{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:CX77FFZYD2CKASNOS6XR5DRGKJ","short_pith_number":"pith:CX77FFZY","canonical_record":{"source":{"id":"2107.14473","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2021-07-30T07:56:04Z","cross_cats_sorted":[],"title_canon_sha256":"488ead050d7fef04c5bfd0482cf385de3b12fa3a579193b9e5a0f462fc81212a","abstract_canon_sha256":"f0a7535cd19c38d75e2963203e2188fa60e612769052fd3f92e386c79f365b0f"},"schema_version":"1.0"},"canonical_sha256":"15fff297381e84a049ae97af1e8e2652734a58e2a3665b9ae7773ce46ee406b3","source":{"kind":"arxiv","id":"2107.14473","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2107.14473","created_at":"2026-07-05T04:00:16Z"},{"alias_kind":"arxiv_version","alias_value":"2107.14473v1","created_at":"2026-07-05T04:00:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.14473","created_at":"2026-07-05T04:00:16Z"},{"alias_kind":"pith_short_12","alias_value":"CX77FFZYD2CK","created_at":"2026-07-05T04:00:16Z"},{"alias_kind":"pith_short_16","alias_value":"CX77FFZYD2CKASNO","created_at":"2026-07-05T04:00:16Z"},{"alias_kind":"pith_short_8","alias_value":"CX77FFZY","created_at":"2026-07-05T04:00:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:CX77FFZYD2CKASNOS6XR5DRGKJ","target":"record","payload":{"canonical_record":{"source":{"id":"2107.14473","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2021-07-30T07:56:04Z","cross_cats_sorted":[],"title_canon_sha256":"488ead050d7fef04c5bfd0482cf385de3b12fa3a579193b9e5a0f462fc81212a","abstract_canon_sha256":"f0a7535cd19c38d75e2963203e2188fa60e612769052fd3f92e386c79f365b0f"},"schema_version":"1.0"},"canonical_sha256":"15fff297381e84a049ae97af1e8e2652734a58e2a3665b9ae7773ce46ee406b3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:00:16.519949Z","signature_b64":"i8awKRjEWvXeK3p1xRI+P9hOszkfWLvFWKuD9hox1r3HFuzeY+A6spvObfFNlxulF4D5EnRb1IZ39gPkRfO3BQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"15fff297381e84a049ae97af1e8e2652734a58e2a3665b9ae7773ce46ee406b3","last_reissued_at":"2026-07-05T04:00:16.519536Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:00:16.519536Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2107.14473","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":"2026-07-05T04:00:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dBIDl3YAiUnx5ZKOK04vrFU71ZY0+WJdeiGfP02/wvdBTnGw/YYHYj5fbqE5ljmte1NbdCC2+8plZ9JSHIwyBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T09:09:39.571669Z"},"content_sha256":"fae553139f0efabb601b0ba2c81824bd4590a8c527c0f910e2d727f95a46ef0c","schema_version":"1.0","event_id":"sha256:fae553139f0efabb601b0ba2c81824bd4590a8c527c0f910e2d727f95a46ef0c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:CX77FFZYD2CKASNOS6XR5DRGKJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Fast Bayesian tomography of a two-qubit gate set in silicon","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"A. Saraiva, A. S. Dzurak, C. H. Yang, F. E. Hudson, J. Yoneda, K. M. Itoh, K. W. Chan, R. Harper, S. D. Bartlett, T. J. Evans, T. Tanttu, W. Huang","submitted_at":"2021-07-30T07:56:04Z","abstract_excerpt":"Benchmarking and characterising quantum states and logic gates is essential in the development of devices for quantum computing. We introduce a Bayesian approach to self-consistent process tomography, called fast Bayesian tomography (FBT), and experimentally demonstrate its performance in characterising a two-qubit gate set on a silicon-based spin qubit device. FBT is built on an adaptive self-consistent linearisation that is robust to model approximation errors. Our method offers several advantages over other self-consistent tomographic methods. Most notably, FBT can leverage prior informatio"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.14473","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/2107.14473/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":"2026-07-05T04:00:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+qAEjLLyu+bJunce2/Tj8k/EZVLznttTA/5TNADyL/5erNMqgpTJaMo27GPgpV3hW2YZNLJBK+skRShJAEowAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T09:09:39.572189Z"},"content_sha256":"6e542c3eb12ea622f9529496dbad56d3a8b4d377143aa5427799650d35e305fe","schema_version":"1.0","event_id":"sha256:6e542c3eb12ea622f9529496dbad56d3a8b4d377143aa5427799650d35e305fe"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CX77FFZYD2CKASNOS6XR5DRGKJ/bundle.json","state_url":"https://pith.science