{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:WXBXL5PUWJDB5TUQK5HVHOTHPE","short_pith_number":"pith:WXBXL5PU","canonical_record":{"source":{"id":"1205.6329","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-05-29T11:15:08Z","cross_cats_sorted":[],"title_canon_sha256":"5859b8adca5b5a40c96c1b7bfb586691af9a159d1ff97a8df4c57404a7b3aab7","abstract_canon_sha256":"8f5b002056c18a7495a9e81e7d1783fe8a6e33989f988576d0136ee71d1fcf68"},"schema_version":"1.0"},"canonical_sha256":"b5c375f5f4b2461ece90574f53ba67793f8f0610b71a18e87a7d77d695882910","source":{"kind":"arxiv","id":"1205.6329","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1205.6329","created_at":"2026-05-18T01:57:16Z"},{"alias_kind":"arxiv_version","alias_value":"1205.6329v1","created_at":"2026-05-18T01:57:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1205.6329","created_at":"2026-05-18T01:57:16Z"},{"alias_kind":"pith_short_12","alias_value":"WXBXL5PUWJDB","created_at":"2026-05-18T12:27:27Z"},{"alias_kind":"pith_short_16","alias_value":"WXBXL5PUWJDB5TUQ","created_at":"2026-05-18T12:27:27Z"},{"alias_kind":"pith_short_8","alias_value":"WXBXL5PU","created_at":"2026-05-18T12:27:27Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:WXBXL5PUWJDB5TUQK5HVHOTHPE","target":"record","payload":{"canonical_record":{"source":{"id":"1205.6329","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-05-29T11:15:08Z","cross_cats_sorted":[],"title_canon_sha256":"5859b8adca5b5a40c96c1b7bfb586691af9a159d1ff97a8df4c57404a7b3aab7","abstract_canon_sha256":"8f5b002056c18a7495a9e81e7d1783fe8a6e33989f988576d0136ee71d1fcf68"},"schema_version":"1.0"},"canonical_sha256":"b5c375f5f4b2461ece90574f53ba67793f8f0610b71a18e87a7d77d695882910","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:57:16.157834Z","signature_b64":"5+GeUKg4azqaQMpCrGO0vtagmwKpHX0jO8t8Tdijf4aN/fWpVzUftu9xLP+fhazcKCSX7oo+XDvd8rnpTlZGCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b5c375f5f4b2461ece90574f53ba67793f8f0610b71a18e87a7d77d695882910","last_reissued_at":"2026-05-18T01:57:16.157145Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:57:16.157145Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1205.6329","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:57:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bJOBeR48dwy3LCK07p/fdOfz548R8kE8bLJFu7MtHfyW05xqAiOW5Qguw/l9zETztpjv/Lmxo7LPgS74sYzxCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T12:17:32.641121Z"},"content_sha256":"5263f6c16f7b7f31b68482887fc9c1c9acdbf4ee84178e5a64e3c61376c45ab1","schema_version":"1.0","event_id":"sha256:5263f6c16f7b7f31b68482887fc9c1c9acdbf4ee84178e5a64e3c61376c45ab1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:WXBXL5PUWJDB5TUQK5HVHOTHPE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Two-qubit parametric amplifier: large amplification of weak signals","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"A. L. Rakhmanov, A. M. Zagoskin, A. N. Omelyanchouk, Franco Nori, S. Savel'ev, Z. Washington","submitted_at":"2012-05-29T11:15:08Z","abstract_excerpt":"Using numerical simulations, we show that two coupled qubits can amplify a weak signal about hundredfold. This can be achieved if the two qubits are biased simultaneously by this weak signal and a strong pump signal, both of which having frequencies close to the inter-level transitions in the system. The weak signal strongly affects the spectrum generated by the strong pumping drive by producing and controlling mixed harmonics with amplitudes of the order of the main harmonic of the strong drive. We show that the amplification is robust with respect to noise, with an intensity of the order of "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1205.6329","kind":"arxiv","version":1},"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":"2026-05-18T01:57:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5Ee1F4YT+0dJEyNMO3ybfwFCO2Q6sTuJIWEAi6SkHCw4MVNduRT3AfL/MLUqJ4SKK5lyW3SYPCdkZfScrqeeBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T12:17:32.641478Z"},"content_sha256":"9d3e21f83aeb83d6cf38907afe1fbf1c82388033304b241895e35885ffff6c40","schema_version":"1.0","event_id":"sha256:9d3e21f83aeb83d6cf38907afe1fbf1c82388033304b241895e35885ffff6c40"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WXBXL5PUWJDB5TUQK5HVHOTHPE/bundle.json","state_url":"https://pith.