{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:6GBPPPN4GNEZONYBLU7UDXJXLC","short_pith_number":"pith:6GBPPPN4","canonical_record":{"source":{"id":"1710.10405","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-10-28T07:02:55Z","cross_cats_sorted":[],"title_canon_sha256":"ce31ac953ab618b5c6486895cb77dfc8523c9217cc62dc74de0b09d491df04dd","abstract_canon_sha256":"2ccb797179c691387da6386fc45fb9ba522b5fe79fc86a304e6fcd767fe41db8"},"schema_version":"1.0"},"canonical_sha256":"f182f7bdbc33499737015d3f41dd3758abe6b8c78a4fc7aa9775b5c7466b488b","source":{"kind":"arxiv","id":"1710.10405","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1710.10405","created_at":"2026-05-18T00:10:03Z"},{"alias_kind":"arxiv_version","alias_value":"1710.10405v1","created_at":"2026-05-18T00:10:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1710.10405","created_at":"2026-05-18T00:10:03Z"},{"alias_kind":"pith_short_12","alias_value":"6GBPPPN4GNEZ","created_at":"2026-05-18T12:31:03Z"},{"alias_kind":"pith_short_16","alias_value":"6GBPPPN4GNEZONYB","created_at":"2026-05-18T12:31:03Z"},{"alias_kind":"pith_short_8","alias_value":"6GBPPPN4","created_at":"2026-05-18T12:31:03Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:6GBPPPN4GNEZONYBLU7UDXJXLC","target":"record","payload":{"canonical_record":{"source":{"id":"1710.10405","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-10-28T07:02:55Z","cross_cats_sorted":[],"title_canon_sha256":"ce31ac953ab618b5c6486895cb77dfc8523c9217cc62dc74de0b09d491df04dd","abstract_canon_sha256":"2ccb797179c691387da6386fc45fb9ba522b5fe79fc86a304e6fcd767fe41db8"},"schema_version":"1.0"},"canonical_sha256":"f182f7bdbc33499737015d3f41dd3758abe6b8c78a4fc7aa9775b5c7466b488b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:10:03.863547Z","signature_b64":"LxGdFd3+knDm1BnMg08BBf4Sy304Sw9GotdN71sYh2cP/juACywFDZ0fLXZcEsCaQU2qlXmQASLbApiVlbSHAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f182f7bdbc33499737015d3f41dd3758abe6b8c78a4fc7aa9775b5c7466b488b","last_reissued_at":"2026-05-18T00:10:03.862819Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:10:03.862819Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1710.10405","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":"2026-05-18T00:10:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"c+nKI7lCwx/xxNLjBVLrXE7ny0BoFMDGBMATYP6z8rbQCbj+DfEg9ENPT7dz+ZxilQuQ8VbSsaa6jf1A98MZCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T11:33:19.604378Z"},"content_sha256":"2c9922ccd4e49a3e797c670569590cf227c7e1b0916468a3c5172a5f40ca7bd2","schema_version":"1.0","event_id":"sha256:2c9922ccd4e49a3e797c670569590cf227c7e1b0916468a3c5172a5f40ca7bd2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:6GBPPPN4GNEZONYBLU7UDXJXLC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Overcoming the SQL in gravitational wave detectors using spin systems with negative effective mass","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Eugene S. Polzik, Farid Khalili","submitted_at":"2017-10-28T07:02:55Z","abstract_excerpt":"Quantum back action (QBA) of a measurement limits the precision of observation of the motion of a free mass. This profound effect dabbed the \"Heisenberg microscope\" in the early days of quantum mechanics, leads to the standard quantum limit (SQL) stemming from the balance between the measurement sensitivity and the QBA. Here we consider the measurement of motion of a free mass performed in a quantum reference frame with an effective negative mass which is not limited by QBA. As a result, the disturbance on the motion of a free mass can be measured beyond SQL. QBA-limited detection of motion fo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1710.10405","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":"2026-05-18T00:10:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Da6CHoVhb+XatRjbrrD9c3zOjAXNIEXfBluByz6Q6LaGm83aeBTrZVlHUZ5Wv1pP/66QzvEACynW1+TqgRGICg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T11:33:19.604945Z"},"content_sha256":"2d6839864947ab4f451cc8e28567437399a6f66ab3d4a5ebe46b1305ea20be6e","schema_version":"1.0","event_id":"sha256:2d6839864947ab4f451cc8e28567437399a6f66ab3d4a5ebe46b1305ea20be6e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/6GBPPPN4GNEZONYBLU7UDXJXLC/bundle.json","state_url":"https://pith