{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:PXTH3R7FIX2JPSF6BOMMXRUJME","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":"fc8baef72c73cca81967e8ada354bc3e6b2cf1746fe17d5ce3094146deb629ab","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-05-20T13:11:10Z","title_canon_sha256":"286d0b64c0954705f4c07e0d6249f27097b95acce4cca48af2dd214b36633caa"},"schema_version":"1.0","source":{"id":"1905.08080","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1905.08080","created_at":"2026-05-17T23:45:47Z"},{"alias_kind":"arxiv_version","alias_value":"1905.08080v1","created_at":"2026-05-17T23:45:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1905.08080","created_at":"2026-05-17T23:45:47Z"},{"alias_kind":"pith_short_12","alias_value":"PXTH3R7FIX2J","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_16","alias_value":"PXTH3R7FIX2JPSF6","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_8","alias_value":"PXTH3R7F","created_at":"2026-05-18T12:33:24Z"}],"graph_snapshots":[{"event_id":"sha256:6528cba129a8ede3cd0810187a7ee28a1216e3833757057fd3280400af610c62","target":"graph","created_at":"2026-05-17T23:45:47Z","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":"Depolarization is one of the most important sources of error in a quantum communication link that can be introduced by the quantum channel. Even though standard quantum process tomography can, in theory, be applied to characterize this effect, in most real-world implementations depolarization cannot be distinguished from time-varying unitary transformations, especially when the time scales are much shorter than the detectors response time. In this paper, we introduce a method for distinguishing true depolarization from fast polarization rotations by employing Hong-Ou-Mandel interference. It is","authors_text":"Guilherme P. Tempor\\~ao, Gustavo C. Amaral","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-05-20T13:11:10Z","title":"Characterization of Depolarizing Channels Using Two-Photon Intereference"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1905.08080","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":"sha256:38ae943f6f8661738122b4fb0ba530127fbee4611f1d7527dcc8cd81b9b68000","target":"record","created_at":"2026-05-17T23:45:47Z","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":"fc8baef72c73cca81967e8ada354bc3e6b2cf1746fe17d5ce3094146deb629ab","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-05-20T13:11:10Z","title_canon_sha256":"286d0b64c0954705f4c07e0d6249f27097b95acce4cca48af2dd214b36633caa"},"schema_version":"1.0","source":{"id":"1905.08080","kind":"arxiv","version":1}},"canonical_sha256":"7de67dc7e545f497c8be0b98cbc6896111b5bea7c2567b2616807d523a2d42b0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7de67dc7e545f497c8be0b98cbc6896111b5bea7c2567b2616807d523a2d42b0","first_computed_at":"2026-05-17T23:45:47.663423Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:45:47.663423Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"6Den4ovcfP/DDTXaWS1KI6YrCS4W2LcDuTrV51nPJZQChOuhRURV3v5vpguEL7dokAAHfOjHsvm/oM5VP8erAQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:45:47.664086Z","signed_message":"canonical_sha256_bytes"},"source_id":"1905.08080","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:38ae943f6f8661738122b4fb0ba530127fbee4611f1d7527dcc8cd81b9b68000","sha256:6528cba129a8ede3cd0810187a7ee28a1216e3833757057fd3280400af610c62"],"state_sha256":"76e2a38d9ff78c6241a79b919d5f72458791ef8dbf4e1bd52436a893c8dc5eea"}