{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:PGTDV5XDJMROFRNWAOGY4KTDMU","short_pith_number":"pith:PGTDV5XD","canonical_record":{"source":{"id":"1911.08420","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-11-19T17:37:44Z","cross_cats_sorted":["cond-mat.mes-hall"],"title_canon_sha256":"e9f26580efb354aba6072febfcc46a41d632006848184465217ea738f275fb5d","abstract_canon_sha256":"f2064dcd863a7c859d0e6586ce8892f8f25a2089c6a480c5e93b9d001ac0a43b"},"schema_version":"1.0"},"canonical_sha256":"79a63af6e34b22e2c5b6038d8e2a63650420930247504f714b8efa7481dfad2b","source":{"kind":"arxiv","id":"1911.08420","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1911.08420","created_at":"2026-07-05T00:55:06Z"},{"alias_kind":"arxiv_version","alias_value":"1911.08420v1","created_at":"2026-07-05T00:55:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1911.08420","created_at":"2026-07-05T00:55:06Z"},{"alias_kind":"pith_short_12","alias_value":"PGTDV5XDJMRO","created_at":"2026-07-05T00:55:06Z"},{"alias_kind":"pith_short_16","alias_value":"PGTDV5XDJMROFRNW","created_at":"2026-07-05T00:55:06Z"},{"alias_kind":"pith_short_8","alias_value":"PGTDV5XD","created_at":"2026-07-05T00:55:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:PGTDV5XDJMROFRNWAOGY4KTDMU","target":"record","payload":{"canonical_record":{"source":{"id":"1911.08420","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-11-19T17:37:44Z","cross_cats_sorted":["cond-mat.mes-hall"],"title_canon_sha256":"e9f26580efb354aba6072febfcc46a41d632006848184465217ea738f275fb5d","abstract_canon_sha256":"f2064dcd863a7c859d0e6586ce8892f8f25a2089c6a480c5e93b9d001ac0a43b"},"schema_version":"1.0"},"canonical_sha256":"79a63af6e34b22e2c5b6038d8e2a63650420930247504f714b8efa7481dfad2b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:55:06.207221Z","signature_b64":"be3j3RC8HX2qkOAdJd3ttVM7CSCeCzrzRNCWAfvDNNJGyy+h8Hv3P3fBoc7M8cR6774noKqldNxIvBOgN0EHAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"79a63af6e34b22e2c5b6038d8e2a63650420930247504f714b8efa7481dfad2b","last_reissued_at":"2026-07-05T00:55:06.206755Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:55:06.206755Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1911.08420","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":"2026-07-05T00:55:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xX7iLRlwsm9/C0LDB6vtHEbcGvSi0D3DjYn9BDidMC9GXT7pdwmhYAuKuN4gDa2W2GqTNEXzZaWBx8yIlO5+AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T19:55:42.594411Z"},"content_sha256":"63ea1e8f4bb30bcd5dc8979f46db8b718067c25c338f326ab64da5ca70433595","schema_version":"1.0","event_id":"sha256:63ea1e8f4bb30bcd5dc8979f46db8b718067c25c338f326ab64da5ca70433595"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:PGTDV5XDJMROFRNWAOGY4KTDMU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Repetitive quantum non-demolition measurement and soft decoding of a silicon spin qubit","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mes-hall"],"primary_cat":"quant-ph","authors_text":"Benjamin D'Anjou, Daniel R. Ward, Donald E. Savage, Lieven M. K. Vandersypen, Mark A. Eriksson, Mark Friesen, Max G. Lagally, Susan N. Coppersmith, Thomas F. Watson, William A. Coish, Xiao Xue","submitted_at":"2019-11-19T17:37:44Z","abstract_excerpt":"Quantum error correction is of crucial importance for fault-tolerant quantum computers. As an essential step towards the implementation of quantum error-correcting codes, quantum non-demolition (QND) measurements are needed to efficiently detect the state of a logical qubit without destroying it. Here we implement QND measurements in a Si/SiGe two-qubit system, with one qubit serving as the logical qubit and the other serving as the ancilla. Making use of a two-qubit controlled-rotation gate, the state of the logical qubit is mapped onto the ancilla, followed by a destructive readout of the an"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1911.08420","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1911.08420/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":"2026-07-05T00:55:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"T+byI8XqEReTV2JXt6cVYKUPSOv6msMXk5khL7/gaIRxMifYEItn3v2zst0ksFD1/Nz+F5xq1zGyHXQTmE8iCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T19:55:42.594721Z"},"content_sha256":"5febabbbd5805ae5c56bf88d135c1f7e7013493e0b710c1eb828f9c1efb5e1f0","schema_version":"1.0","event_id":"sha256:5febabbbd5805ae5c56bf88d135c1f7e7013493e0b710c1eb828f9c1efb5e1f0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PGTDV5XDJMROFRNWAOGY4KTDMU/bundle.json","state