{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:ZYYV2SNDPFECYGA2CZKPXODUFB","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":"f498db0cc6dbe1edcd2506d62ad9551ef05f6ca1a25a296a944dcdb0d8f8f005","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-04-24T19:12:38Z","title_canon_sha256":"62e656487739ef3f0df9e912358cfc8b05fb978365cb97b29ed4449599b5bfa2"},"schema_version":"1.0","source":{"id":"2004.11945","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2004.11945","created_at":"2026-07-05T01:41:53Z"},{"alias_kind":"arxiv_version","alias_value":"2004.11945v2","created_at":"2026-07-05T01:41:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2004.11945","created_at":"2026-07-05T01:41:53Z"},{"alias_kind":"pith_short_12","alias_value":"ZYYV2SNDPFEC","created_at":"2026-07-05T01:41:53Z"},{"alias_kind":"pith_short_16","alias_value":"ZYYV2SNDPFECYGA2","created_at":"2026-07-05T01:41:53Z"},{"alias_kind":"pith_short_8","alias_value":"ZYYV2SND","created_at":"2026-07-05T01:41:53Z"}],"graph_snapshots":[{"event_id":"sha256:4ea2b256d8236f1679cc728267b15394674fd9d87452b1b5dd14650a5758e01a","target":"graph","created_at":"2026-07-05T01:41:53Z","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/2004.11945/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We investigate nonlinear effects on the dynamics of entanglement and other quantum observables in a system of two harmonic modes coupled through angular momentum. The nonlinearity arises from a quartic anharmonic term in each mode. The emergence and evolution of entanglement, non-gaussianity, photon number, photon antibunching and squeezing are examined for different initial product coherent states and couplings, through exact diagonalization in a truncated basis. It is shown that the anharmonic terms, even if weak, can lead to very significant effects for such initial states, considerably enh","authors_text":"Javier Garcia, Kartick Chandra Saha, N. Canosa, R. Rossignoli, Swapan Mandal","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-04-24T19:12:38Z","title":"Nonlinear effects on the dynamics of quantum harmonic modes coupled through angular momentum"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2004.11945","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:c7737b62f05bc50c1c999ea49567bbf1d586247415354ad0162d83aa37155e55","target":"record","created_at":"2026-07-05T01:41:53Z","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":"f498db0cc6dbe1edcd2506d62ad9551ef05f6ca1a25a296a944dcdb0d8f8f005","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-04-24T19:12:38Z","title_canon_sha256":"62e656487739ef3f0df9e912358cfc8b05fb978365cb97b29ed4449599b5bfa2"},"schema_version":"1.0","source":{"id":"2004.11945","kind":"arxiv","version":2}},"canonical_sha256":"ce315d49a379482c181a1654fbb8742860b6aa027fb5cc9192aaaac79ed0bd12","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ce315d49a379482c181a1654fbb8742860b6aa027fb5cc9192aaaac79ed0bd12","first_computed_at":"2026-07-05T01:41:53.178215Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:41:53.178215Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"lOIGldIPKPk7KTmhWvL0QAtoL6GhMS77AMZk/vfsGLLOzsceYrfxkcnyUfrFE1HcK8fGx0uPU1jtKAPn5zwMAw==","signature_status":"signed_v1","signed_at":"2026-07-05T01:41:53.178692Z","signed_message":"canonical_sha256_bytes"},"source_id":"2004.11945","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c7737b62f05bc50c1c999ea49567bbf1d586247415354ad0162d83aa37155e55","sha256:4ea2b256d8236f1679cc728267b15394674fd9d87452b1b5dd14650a5758e01a"],"state_sha256":"8551290935a0f44847e560921cc051e32b87a8874b99df5a7d6b34c1ba099285"}