.science/pith/6GBPPPN4GNEZONYBLU7UDXJXLC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/6GBPPPN4GNEZONYBLU7UDXJXLC/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":"2026-05-30T11:33:19Z","links":{"resolver":"https://pith.science/pith/6GBPPPN4GNEZONYBLU7UDXJXLC","bundle":"https://pith.science/pith/6GBPPPN4GNEZONYBLU7UDXJXLC/bundle.json","state":"https://pith.science/pith/6GBPPPN4GNEZONYBLU7UDXJXLC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/6GBPPPN4GNEZONYBLU7UDXJXLC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:6GBPPPN4GNEZONYBLU7UDXJXLC","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":"2ccb797179c691387da6386fc45fb9ba522b5fe79fc86a304e6fcd767fe41db8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-10-28T07:02:55Z","title_canon_sha256":"ce31ac953ab618b5c6486895cb77dfc8523c9217cc62dc74de0b09d491df04dd"},"schema_version":"1.0","source":{"id":"1710.10405","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1710.10405","created_at":"2026-05-18T00:10:03Z"},{"alias_kind":"arxiv_version","alias_value":"1710.10405v1","created_at":"2026-05-18T00:10:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1710.10405","created_at":"2026-05-18T00:10:03Z"},{"alias_kind":"pith_short_12","alias_value":"6GBPPPN4GNEZ","created_at":"2026-05-18T12:31:03Z"},{"alias_kind":"pith_short_16","alias_value":"6GBPPPN4GNEZONYB","created_at":"2026-05-18T12:31:03Z"},{"alias_kind":"pith_short_8","alias_value":"6GBPPPN4","created_at":"2026-05-18T12:31:03Z"}],"graph_snapshots":[{"event_id":"sha256:2d6839864947ab4f451cc8e28567437399a6f66ab3d4a5ebe46b1305ea20be6e","target":"graph","created_at":"2026-05-18T00:10:03Z","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 back action (QBA) of a measurement limits the precision of observation of the motion of a free mass. This profound effect dabbed the \"Heisenberg microscope\" in the early days of quantum mechanics, leads to the standard quantum limit (SQL) stemming from the balance between the measurement sensitivity and the QBA. Here we consider the measurement of motion of a free mass performed in a quantum reference frame with an effective negative mass which is not limited by QBA. As a result, the disturbance on the motion of a free mass can be measured beyond SQL. QBA-limited detection of motion fo","authors_text":"Eugene S. Polzik, Farid Khalili","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-10-28T07:02:55Z","title":"Overcoming the SQL in gravitational wave detectors using spin systems with negative effective mass"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1710.10405","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":"sha256:2c9922ccd4e49a3e797c670569590cf227c7e1b0916468a3c5172a5f40ca7bd2","target":"record","created_at":"2026-05-18T00:10:03Z","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":"2ccb797179c691387da6386fc45fb9ba522b5fe79fc86a304e6fcd767fe41db8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-10-28T07:02:55Z","title_canon_sha256":"ce31ac953ab618b5c6486895cb77dfc8523c9217cc62dc74de0b09d491df04dd"},"schema_version":"1.0","source":{"id":"1710.10405","kind":"arxiv","version":1}},"canonical_sha256":"f182f7bdbc33499737015d3f41dd3758abe6b8c78a4fc7aa9775b5c7466b488b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f182f7bdbc33499737015d3f41dd3758abe6b8c78a4fc7aa9775b5c7466b488b","first_computed_at":"2026-05-18T00:10:03.862819Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:10:03.862819Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"LxGdFd3+knDm1BnMg08BBf4Sy304Sw9GotdN71sYh2cP/juACywFDZ0fLXZcEsCaQU2qlXmQASLbApiVlbSHAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:10:03.863547Z","signed_message":"canonical_sha256_bytes"},"source_id":"1710.10405","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2c9922ccd4e49a3e797c670569590cf227c7e1b0916468a3c5172a5f40ca7bd2","sha256:2d6839864947ab4f451cc8e28567437399a6f66ab3d4a5ebe46b1305ea20be6e"],"state_sha256":"955d36dd25a43f05a82a9748dbd424c25e26839a4772177c71e1d0108dec7040"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7xjhSI3dUeS2Ty1RUC9bMZ/JK6bamlqsAlHYfZw3GoTX44yoiMtWwbmWg+F0aXq99opfxqGY1EGE+PRLZQZ2Dg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T11:33:19.607706Z","bundle_sha256":"1f898587046728822effebb8b13ae9459680d8adf146d9add8edeeca9b71e8b8"}}