{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:YPMBZ2ZXSX6NCF57HBITSFBHGY","short_pith_number":"pith:YPMBZ2ZX","canonical_record":{"source":{"id":"1705.00436","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2017-05-01T07:46:06Z","cross_cats_sorted":["physics.app-ph","quant-ph"],"title_canon_sha256":"e89b1c2cae5a5cbcf270457a002ac49a6570713e1319243c8f03961fcbd64e88","abstract_canon_sha256":"1f4a2c15d9b44ae2b3d8075224c9f20ad94959209d1051ee570414de911b1d4f"},"schema_version":"1.0"},"canonical_sha256":"c3d81ceb3795fcd117bf385139142736014c7b6994a5120efffa75cf117d7acb","source":{"kind":"arxiv","id":"1705.00436","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1705.00436","created_at":"2026-05-18T00:26:37Z"},{"alias_kind":"arxiv_version","alias_value":"1705.00436v2","created_at":"2026-05-18T00:26:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1705.00436","created_at":"2026-05-18T00:26:37Z"},{"alias_kind":"pith_short_12","alias_value":"YPMBZ2ZXSX6N","created_at":"2026-05-18T12:31:56Z"},{"alias_kind":"pith_short_16","alias_value":"YPMBZ2ZXSX6NCF57","created_at":"2026-05-18T12:31:56Z"},{"alias_kind":"pith_short_8","alias_value":"YPMBZ2ZX","created_at":"2026-05-18T12:31:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:YPMBZ2ZXSX6NCF57HBITSFBHGY","target":"record","payload":{"canonical_record":{"source":{"id":"1705.00436","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2017-05-01T07:46:06Z","cross_cats_sorted":["physics.app-ph","quant-ph"],"title_canon_sha256":"e89b1c2cae5a5cbcf270457a002ac49a6570713e1319243c8f03961fcbd64e88","abstract_canon_sha256":"1f4a2c15d9b44ae2b3d8075224c9f20ad94959209d1051ee570414de911b1d4f"},"schema_version":"1.0"},"canonical_sha256":"c3d81ceb3795fcd117bf385139142736014c7b6994a5120efffa75cf117d7acb","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:26:37.112244Z","signature_b64":"ZOPDsmhE6cP+kck7aV/m9o+U7BEAnE3AnXwdXEy7T973diCcmDS8N1HfolgM6lUT81rcz58r5NIk70fVOZQ2Cw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c3d81ceb3795fcd117bf385139142736014c7b6994a5120efffa75cf117d7acb","last_reissued_at":"2026-05-18T00:26:37.111629Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:26:37.111629Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1705.00436","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:26:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jP4nd2s9ddVvw4N8aqRlbx1YI//gqYBk6Btp3ZoObIjarbPby4GNOgZGZbTXvtB9zXEzyuRoJdmucvBbscw7AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T17:03:40.306658Z"},"content_sha256":"ca9059299917e70ff1cb5974bf994df69c16ce8ecdbb5b140844ebd2895f5559","schema_version":"1.0","event_id":"sha256:ca9059299917e70ff1cb5974bf994df69c16ce8ecdbb5b140844ebd2895f5559"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:YPMBZ2ZXSX6NCF57HBITSFBHGY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Quantum-limited directional amplifiers with optomechanics","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.app-ph","quant-ph"],"primary_cat":"cond-mat.mes-hall","authors_text":"Alexey K. Feofanov, Andreas Nunnenkamp, Daniel Malz, L\\'aszl\\'o D. T\\'oth, Nathan R. Bernier, Tobias J. Kippenberg","submitted_at":"2017-05-01T07:46:06Z","abstract_excerpt":"Directional amplifiers are an important resource in quantum information processing, as they protect sensitive quantum systems from excess noise. Here, we propose an implementation of phase-preserving and phase-sensitive directional amplifiers for microwave signals in an electromechanical setup comprising two microwave cavities and two mechanical resonators. We show that both can reach their respective quantum limits on added noise. In the reverse direction, they emit thermal noise stemming from the mechanical resonators and we discuss how this noise can be suppressed, a crucial aspect for tech"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1705.00436","kind":"arxiv","version":2},"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":"2026-05-18T00:26:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"O9ewV1Nw+WkeLDacnVYRX7EVBAvlQrIkTyWCNyJwJb+fOVP8+M/h4sPXefTe/JghHszCvgpjp4gt60vV1xjiAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T17:03:40.307009Z"},"content_sha256":"8e63ed54da1e768cbdeb0abb72d4e65be7b9cbb5f41a66b62e880198bf32513f","schema_version":"1.0","event_id":"sha256:8e63ed54da1e768cbdeb0abb72d4e65be7b9cbb5f41a66b62e880198bf32513f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YPMBZ2ZXSX6NCF57HBITSFBHGY/bundle.json","state_url":"https