{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2000:QWPBHQS3MYU5HPIFAY4IKA6LWB","short_pith_number":"pith:QWPBHQS3","schema_version":"1.0","canonical_sha256":"859e13c25b6629d3bd0506388503cbb056d93f0bac5114bf9eaf1f3792251253","source":{"kind":"arxiv","id":"quant-ph/0004029","version":2},"attestation_state":"computed","paper":{"title":"Quantum Codes for Controlling Coherent Evolution","license":"","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"David G. Cory, Timothy F. Havel, Yehuda Sharf","submitted_at":"2000-04-07T01:11:06Z","abstract_excerpt":"Control over spin dynamics has been obtained in NMR via coherent averaging, which is implemented through a sequence of RF pulses, and via quantum codes which can protect against incoherent evolution. Here, we discuss the design and implementation of quantum codes to protect against coherent evolution. A detailed example is given of a quantum code for protecting two data qubits from evolution under a weak coupling (Ising) term in the Hamiltonian, using an ``isolated'' ancilla which does not evolve on the experimental time scale. The code is realized in a three-spin system by liquid-state NMR sp"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"quant-ph/0004029","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"2000-04-07T01:11:06Z","cross_cats_sorted":[],"title_canon_sha256":"72c02ef69a4c44cc49c78b913ad95ae4211d900f964c466db54a971dfd77b3f2","abstract_canon_sha256":"88991d8ae9cb18a34cd10dbec29a78125c545ede387b736f86fc71555f254e31"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:22:19.920332Z","signature_b64":"kXPj+UuRuIo9sOqo1ky3QKICMKpzEIfaB2DaJB9whO1qcJBTEFHf7O9dJejhAzbqxxW8/u4BvfsqZ7O8b6umDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"859e13c25b6629d3bd0506388503cbb056d93f0bac5114bf9eaf1f3792251253","last_reissued_at":"2026-07-04T16:22:19.919965Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:22:19.919965Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Quantum Codes for Controlling Coherent Evolution","license":"","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"David G. Cory, Timothy F. Havel, Yehuda Sharf","submitted_at":"2000-04-07T01:11:06Z","abstract_excerpt":"Control over spin dynamics has been obtained in NMR via coherent averaging, which is implemented through a sequence of RF pulses, and via quantum codes which can protect against incoherent evolution. Here, we discuss the design and implementation of quantum codes to protect against coherent evolution. A detailed example is given of a quantum code for protecting two data qubits from evolution under a weak coupling (Ising) term in the Hamiltonian, using an ``isolated'' ancilla which does not evolve on the experimental time scale. The code is realized in a three-spin system by liquid-state NMR sp"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/0004029","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/quant-ph/0004029/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/0004029","created_at":"2026-07-04T16:22:19.920028+00:00"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/0004029v2","created_at":"2026-07-04T16:22:19.920028+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/0004029","created_at":"2026-07-04T16:22:19.920028+00:00"},{"alias_kind":"pith_short_12","alias_value":"QWPBHQS3MYU5","created_at":"2026-07-04T16:22:19.920028+00:00"},{"alias_kind":"pith_short_16","alias_value":"QWPBHQS3MYU5HPIF","created_at":"2026-07-04T16:22:19.920028+00:00"},{"alias_kind":"pith_short_8","alias_value":"QWPBHQS3","created_at":"2026-07-04T16:22:19.920028+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/QWPBHQS3MYU5HPIFAY4IKA6LWB","json":"https://pith.science/pith/QWPBHQS3MYU5HPIFAY4IKA6LWB.json","graph_json":"https://pith.science/api/pith-number/QWPBHQS3MYU5HPIFAY4IKA6LWB/graph.json","events_json":"https://pith.science/api/pith-number/QWPBHQS3MYU5HPIFAY4IKA6LWB/events.json","paper":"https://pith.science/paper/QWPBHQS3"},"agent_actions":{"view_html":"https://pith.science/pith/QWPBHQS3MYU5HPIFAY4IKA6LWB","download_json":"https://pith.science/pith/QWPBHQS3MYU5HPIFAY4IKA6LWB.json","view_paper":"https://pith.science/paper/QWPBHQS3","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=quant-ph/0004029&json=true","fetch_graph":"https://pith.science/api/pith-number/QWPBHQS3MYU5HPIFAY4IKA6LWB/graph.json","fetch_events":"https://pith.science/api/pith-number/QWPBHQS3MYU5HPIFAY4IKA6LWB/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/QWPBHQS3MYU5HPIFAY4IKA6LWB/action/timestamp_anchor","attest_storage":"https://pith.science/pith/QWPBHQS3MYU5HPIFAY4IKA6LWB/action/storage_attestation","attest_author":"https://pith.science/pith/QWPBHQS3MYU5HPIFAY4IKA6LWB/action/author_attestation","sign_citation":"https://pith.science/pith/QWPBHQS3MYU5HPIFAY4IKA6LWB/action/citation_signature","submit_replication":"https://pith.science/pith/QWPBHQS3MYU5HPIFAY4IKA6LWB/action/replication_record"}},"created_at":"2026-07-04T16:22:19.920028+00:00","updated_at":"2026-07-04T16:22:19.920028+00:00"}