_url":"https://pith.science/pith/PGTDV5XDJMROFRNWAOGY4KTDMU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PGTDV5XDJMROFRNWAOGY4KTDMU/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":"2026-08-05T19:55:42Z","links":{"resolver":"https://pith.science/pith/PGTDV5XDJMROFRNWAOGY4KTDMU","bundle":"https://pith.science/pith/PGTDV5XDJMROFRNWAOGY4KTDMU/bundle.json","state":"https://pith.science/pith/PGTDV5XDJMROFRNWAOGY4KTDMU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PGTDV5XDJMROFRNWAOGY4KTDMU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:PGTDV5XDJMROFRNWAOGY4KTDMU","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":"f2064dcd863a7c859d0e6586ce8892f8f25a2089c6a480c5e93b9d001ac0a43b","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-11-19T17:37:44Z","title_canon_sha256":"e9f26580efb354aba6072febfcc46a41d632006848184465217ea738f275fb5d"},"schema_version":"1.0","source":{"id":"1911.08420","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1911.08420","created_at":"2026-07-05T00:55:06Z"},{"alias_kind":"arxiv_version","alias_value":"1911.08420v1","created_at":"2026-07-05T00:55:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1911.08420","created_at":"2026-07-05T00:55:06Z"},{"alias_kind":"pith_short_12","alias_value":"PGTDV5XDJMRO","created_at":"2026-07-05T00:55:06Z"},{"alias_kind":"pith_short_16","alias_value":"PGTDV5XDJMROFRNW","created_at":"2026-07-05T00:55:06Z"},{"alias_kind":"pith_short_8","alias_value":"PGTDV5XD","created_at":"2026-07-05T00:55:06Z"}],"graph_snapshots":[{"event_id":"sha256:5febabbbd5805ae5c56bf88d135c1f7e7013493e0b710c1eb828f9c1efb5e1f0","target":"graph","created_at":"2026-07-05T00:55:06Z","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/1911.08420/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Quantum error correction is of crucial importance for fault-tolerant quantum computers. As an essential step towards the implementation of quantum error-correcting codes, quantum non-demolition (QND) measurements are needed to efficiently detect the state of a logical qubit without destroying it. Here we implement QND measurements in a Si/SiGe two-qubit system, with one qubit serving as the logical qubit and the other serving as the ancilla. Making use of a two-qubit controlled-rotation gate, the state of the logical qubit is mapped onto the ancilla, followed by a destructive readout of the an","authors_text":"Benjamin D'Anjou, Daniel R. Ward, Donald E. Savage, Lieven M. K. Vandersypen, Mark A. Eriksson, Mark Friesen, Max G. Lagally, Susan N. Coppersmith, Thomas F. Watson, William A. Coish, Xiao Xue","cross_cats":["cond-mat.mes-hall"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-11-19T17:37:44Z","title":"Repetitive quantum non-demolition measurement and soft decoding of a silicon spin qubit"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1911.08420","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":"sha256:63ea1e8f4bb30bcd5dc8979f46db8b718067c25c338f326ab64da5ca70433595","target":"record","created_at":"2026-07-05T00:55:06Z","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":"f2064dcd863a7c859d0e6586ce8892f8f25a2089c6a480c5e93b9d001ac0a43b","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-11-19T17:37:44Z","title_canon_sha256":"e9f26580efb354aba6072febfcc46a41d632006848184465217ea738f275fb5d"},"schema_version":"1.0","source":{"id":"1911.08420","kind":"arxiv","version":1}},"canonical_sha256":"79a63af6e34b22e2c5b6038d8e2a63650420930247504f714b8efa7481dfad2b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"79a63af6e34b22e2c5b6038d8e2a63650420930247504f714b8efa7481dfad2b","first_computed_at":"2026-07-05T00:55:06.206755Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:55:06.206755Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"be3j3RC8HX2qkOAdJd3ttVM7CSCeCzrzRNCWAfvDNNJGyy+h8Hv3P3fBoc7M8cR6774noKqldNxIvBOgN0EHAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T00:55:06.207221Z","signed_message":"canonical_sha256_bytes"},"source_id":"1911.08420","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:63ea1e8f4bb30bcd5dc8979f46db8b718067c25c338f326ab64da5ca70433595","sha256:5febabbbd5805ae5c56bf88d135c1f7e7013493e0b710c1eb828f9c1efb5e1f0"],"state_sha256":"0949a3bba5960442a0a4df5215e5af5eac1ca418c1e3cbb49df1d90ab07d469f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4JFnqYx6jAAlvpdTllujC9ehag6XKuWRPuvTyeATRtyv0Uzgy0eY5a8DDn8vqxoI1XinibJwBaBYT/8pmTnbCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T19:55:42.597253Z","bundle_sha256":"48832b0e8d68490ea39678bea665a21960aa64971590e81077c8bf74503b3bc5"}}