{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2017:TR7FZXWTI7JSVEXZYKPCS35ZN5","short_pith_number":"pith:TR7FZXWT","schema_version":"1.0","canonical_sha256":"9c7e5cded347d32a92f9c29e296fb96f7b629bec342405b804f36c7fe205c4e7","source":{"kind":"arxiv","id":"1703.03466","version":2},"attestation_state":"computed","paper":{"title":"Secret Loss of Unitarity due to the Classical Background","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["quant-ph"],"primary_cat":"hep-th","authors_text":"I-Sheng Yang","submitted_at":"2017-03-09T21:19:27Z","abstract_excerpt":"We show that a quantum subsystem can become significantly entangled with a classical background through a process with little or none semi-classical back-reactions. We study two quantum harmonic oscillators coupled to each other in a time-independent Hamiltonian. We compare it to its semi-classical approximation in which one of the oscillators is treated as the classical background. In this approximation, the remaining quantum oscillator has an effective Hamiltonian which is time-dependent, and its evolution appears to be unitary. However, in the fully quantum model, the two oscillators can en"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1703.03466","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2017-03-09T21:19:27Z","cross_cats_sorted":["quant-ph"],"title_canon_sha256":"d5728109fac3de79ff1dc1e78f23f91e7bf5fc1c05833d892b35fa71521de05f","abstract_canon_sha256":"ac859b0bafb733572fc802c2997deffc4d3b9a88f98715a30cc72c855e4affd7"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:40:06.912826Z","signature_b64":"/a9eNv0lkQrN2uxvC513gIFqx5roSCHS5Vvmbg+74qk1x6US1eQkUyHyk08QiE3LBrlmvciM8i5aNIkP3VQ9Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9c7e5cded347d32a92f9c29e296fb96f7b629bec342405b804f36c7fe205c4e7","last_reissued_at":"2026-05-18T00:40:06.912213Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:40:06.912213Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Secret Loss of Unitarity due to the Classical Background","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["quant-ph"],"primary_cat":"hep-th","authors_text":"I-Sheng Yang","submitted_at":"2017-03-09T21:19:27Z","abstract_excerpt":"We show that a quantum subsystem can become significantly entangled with a classical background through a process with little or none semi-classical back-reactions. We study two quantum harmonic oscillators coupled to each other in a time-independent Hamiltonian. We compare it to its semi-classical approximation in which one of the oscillators is treated as the classical background. In this approximation, the remaining quantum oscillator has an effective Hamiltonian which is time-dependent, and its evolution appears to be unitary. However, in the fully quantum model, the two oscillators can en"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1703.03466","kind":"arxiv","version":2},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1703.03466","created_at":"2026-05-18T00:40:06.912290+00:00"},{"alias_kind":"arxiv_version","alias_value":"1703.03466v2","created_at":"2026-05-18T00:40:06.912290+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1703.03466","created_at":"2026-05-18T00:40:06.912290+00:00"},{"alias_kind":"pith_short_12","alias_value":"TR7FZXWTI7JS","created_at":"2026-05-18T12:31:46.661854+00:00"},{"alias_kind":"pith_short_16","alias_value":"TR7FZXWTI7JSVEXZ","created_at":"2026-05-18T12:31:46.661854+00:00"},{"alias_kind":"pith_short_8","alias_value":"TR7FZXWT","created_at":"2026-05-18T12:31:46.661854+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/TR7FZXWTI7JSVEXZYKPCS35ZN5","json":"https://pith.science/pith/TR7FZXWTI7JSVEXZYKPCS35ZN5.json","graph_json":"https://pith.science/api/pith-number/TR7FZXWTI7JSVEXZYKPCS35ZN5/graph.json","events_json":"https://pith.science/api/pith-number/TR7FZXWTI7JSVEXZYKPCS35ZN5/events.json","paper":"https://pith.science/paper/TR7FZXWT"},"agent_actions":{"view_html":"https://pith.science/pith/TR7FZXWTI7JSVEXZYKPCS35ZN5","download_json":"https://pith.science/pith/TR7FZXWTI7JSVEXZYKPCS35ZN5.json","view_paper":"https://pith.science/paper/TR7FZXWT","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1703.03466&json=true","fetch_graph":"https://pith.science/api/pith-number/TR7FZXWTI7JSVEXZYKPCS35ZN5/graph.json","fetch_events":"https://pith.science/api/pith-number/TR7FZXWTI7JSVEXZYKPCS35ZN5/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/TR7FZXWTI7JSVEXZYKPCS35ZN5/action/timestamp_anchor","attest_storage":"https://pith.science/pith/TR7FZXWTI7JSVEXZYKPCS35ZN5/action/storage_attestation","attest_author":"https://pith.science/pith/TR7FZXWTI7JSVEXZYKPCS35ZN5/action/author_attestation","sign_citation":"https://pith.science/pith/TR7FZXWTI7JSVEXZYKPCS35ZN5/action/citation_signature","submit_replication":"https://pith.science/pith/TR7FZXWTI7JSVEXZYKPCS35ZN5/action/replication_record"}},"created_at":"2026-05-18T00:40:06.912290+00:00","updated_at":"2026-05-18T00:40:06.912290+00:00"}