{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:RA5EPNQMGHB6523GSAUXQLBV3P","short_pith_number":"pith:RA5EPNQM","canonical_record":{"source":{"id":"2004.05515","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-04-12T00:55:33Z","cross_cats_sorted":[],"title_canon_sha256":"c35eadc370a5971020805f4874932af3344602bc75a2e9abd3b78abb890cf46e","abstract_canon_sha256":"fffdd409b09bcdbebaf498f192b84af9a3716226ad25ac29f04703832a6faec2"},"schema_version":"1.0"},"canonical_sha256":"883a47b60c31c3eeeb669029782c35dbf9587b2695a56ac41d946091131fd325","source":{"kind":"arxiv","id":"2004.05515","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2004.05515","created_at":"2026-07-05T03:11:23Z"},{"alias_kind":"arxiv_version","alias_value":"2004.05515v2","created_at":"2026-07-05T03:11:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2004.05515","created_at":"2026-07-05T03:11:23Z"},{"alias_kind":"pith_short_12","alias_value":"RA5EPNQMGHB6","created_at":"2026-07-05T03:11:23Z"},{"alias_kind":"pith_short_16","alias_value":"RA5EPNQMGHB6523G","created_at":"2026-07-05T03:11:23Z"},{"alias_kind":"pith_short_8","alias_value":"RA5EPNQM","created_at":"2026-07-05T03:11:23Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:RA5EPNQMGHB6523GSAUXQLBV3P","target":"record","payload":{"canonical_record":{"source":{"id":"2004.05515","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-04-12T00:55:33Z","cross_cats_sorted":[],"title_canon_sha256":"c35eadc370a5971020805f4874932af3344602bc75a2e9abd3b78abb890cf46e","abstract_canon_sha256":"fffdd409b09bcdbebaf498f192b84af9a3716226ad25ac29f04703832a6faec2"},"schema_version":"1.0"},"canonical_sha256":"883a47b60c31c3eeeb669029782c35dbf9587b2695a56ac41d946091131fd325","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:11:23.742818Z","signature_b64":"l490BvGz/C3e5XBvxMnEtfs+dlUZS3ToJ0sRvLJxTxmuX7OsvYbz4+imgMCdVTBB6SHPD6RvbV1HV4Kizn+NDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"883a47b60c31c3eeeb669029782c35dbf9587b2695a56ac41d946091131fd325","last_reissued_at":"2026-07-05T03:11:23.742410Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:11:23.742410Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2004.05515","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":"2026-07-05T03:11:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qmvCD+rV3lI1BE7w9ekimHXK//YGF1xvJcbqjac13ZDaUx53pv3Ml8RMu4blSouPvSY2111TSB984awKLXX8BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T01:00:36.691544Z"},"content_sha256":"a503958e32d11d49682326bd76c32a5172d9eee82243f70f82fc1fa9f5ef2ca3","schema_version":"1.0","event_id":"sha256:a503958e32d11d49682326bd76c32a5172d9eee82243f70f82fc1fa9f5ef2ca3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:RA5EPNQMGHB6523GSAUXQLBV3P","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Direct observation of deterministic macroscopic entanglement","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Alex Kwiatkowski, Emanuel Knill, Ezad Shojaee, Florent Lecocq, Gabriel A. Peterson, John D. Teufel, Jos\\'e Aumentado, Katarina Cicak, Raymond W. Simmonds, Scott Glancy, Shawn Geller, Shlomi Kotler","submitted_at":"2020-04-12T00:55:33Z","abstract_excerpt":"Quantum entanglement of mechanical systems emerges when distinct objects move with such a high degree of correlation that they can no longer be described separately. Although quantum mechanics presumably applies to objects of all sizes, directly observing entanglement becomes challenging as masses increase, requiring measurement and control with a vanishingly small error. Here, using pulsed electromechanics, we deterministically entangle two mechanical drumheads with masses of 70 pg. Through nearly quantum-limited measurements of the position and momentum quadratures of both drums, we perform "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2004.05515","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2004.05515/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T03:11:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IMHqWUy4zcsXeHFrXv+N4VwLEenTXOmKdtE0+YU4Nu+PgW8gBvAXjQYSuI4aRhJGIviRQvi7l6mL5jzLIcDYCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T01:00:36.692038Z"},"content_sha256":"770cc09ee9084539f500e5858f6814149ba0b31cfc0252fb0591552ce34c063d","schema_version":"1.0","event_id":"sha256:770cc09ee9084539f500e5858f6814149ba0b31cfc0252fb0591552ce34c063d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RA5EPNQMGHB6523GSAUXQLBV3P/bundle.json","state_url":"https://pith.science/pith/RA5EPNQMGHB6523GSAUXQLBV3P/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RA5EPNQMGHB6523GSAUXQLBV3P/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":"2026-08-23T01:00:36Z","links":{"resolver":"https://pith.science/pith/RA5EPNQMGHB6523GSAUXQLBV3P","bundle":"https://pith.science/pith/RA5EPNQMGHB6523GSAUXQLBV3P/bundle.json","state":"https://pith.science/pith/RA5EPNQMGHB6523GSAUXQLBV3P/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RA5EPNQMGHB6523GSAUXQLBV3P/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:RA5EPNQMGHB6523GSAUXQLBV3P","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":"fffdd409b09bcdbebaf498f192b84af9a3716226ad25ac29f04703832a6faec2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-04-12T00:55:33Z","title_canon_sha256":"c35eadc370a5971020805f4874932af3344602bc75a2e9abd3b78abb890cf46e"},"schema_version":"1.0","source":{"id":"2004.05515","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2004.05515","created_at":"2026-07-05T03:11:23Z"},{"alias_kind":"arxiv_version","alias_value":"2004.05515v2","created_at":"2026-07-05T03:11:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2004.05515","created_at":"2026-07-05T03:11:23Z"},{"alias_kind":"pith_short_12","alias_value":"RA5EPNQMGHB6","created_at":"2026-07-05T03:11:23Z"},{"alias_kind":"pith_short_16","alias_value":"RA5EPNQMGHB6523G","created_at":"2026-07-05T03:11:23Z"},{"alias_kind":"pith_short_8","alias_value":"RA5EPNQM","created_at":"2026-07-05T03:11:23Z"}],"graph_snapshots":[{"event_id":"sha256:770cc09ee9084539f500e5858f6814149ba0b31cfc0252fb0591552ce34c063d","target":"graph","created_at":"2026-07-05T03:11:23Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2004.05515/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Quantum entanglement of mechanical systems emerges when distinct objects move with such a high degree of correlation that they can no longer be described separately. Although quantum mechanics presumably applies to objects of all sizes, directly observing entanglement becomes challenging as masses increase, requiring measurement and control with a vanishingly small error. Here, using pulsed electromechanics, we deterministically entangle two mechanical drumheads with masses of 70 pg. Through nearly quantum-limited measurements of the position and momentum quadratures of both drums, we perform ","authors_text":"Alex Kwiatkowski, Emanuel Knill, Ezad Shojaee, Florent Lecocq, Gabriel A. Peterson, John D. Teufel, Jos\\'e Aumentado, Katarina Cicak, Raymond W. Simmonds, Scott Glancy, Shawn Geller, Shlomi Kotler","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-04-12T00:55:33Z","title":"Direct observation of deterministic macroscopic entanglement"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2004.05515","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:a503958e32d11d49682326bd76c32a5172d9eee82243f70f82fc1fa9f5ef2ca3","target":"record","created_at":"2026-07-05T03:11:23Z","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":"fffdd409b09bcdbebaf498f192b84af9a3716226ad25ac29f04703832a6faec2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-04-12T00:55:33Z","title_canon_sha256":"c35eadc370a5971020805f4874932af3344602bc75a2e9abd3b78abb890cf46e"},"schema_version":"1.0","source":{"id":"2004.05515","kind":"arxiv","version":2}},"canonical_sha256":"883a47b60c31c3eeeb669029782c35dbf9587b2695a56ac41d946091131fd325","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"883a47b60c31c3eeeb669029782c35dbf9587b2695a56ac41d946091131fd325","first_computed_at":"2026-07-05T03:11:23.742410Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:11:23.742410Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"l490BvGz/C3e5XBvxMnEtfs+dlUZS3ToJ0sRvLJxTxmuX7OsvYbz4+imgMCdVTBB6SHPD6RvbV1HV4Kizn+NDw==","signature_status":"signed_v1","signed_at":"2026-07-05T03:11:23.742818Z","signed_message":"canonical_sha256_bytes"},"source_id":"2004.05515","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a503958e32d11d49682326bd76c32a5172d9eee82243f70f82fc1fa9f5ef2ca3","sha256:770cc09ee9084539f500e5858f6814149ba0b31cfc0252fb0591552ce34c063d"],"state_sha256":"ce8fd7b7fb979f5101dad53c19c63b50e038aef82354002c2cc48d7344c69a20"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0kNYUphZf+KqtkMETSMuVzTPqOnPUlwx7MuoSb6xKu3rx+P77CZNstxXp1BEJmVhYugngBYhd8ZWRV4o9RfqDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-23T01:00:36.695722Z","bundle_sha256":"55f88c1e16ea66d3b2ed597db130cdcc0ec2abfd56b052715165c21e25a0497d"}}