://pith.science/pith/YPMBZ2ZXSX6NCF57HBITSFBHGY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YPMBZ2ZXSX6NCF57HBITSFBHGY/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":"2026-06-02T17:03:40Z","links":{"resolver":"https://pith.science/pith/YPMBZ2ZXSX6NCF57HBITSFBHGY","bundle":"https://pith.science/pith/YPMBZ2ZXSX6NCF57HBITSFBHGY/bundle.json","state":"https://pith.science/pith/YPMBZ2ZXSX6NCF57HBITSFBHGY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YPMBZ2ZXSX6NCF57HBITSFBHGY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:YPMBZ2ZXSX6NCF57HBITSFBHGY","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":"1f4a2c15d9b44ae2b3d8075224c9f20ad94959209d1051ee570414de911b1d4f","cross_cats_sorted":["physics.app-ph","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2017-05-01T07:46:06Z","title_canon_sha256":"e89b1c2cae5a5cbcf270457a002ac49a6570713e1319243c8f03961fcbd64e88"},"schema_version":"1.0","source":{"id":"1705.00436","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1705.00436","created_at":"2026-05-18T00:26:37Z"},{"alias_kind":"arxiv_version","alias_value":"1705.00436v2","created_at":"2026-05-18T00:26:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1705.00436","created_at":"2026-05-18T00:26:37Z"},{"alias_kind":"pith_short_12","alias_value":"YPMBZ2ZXSX6N","created_at":"2026-05-18T12:31:56Z"},{"alias_kind":"pith_short_16","alias_value":"YPMBZ2ZXSX6NCF57","created_at":"2026-05-18T12:31:56Z"},{"alias_kind":"pith_short_8","alias_value":"YPMBZ2ZX","created_at":"2026-05-18T12:31:56Z"}],"graph_snapshots":[{"event_id":"sha256:8e63ed54da1e768cbdeb0abb72d4e65be7b9cbb5f41a66b62e880198bf32513f","target":"graph","created_at":"2026-05-18T00:26:37Z","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":"Directional amplifiers are an important resource in quantum information processing, as they protect sensitive quantum systems from excess noise. Here, we propose an implementation of phase-preserving and phase-sensitive directional amplifiers for microwave signals in an electromechanical setup comprising two microwave cavities and two mechanical resonators. We show that both can reach their respective quantum limits on added noise. In the reverse direction, they emit thermal noise stemming from the mechanical resonators and we discuss how this noise can be suppressed, a crucial aspect for tech","authors_text":"Alexey K. Feofanov, Andreas Nunnenkamp, Daniel Malz, L\\'aszl\\'o D. T\\'oth, Nathan R. Bernier, Tobias J. Kippenberg","cross_cats":["physics.app-ph","quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2017-05-01T07:46:06Z","title":"Quantum-limited directional amplifiers with optomechanics"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1705.00436","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:ca9059299917e70ff1cb5974bf994df69c16ce8ecdbb5b140844ebd2895f5559","target":"record","created_at":"2026-05-18T00:26:37Z","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":"1f4a2c15d9b44ae2b3d8075224c9f20ad94959209d1051ee570414de911b1d4f","cross_cats_sorted":["physics.app-ph","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2017-05-01T07:46:06Z","title_canon_sha256":"e89b1c2cae5a5cbcf270457a002ac49a6570713e1319243c8f03961fcbd64e88"},"schema_version":"1.0","source":{"id":"1705.00436","kind":"arxiv","version":2}},"canonical_sha256":"c3d81ceb3795fcd117bf385139142736014c7b6994a5120efffa75cf117d7acb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c3d81ceb3795fcd117bf385139142736014c7b6994a5120efffa75cf117d7acb","first_computed_at":"2026-05-18T00:26:37.111629Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:26:37.111629Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ZOPDsmhE6cP+kck7aV/m9o+U7BEAnE3AnXwdXEy7T973diCcmDS8N1HfolgM6lUT81rcz58r5NIk70fVOZQ2Cw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:26:37.112244Z","signed_message":"canonical_sha256_bytes"},"source_id":"1705.00436","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ca9059299917e70ff1cb5974bf994df69c16ce8ecdbb5b140844ebd2895f5559","sha256:8e63ed54da1e768cbdeb0abb72d4e65be7b9cbb5f41a66b62e880198bf32513f"],"state_sha256":"168ec44f90d967e80edb4a1b86aca6169cf6a4fe2ff3b1512eaad416a13e5e0a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+ynVRWodfelGCaL1iKzav3Yo9NYr+edHIbL84gW5QGkVvfjzpAx7OiYyy5gfxrmvISDdGouqJZSgce06QdoyAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T17:03:40.308973Z","bundle_sha256":"2f6d9aee2f54fb1b6342283bf8ade81e8c881cb7c4686cf5e8cae345e766aa66"}}