{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:FTPWNSVPCDFJVVPR4NQ4Y7PLT5","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":"88a3293825273ff5d762685648c95761af3a46e50d3ac007edbd08afac6d666f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-05-03T15:23:46Z","title_canon_sha256":"6b16b040fd1c1da1669712d12cb0382fab7277703cf282c174cf24b637f1dad8"},"schema_version":"1.0","source":{"id":"1805.01370","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.01370","created_at":"2026-05-18T00:06:39Z"},{"alias_kind":"arxiv_version","alias_value":"1805.01370v2","created_at":"2026-05-18T00:06:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.01370","created_at":"2026-05-18T00:06:39Z"},{"alias_kind":"pith_short_12","alias_value":"FTPWNSVPCDFJ","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_16","alias_value":"FTPWNSVPCDFJVVPR","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_8","alias_value":"FTPWNSVP","created_at":"2026-05-18T12:32:25Z"}],"graph_snapshots":[{"event_id":"sha256:c1dd9d892b75e8dd0d4389ffcab0151b694f90d569d9b942ec65cf0e5f55260a","target":"graph","created_at":"2026-05-18T00:06:39Z","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":"Quantum amplifier is an essential device in quantum information processing. As in the classical (non-quantum) case, its characteristic uncertainty needs to be suppressed by feedback, and in fact such a control theory for a single quantum amplifier has recently been developed. This letter extends this result to the case of cascaded quantum amplifier. In particular, we consider two types of structures: the case where controlled amplifiers are connected in series, and the case where a single feedback control is applied to the cascaded amplifier. Then, we prove that the latter is better in the sen","authors_text":"Naoki Yamamoto, Yu Yokotera","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-05-03T15:23:46Z","title":"Sensitivity Analysis of Cascaded Quantum Feedback Amplifier"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.01370","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":"sha256:4eb4f96bf7c1060966455becaf82e19fc53efdcf0d472cf89cfbf42b34fbe9d0","target":"record","created_at":"2026-05-18T00:06:39Z","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":"88a3293825273ff5d762685648c95761af3a46e50d3ac007edbd08afac6d666f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-05-03T15:23:46Z","title_canon_sha256":"6b16b040fd1c1da1669712d12cb0382fab7277703cf282c174cf24b637f1dad8"},"schema_version":"1.0","source":{"id":"1805.01370","kind":"arxiv","version":2}},"canonical_sha256":"2cdf66caaf10ca9ad5f1e361cc7deb9f7b1b1acc7c125fb0b28a31d4fe1d901d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2cdf66caaf10ca9ad5f1e361cc7deb9f7b1b1acc7c125fb0b28a31d4fe1d901d","first_computed_at":"2026-05-18T00:06:39.967438Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:06:39.967438Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"15C5LqNVqpfz/cdsRRHooPvt1ktw19Q43bONdMU4OoVr2s+bW4xrzyZk29J/gf6O24pjFvrpfoD6gZSNWzgTAg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:06:39.967870Z","signed_message":"canonical_sha256_bytes"},"source_id":"1805.01370","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4eb4f96bf7c1060966455becaf82e19fc53efdcf0d472cf89cfbf42b34fbe9d0","sha256:c1dd9d892b75e8dd0d4389ffcab0151b694f90d569d9b942ec65cf0e5f55260a"],"state_sha256":"164fbb8ab11f1a7e370ca72e15ffe38470f8c366e5b9d4e55279fb2e19017db3"}