{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:E2OK5EFA3FIGQQZNDYFUVFKAWA","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":"9ad64595b1aa713af2842a2adb450c2e47f37d90297ae209f42ed196e766b28a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-01-11T15:21:18Z","title_canon_sha256":"a1ec355550e2c97710eedafff2d0f8334061fc3b1a9f85431ce8a1e279b26f9e"},"schema_version":"1.0","source":{"id":"1801.03811","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.03811","created_at":"2026-05-17T23:57:15Z"},{"alias_kind":"arxiv_version","alias_value":"1801.03811v3","created_at":"2026-05-17T23:57:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.03811","created_at":"2026-05-17T23:57:15Z"},{"alias_kind":"pith_short_12","alias_value":"E2OK5EFA3FIG","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_16","alias_value":"E2OK5EFA3FIGQQZN","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_8","alias_value":"E2OK5EFA","created_at":"2026-05-18T12:32:19Z"}],"graph_snapshots":[{"event_id":"sha256:b05676ae67f94c81b6852f0cace1569751d9271fa5239290d094a2858602fc18","target":"graph","created_at":"2026-05-17T23:57:15Z","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":"In all practical communication channels, the code word consist of Gaussian states and the measurement strategy is often a Gaussian detector such as homodyning or heterodyning. In this paper we investigate the communication performance using a phase-conjugated alphabet and joint Gaussian detection in an phase-insensitive amplifying channel. We find that a communication scheme consisting of a phase-conjugated alphabet of coherent states and a joint detection strategy significantly outperforms a standard coherent-state strategy based in individual detection. Moreover, we show that the performance","authors_text":"Clemens Sch\\\"afermeier, Ulrik L. Andersen","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-01-11T15:21:18Z","title":"Mutual information of optical communication in phase conjugating Gaussian channels"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.03811","kind":"arxiv","version":3},"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:f8c8ec40b69d071e2d83ee423acbc908b0b56455d1c39e58874948b87bd77cb3","target":"record","created_at":"2026-05-17T23:57:15Z","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":"9ad64595b1aa713af2842a2adb450c2e47f37d90297ae209f42ed196e766b28a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-01-11T15:21:18Z","title_canon_sha256":"a1ec355550e2c97710eedafff2d0f8334061fc3b1a9f85431ce8a1e279b26f9e"},"schema_version":"1.0","source":{"id":"1801.03811","kind":"arxiv","version":3}},"canonical_sha256":"269cae90a0d95068432d1e0b4a9540b03eaa31332b08932ba8ef8a1576ef6d38","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"269cae90a0d95068432d1e0b4a9540b03eaa31332b08932ba8ef8a1576ef6d38","first_computed_at":"2026-05-17T23:57:15.471368Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:57:15.471368Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Wf37K/Fmwz1vxYGqxs2m4suF7ke0T3hbYbwfwEQYldIgRTNLbDpgCZoqHaylA+ZhzN4UvN2/gtmihDyDV3OfDQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:57:15.471812Z","signed_message":"canonical_sha256_bytes"},"source_id":"1801.03811","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f8c8ec40b69d071e2d83ee423acbc908b0b56455d1c39e58874948b87bd77cb3","sha256:b05676ae67f94c81b6852f0cace1569751d9271fa5239290d094a2858602fc18"],"state_sha256":"95448d617ae7c49915d8ac9f6b4086098221be5bd9b03357bbf97cb0661e00ee"}