":"1111.4557","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-11-19T14:00:28Z","cross_cats_sorted":[],"title_canon_sha256":"bf5dd28c128566e372b7961becd0e437e48f4f191da1043ae948599386284b36","abstract_canon_sha256":"6e346482d6de5d9f331e2660e60e435c1d5aff2dc4b96457bdb656bcae885568"},"schema_version":"1.0"},"canonical_sha256":"69f0f69dbd8b66932dc6f78c5c4b97d667ce80733171b26fa68e7dd66e085504","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:08:03.107207Z","signature_b64":"WfXMce7ZGqGC+baLjczmW3hiNrvwffuXecRLMrVjiV4l5UI2yZQjF+YZ5TmScgxpVAUuk3RfSeaxLOCGZ7K1Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"69f0f69dbd8b66932dc6f78c5c4b97d667ce80733171b26fa68e7dd66e085504","last_reissued_at":"2026-05-18T04:08:03.106731Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:08:03.106731Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1111.4557","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":"2026-05-18T04:08:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rLIk5sb9F+TsnbjdaySa7vvWk/CvPr+XAd1eByepUVF2gtd6Y2U7ASLXlJGEUJmGl/m4jrk0h+tp9AliWjA4Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T15:26:22.730950Z"},"content_sha256":"260790970a3488844354801297c006028b030201dc3e86ad2e99bff9cb16f62c","schema_version":"1.0","event_id":"sha256:260790970a3488844354801297c006028b030201dc3e86ad2e99bff9cb16f62c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:NHYPNHN5RNTJGLOG66GFYS4X2Z","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Entanglement Concentration with Quantum Non Demolition Hamiltonians","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Natalia Korolkova, Richard Tatham","submitted_at":"2011-11-19T14:00:28Z","abstract_excerpt":"We devise and examine two procrustean entanglement concentration schemes using Quantum Non- Demolition (QND) interaction Hamiltonians in the continuous variable regime, applicable for light, for atomic ensembles or in a hybrid setting. We thus expand the standard entanglement distillation toolbox to the use of a much more general, versatile and experimentally feasible interaction class. The first protocol uses Gaussian ancillary modes and a non-Gaussian post-measurement, the second a non-Gaussian ancillary mode and a Gaussian post-measurement. We explicitly calculate the density matrix element"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1111.4557","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":"2026-05-18T04:08:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7Cdm0MBK7k1+o04RDUyz+j7qSXqTzE/8H0L+ISQ/gHd9qLW1/Klnc6RWxBnUk8SfLfaJaVTlWonvDl+iUwg9Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T15:26:22.731365Z"},"content_sha256":"1a07ae62ce3240fdc4002dc7dbb0f6995a72e3148ddd079c3b60d2f19a9a4dc4","schema_version":"1.0","event_id":"sha256:1a07ae62ce3240fdc4002dc7dbb0f6995a72e3148ddd079c3b60d2f19a9a4dc4"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NHYPNHN5RNTJGLOG66GFYS4X2Z/bundle.json","state_url":"https://pith.science/pith/NHYPNHN5RNTJGLOG66GFYS4X2Z/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NHYPNHN5RNTJGLOG66GFYS4X2Z/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":"2026-05-31T15:26:22Z","links":{"resolver":"https://pith.science/pith/NHYPNHN5RNTJGLOG66GFYS4X2Z","bundle":"https://pith.science/pith/NHYPNHN5RNTJGLOG66GFYS4X2Z/bundle.json","state":"https://pith.science/pith/NHYPNHN5RNTJGLOG66GFYS4X2Z/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NHYPNHN5RNTJGLOG66GFYS4X2Z/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:NHYPNHN5RNTJGLOG66GFYS4X2Z","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":"6e346482d6de5d9f331e2660e60e435c1d5aff2dc4b96457bdb656bcae885568","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-11-19T14:00:28Z","title_canon_sha256":"bf5dd28c128566e372b7961becd0e437e48f4f191da1043ae948599386284b36"},"schema_version":"1.0","source":{"id":"1111.4557","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1111.4557","created_at":"2026-05-18T04:08:03Z"},{"alias_kind":"arxiv_version","alias_value":"1111.4557v1","created_at":"2026-05-18T04:08:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1111.4557","created_at":"2026-05-18T04:08:03Z"},{"alias_kind":"pith_short_12","alias_value":"NHYPNHN5RNTJ","created_at":"2026-05-18T12:26:37Z"},{"alias_kind":"pith_short_16","alias_value":"NHYPNHN5RNTJGLOG","created_at":"2026-05-18T12:26:37Z"},{"alias_kind":"pith_short_8","alias_value":"NHYPNHN5","created_at":"2026-05-18T12:26:37Z"}],"graph_snapshots":[{"event_id":"sha256:1a07ae62ce3240fdc4002dc7dbb0f6995a72e3148ddd079c3b60d2f19a9a4dc4","target":"graph","created_at":"2026-05-18T04:08:03Z","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 devise and examine two procrustean entanglement concentration schemes using Quantum Non- Demolition (QND) interaction Hamiltonians in the continuous variable regime, applicable for light, for atomic ensembles or in a hybrid setting. We thus expand the standard entanglement distillation toolbox to the use of a much more general, versatile and experimentally feasible interaction class. The first protocol uses Gaussian ancillary modes and a non-Gaussian post-measurement, the second a non-Gaussian ancillary mode and a Gaussian post-measurement. We explicitly calculate the density matrix element","authors_text":"Natalia Korolkova, Richard Tatham","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-11-19T14:00:28Z","title":"Entanglement Concentration with Quantum Non Demolition Hamiltonians"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1111.4557","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":"sha256:260790970a3488844354801297c006028b030201dc3e86ad2e99bff9cb16f62c","target":"record","created_at":"2026-05-18T04:08:03Z","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":"6e346482d6de5d9f331e2660e60e435c1d5aff2dc4b96457bdb656bcae885568","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-11-19T14:00:28Z","title_canon_sha256":"bf5dd28c128566e372b7961becd0e437e48f4f191da1043ae948599386284b36"},"schema_version":"1.0","source":{"id":"1111.4557","kind":"arxiv","version":1}},"canonical_sha256":"69f0f69dbd8b66932dc6f78c5c4b97d667ce80733171b26fa68e7dd66e085504","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"69f0f69dbd8b66932dc6f78c5c4b97d667ce80733171b26fa68e7dd66e085504","first_computed_at":"2026-05-18T04:08:03.106731Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:08:03.106731Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"WfXMce7ZGqGC+baLjczmW3hiNrvwffuXecRLMrVjiV4l5UI2yZQjF+YZ5TmScgxpVAUuk3RfSeaxLOCGZ7K1Aw==","signature_status":"signed_v1","signed_at":"2026-05-18T04:08:03.107207Z","signed_message":"canonical_sha256_bytes"},"source_id":"1111.4557","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:260790970a3488844354801297c006028b030201dc3e86ad2e99bff9cb16f62c","sha256:1a07ae62ce3240fdc4002dc7dbb0f6995a72e3148ddd079c3b60d2f19a9a4dc4"],"state_sha256":"6d80e52ca7b3170ca09adc0ad8c633b896e025991f62476db5c23ee5407e89d7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kdR+L4W5cbaCns25LqS+qN1jSeLHABthopDj95HR1Cx17BLnDxXdH6Ql6SYrvQyUa9p8ehuHNO+A8vw+pyr8DQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T15:26:22.735046Z","bundle_sha256":"6a6841548ba44b6893e9b4d5df9e85ec010a5117b3351a7e13336f7104f02ef0"}}