/pith/CX77FFZYD2CKASNOS6XR5DRGKJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CX77FFZYD2CKASNOS6XR5DRGKJ/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":"2026-08-04T09:09:39Z","links":{"resolver":"https://pith.science/pith/CX77FFZYD2CKASNOS6XR5DRGKJ","bundle":"https://pith.science/pith/CX77FFZYD2CKASNOS6XR5DRGKJ/bundle.json","state":"https://pith.science/pith/CX77FFZYD2CKASNOS6XR5DRGKJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CX77FFZYD2CKASNOS6XR5DRGKJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:CX77FFZYD2CKASNOS6XR5DRGKJ","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":"f0a7535cd19c38d75e2963203e2188fa60e612769052fd3f92e386c79f365b0f","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2021-07-30T07:56:04Z","title_canon_sha256":"488ead050d7fef04c5bfd0482cf385de3b12fa3a579193b9e5a0f462fc81212a"},"schema_version":"1.0","source":{"id":"2107.14473","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2107.14473","created_at":"2026-07-05T04:00:16Z"},{"alias_kind":"arxiv_version","alias_value":"2107.14473v1","created_at":"2026-07-05T04:00:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.14473","created_at":"2026-07-05T04:00:16Z"},{"alias_kind":"pith_short_12","alias_value":"CX77FFZYD2CK","created_at":"2026-07-05T04:00:16Z"},{"alias_kind":"pith_short_16","alias_value":"CX77FFZYD2CKASNO","created_at":"2026-07-05T04:00:16Z"},{"alias_kind":"pith_short_8","alias_value":"CX77FFZY","created_at":"2026-07-05T04:00:16Z"}],"graph_snapshots":[{"event_id":"sha256:6e542c3eb12ea622f9529496dbad56d3a8b4d377143aa5427799650d35e305fe","target":"graph","created_at":"2026-07-05T04:00:16Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2107.14473/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Benchmarking and characterising quantum states and logic gates is essential in the development of devices for quantum computing. We introduce a Bayesian approach to self-consistent process tomography, called fast Bayesian tomography (FBT), and experimentally demonstrate its performance in characterising a two-qubit gate set on a silicon-based spin qubit device. FBT is built on an adaptive self-consistent linearisation that is robust to model approximation errors. Our method offers several advantages over other self-consistent tomographic methods. Most notably, FBT can leverage prior informatio","authors_text":"A. Saraiva, A. S. Dzurak, C. H. Yang, F. E. Hudson, J. Yoneda, K. M. Itoh, K. W. Chan, R. Harper, S. D. Bartlett, T. J. Evans, T. Tanttu, W. Huang","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2021-07-30T07:56:04Z","title":"Fast Bayesian tomography of a two-qubit gate set in silicon"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.14473","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:fae553139f0efabb601b0ba2c81824bd4590a8c527c0f910e2d727f95a46ef0c","target":"record","created_at":"2026-07-05T04:00:16Z","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":"f0a7535cd19c38d75e2963203e2188fa60e612769052fd3f92e386c79f365b0f","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2021-07-30T07:56:04Z","title_canon_sha256":"488ead050d7fef04c5bfd0482cf385de3b12fa3a579193b9e5a0f462fc81212a"},"schema_version":"1.0","source":{"id":"2107.14473","kind":"arxiv","version":1}},"canonical_sha256":"15fff297381e84a049ae97af1e8e2652734a58e2a3665b9ae7773ce46ee406b3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"15fff297381e84a049ae97af1e8e2652734a58e2a3665b9ae7773ce46ee406b3","first_computed_at":"2026-07-05T04:00:16.519536Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:00:16.519536Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"i8awKRjEWvXeK3p1xRI+P9hOszkfWLvFWKuD9hox1r3HFuzeY+A6spvObfFNlxulF4D5EnRb1IZ39gPkRfO3BQ==","signature_status":"signed_v1","signed_at":"2026-07-05T04:00:16.519949Z","signed_message":"canonical_sha256_bytes"},"source_id":"2107.14473","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fae553139f0efabb601b0ba2c81824bd4590a8c527c0f910e2d727f95a46ef0c","sha256:6e542c3eb12ea622f9529496dbad56d3a8b4d377143aa5427799650d35e305fe"],"state_sha256":"89bde2f6d43c980b3855dd232cc218512160d6be65b98c9032ddf83c9770da48"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tsMeA6PlUTPiXDbZffrM6hrPDcRns2znwaCeOboKSkeJh00KJi/3jBOOKhaUi2tqBLvxan9s3wKbUUcHwjX3AQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T09:09:39.577402Z","bundle_sha256":"581ce98f7c3364d94274ac0d996688d3a4acd52346753dfc914ea8273f9a8a5e"}}