{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:XO5PZ4YIJGICBVHBQTXYU5HU46","short_pith_number":"pith:XO5PZ4YI","canonical_record":{"source":{"id":"1701.04602","kind":"arxiv","version":3},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2017-01-17T10:02:11Z","cross_cats_sorted":[],"title_canon_sha256":"1062b8a8c9c0e3a52a703cb263007f1947a441b08365f61479f82a37fe24117b","abstract_canon_sha256":"de894b9579eeb2542591d7a40ba68a7fdd00a188eeb0e2d22810624e4135ddde"},"schema_version":"1.0"},"canonical_sha256":"bbbafcf308499020d4e184ef8a74f4e782a70942feab1b8b11682fe46ee8e5f3","source":{"kind":"arxiv","id":"1701.04602","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1701.04602","created_at":"2026-05-18T00:46:37Z"},{"alias_kind":"arxiv_version","alias_value":"1701.04602v3","created_at":"2026-05-18T00:46:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1701.04602","created_at":"2026-05-18T00:46:37Z"},{"alias_kind":"pith_short_12","alias_value":"XO5PZ4YIJGIC","created_at":"2026-05-18T12:31:56Z"},{"alias_kind":"pith_short_16","alias_value":"XO5PZ4YIJGICBVHB","created_at":"2026-05-18T12:31:56Z"},{"alias_kind":"pith_short_8","alias_value":"XO5PZ4YI","created_at":"2026-05-18T12:31:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:XO5PZ4YIJGICBVHBQTXYU5HU46","target":"record","payload":{"canonical_record":{"source":{"id":"1701.04602","kind":"arxiv","version":3},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2017-01-17T10:02:11Z","cross_cats_sorted":[],"title_canon_sha256":"1062b8a8c9c0e3a52a703cb263007f1947a441b08365f61479f82a37fe24117b","abstract_canon_sha256":"de894b9579eeb2542591d7a40ba68a7fdd00a188eeb0e2d22810624e4135ddde"},"schema_version":"1.0"},"canonical_sha256":"bbbafcf308499020d4e184ef8a74f4e782a70942feab1b8b11682fe46ee8e5f3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:46:37.921210Z","signature_b64":"1YtPpxsYsPsgRYTml2nzIELgChk0qdMR7y72njxeeYOlw6II41eR4CFxH0tWS3A03yNykoN96dXUd9IcnxumBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bbbafcf308499020d4e184ef8a74f4e782a70942feab1b8b11682fe46ee8e5f3","last_reissued_at":"2026-05-18T00:46:37.920642Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:46:37.920642Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1701.04602","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:46:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QJrVSpN5bgP1fOSoneygJIE760Gu3U89+Q5jXBpYiMdUe4mQxjH5aN0sauOyn2I6YgGUCkZ/xC8ICN1Qt6ZWAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T23:49:16.212090Z"},"content_sha256":"ce2f5262b9689e73c27817baec59a2272b159295593c8387a9218976f18c19ce","schema_version":"1.0","event_id":"sha256:ce2f5262b9689e73c27817baec59a2272b159295593c8387a9218976f18c19ce"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:XO5PZ4YIJGICBVHBQTXYU5HU46","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Quantum amplification and purification of noisy coherent states","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Giulio Chiribella, Xiaobin Zhao","submitted_at":"2017-01-17T10:02:11Z","abstract_excerpt":"Quantum-limited amplifiers increase the amplitude of quantum signals at the price of introducing additional noise. Quantum purification protocols operate in the reverse way, by reducing the noise while attenuating the signal. Here we investigate a scenario that interpolates between these two extremes. We search for the optimal physical process that generates $M$ approximate copies of pure and amplified coherent state, starting from $N$ copies of a noisy coherent state with Gaussian modulation. We prove that the optimal deterministic processes are always Gaussian, whereas non-Gaussianity powers"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1701.04602","kind":"arxiv","version":3},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:46:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hOBdEK+SORrVh0wT3V6oUJguDfdZSKe32Jh4jO8kwRb2atT53X+2Y7jNQQGWFmLewqK1sDmgXsKQfe5ux3NyDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T23:49:16.212788Z"},"content_sha256":"a6c2258d583e56bdfa1d03fb56326d1cb54ae1689edc59d5158a49009b7d3388","schema_version":"1.0","event_id":"sha256:a6c2258d583e56bdfa1d03fb56326d1cb54ae1689edc59d5158a49009b7d3388"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XO5PZ4YIJGICBVHBQTXYU5HU46/bundle.json