science/pith/WXBXL5PUWJDB5TUQK5HVHOTHPE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WXBXL5PUWJDB5TUQK5HVHOTHPE/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":"2026-06-01T12:17:32Z","links":{"resolver":"https://pith.science/pith/WXBXL5PUWJDB5TUQK5HVHOTHPE","bundle":"https://pith.science/pith/WXBXL5PUWJDB5TUQK5HVHOTHPE/bundle.json","state":"https://pith.science/pith/WXBXL5PUWJDB5TUQK5HVHOTHPE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WXBXL5PUWJDB5TUQK5HVHOTHPE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:WXBXL5PUWJDB5TUQK5HVHOTHPE","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":"8f5b002056c18a7495a9e81e7d1783fe8a6e33989f988576d0136ee71d1fcf68","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-05-29T11:15:08Z","title_canon_sha256":"5859b8adca5b5a40c96c1b7bfb586691af9a159d1ff97a8df4c57404a7b3aab7"},"schema_version":"1.0","source":{"id":"1205.6329","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1205.6329","created_at":"2026-05-18T01:57:16Z"},{"alias_kind":"arxiv_version","alias_value":"1205.6329v1","created_at":"2026-05-18T01:57:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1205.6329","created_at":"2026-05-18T01:57:16Z"},{"alias_kind":"pith_short_12","alias_value":"WXBXL5PUWJDB","created_at":"2026-05-18T12:27:27Z"},{"alias_kind":"pith_short_16","alias_value":"WXBXL5PUWJDB5TUQ","created_at":"2026-05-18T12:27:27Z"},{"alias_kind":"pith_short_8","alias_value":"WXBXL5PU","created_at":"2026-05-18T12:27:27Z"}],"graph_snapshots":[{"event_id":"sha256:9d3e21f83aeb83d6cf38907afe1fbf1c82388033304b241895e35885ffff6c40","target":"graph","created_at":"2026-05-18T01:57:16Z","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":"Using numerical simulations, we show that two coupled qubits can amplify a weak signal about hundredfold. This can be achieved if the two qubits are biased simultaneously by this weak signal and a strong pump signal, both of which having frequencies close to the inter-level transitions in the system. The weak signal strongly affects the spectrum generated by the strong pumping drive by producing and controlling mixed harmonics with amplitudes of the order of the main harmonic of the strong drive. We show that the amplification is robust with respect to noise, with an intensity of the order of ","authors_text":"A. L. Rakhmanov, A. M. Zagoskin, A. N. Omelyanchouk, Franco Nori, S. Savel'ev, Z. Washington","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-05-29T11:15:08Z","title":"Two-qubit parametric amplifier: large amplification of weak signals"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1205.6329","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":"sha256:5263f6c16f7b7f31b68482887fc9c1c9acdbf4ee84178e5a64e3c61376c45ab1","target":"record","created_at":"2026-05-18T01:57:16Z","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":"8f5b002056c18a7495a9e81e7d1783fe8a6e33989f988576d0136ee71d1fcf68","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-05-29T11:15:08Z","title_canon_sha256":"5859b8adca5b5a40c96c1b7bfb586691af9a159d1ff97a8df4c57404a7b3aab7"},"schema_version":"1.0","source":{"id":"1205.6329","kind":"arxiv","version":1}},"canonical_sha256":"b5c375f5f4b2461ece90574f53ba67793f8f0610b71a18e87a7d77d695882910","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b5c375f5f4b2461ece90574f53ba67793f8f0610b71a18e87a7d77d695882910","first_computed_at":"2026-05-18T01:57:16.157145Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:57:16.157145Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5+GeUKg4azqaQMpCrGO0vtagmwKpHX0jO8t8Tdijf4aN/fWpVzUftu9xLP+fhazcKCSX7oo+XDvd8rnpTlZGCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:57:16.157834Z","signed_message":"canonical_sha256_bytes"},"source_id":"1205.6329","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5263f6c16f7b7f31b68482887fc9c1c9acdbf4ee84178e5a64e3c61376c45ab1","sha256:9d3e21f83aeb83d6cf38907afe1fbf1c82388033304b241895e35885ffff6c40"],"state_sha256":"3ff69d1dfbc8f23a4cc3216f227ae46691f365604e0011b9b79548e2ffd0388d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RyudosIMUKgNfZTOfSqUWKYD09OAOQaG+R0mq5eAgAmcKqMkKeKxBp7vlghhV8JNAPMtzX4Ktew7HI3ikz0qDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T12:17:32.643413Z","bundle_sha256":"fa7687e4a37345725f9e30a541819c702956c50e53b23ed0fd90151b7135b822"}}