","state_url":"https://pith.science/pith/XO5PZ4YIJGICBVHBQTXYU5HU46/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XO5PZ4YIJGICBVHBQTXYU5HU46/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-28T23:49:16Z","links":{"resolver":"https://pith.science/pith/XO5PZ4YIJGICBVHBQTXYU5HU46","bundle":"https://pith.science/pith/XO5PZ4YIJGICBVHBQTXYU5HU46/bundle.json","state":"https://pith.science/pith/XO5PZ4YIJGICBVHBQTXYU5HU46/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XO5PZ4YIJGICBVHBQTXYU5HU46/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:XO5PZ4YIJGICBVHBQTXYU5HU46","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":"de894b9579eeb2542591d7a40ba68a7fdd00a188eeb0e2d22810624e4135ddde","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2017-01-17T10:02:11Z","title_canon_sha256":"1062b8a8c9c0e3a52a703cb263007f1947a441b08365f61479f82a37fe24117b"},"schema_version":"1.0","source":{"id":"1701.04602","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1701.04602","created_at":"2026-05-18T00:46:37Z"},{"alias_kind":"arxiv_version","alias_value":"1701.04602v3","created_at":"2026-05-18T00:46:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1701.04602","created_at":"2026-05-18T00:46:37Z"},{"alias_kind":"pith_short_12","alias_value":"XO5PZ4YIJGIC","created_at":"2026-05-18T12:31:56Z"},{"alias_kind":"pith_short_16","alias_value":"XO5PZ4YIJGICBVHB","created_at":"2026-05-18T12:31:56Z"},{"alias_kind":"pith_short_8","alias_value":"XO5PZ4YI","created_at":"2026-05-18T12:31:56Z"}],"graph_snapshots":[{"event_id":"sha256:a6c2258d583e56bdfa1d03fb56326d1cb54ae1689edc59d5158a49009b7d3388","target":"graph","created_at":"2026-05-18T00:46:37Z","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-limited amplifiers increase the amplitude of quantum signals at the price of introducing additional noise. Quantum purification protocols operate in the reverse way, by reducing the noise while attenuating the signal. Here we investigate a scenario that interpolates between these two extremes. We search for the optimal physical process that generates $M$ approximate copies of pure and amplified coherent state, starting from $N$ copies of a noisy coherent state with Gaussian modulation. We prove that the optimal deterministic processes are always Gaussian, whereas non-Gaussianity powers","authors_text":"Giulio Chiribella, Xiaobin Zhao","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2017-01-17T10:02:11Z","title":"Quantum amplification and purification of noisy coherent states"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1701.04602","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:ce2f5262b9689e73c27817baec59a2272b159295593c8387a9218976f18c19ce","target":"record","created_at":"2026-05-18T00:46:37Z","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":"de894b9579eeb2542591d7a40ba68a7fdd00a188eeb0e2d22810624e4135ddde","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2017-01-17T10:02:11Z","title_canon_sha256":"1062b8a8c9c0e3a52a703cb263007f1947a441b08365f61479f82a37fe24117b"},"schema_version":"1.0","source":{"id":"1701.04602","kind":"arxiv","version":3}},"canonical_sha256":"bbbafcf308499020d4e184ef8a74f4e782a70942feab1b8b11682fe46ee8e5f3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bbbafcf308499020d4e184ef8a74f4e782a70942feab1b8b11682fe46ee8e5f3","first_computed_at":"2026-05-18T00:46:37.920642Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:46:37.920642Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"1YtPpxsYsPsgRYTml2nzIELgChk0qdMR7y72njxeeYOlw6II41eR4CFxH0tWS3A03yNykoN96dXUd9IcnxumBw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:46:37.921210Z","signed_message":"canonical_sha256_bytes"},"source_id":"1701.04602","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ce2f5262b9689e73c27817baec59a2272b159295593c8387a9218976f18c19ce","sha256:a6c2258d583e56bdfa1d03fb56326d1cb54ae1689edc59d5158a49009b7d3388"],"state_sha256":"6ac400a801199748b8fa77edfbbcf95ad4ed9ade5250510b6388fb174d9a8d15"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/gJr4Ght7tMdIyVm2piC2iyv3L5Hpspv/Yx+FzdLa95GKD8QcFr986JF4qfhfzlru24ndNuzVStYhDm3Y1ShAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T23:49:16.216465Z","bundle_sha256":"e049492255baf4301a162229c622f0b0fea5167fae9126e7f22180662959f9ae"}}