{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:DWP4FWGPFXFYF76YNTSLWHDVBB","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":"fa9b09e806076ce295866bc3066235edac60e2f6d031f13d604cadf372de4361","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-01-31T17:17:42Z","title_canon_sha256":"055fd9aca542c2cfac1c005c7f6d1292e1e4b6d081c79449e12be058fe0052fc"},"schema_version":"1.0","source":{"id":"1201.6625","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1201.6625","created_at":"2026-05-18T04:03:30Z"},{"alias_kind":"arxiv_version","alias_value":"1201.6625v1","created_at":"2026-05-18T04:03:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1201.6625","created_at":"2026-05-18T04:03:30Z"},{"alias_kind":"pith_short_12","alias_value":"DWP4FWGPFXFY","created_at":"2026-05-18T12:27:04Z"},{"alias_kind":"pith_short_16","alias_value":"DWP4FWGPFXFYF76Y","created_at":"2026-05-18T12:27:04Z"},{"alias_kind":"pith_short_8","alias_value":"DWP4FWGP","created_at":"2026-05-18T12:27:04Z"}],"graph_snapshots":[{"event_id":"sha256:7ce4cd36789057bf1493cb5dc2de822ca5c9a43bc3054ec3e95d0dd3ef730741","target":"graph","created_at":"2026-05-18T04:03:30Z","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":"We show how to optimally discriminate between K distinct quantum states, of which N copies are available, using one-at-a-time interactions with each of the N copies. While this task (famously) requires joint measurements on all N copies, we show that it can be solved with one-at-a-time \"coherent measurements\" performed by an apparatus with log(K) qubits of quantum memory. We apply the same technique to optimal discrimination between K distinct N-particle matrix product states of bond dimension D, using a coherent measurement apparatus with log(K) + log(D) qubits of memory.","authors_text":"Michael Zwolak, Robin Blume-Kohout, Sarah Croke","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-01-31T17:17:42Z","title":"Ideal state discrimination with an O(1)-qubit quantum computer"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1201.6625","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":"sha256:6e0e14a1c18185087df4ae7e0bd44e35559143de716d1b3726d69e6c06c1e14e","target":"record","created_at":"2026-05-18T04:03:30Z","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":"fa9b09e806076ce295866bc3066235edac60e2f6d031f13d604cadf372de4361","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-01-31T17:17:42Z","title_canon_sha256":"055fd9aca542c2cfac1c005c7f6d1292e1e4b6d081c79449e12be058fe0052fc"},"schema_version":"1.0","source":{"id":"1201.6625","kind":"arxiv","version":1}},"canonical_sha256":"1d9fc2d8cf2dcb82ffd86ce4bb1c7508407519933478a5234afcc63252927a16","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1d9fc2d8cf2dcb82ffd86ce4bb1c7508407519933478a5234afcc63252927a16","first_computed_at":"2026-05-18T04:03:30.001343Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:03:30.001343Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"uLRtkvpb/Zm5o+gbdUdI20t8BNDE+uDd6eGvYH+mkiVzVN004AEWhM7xp+JLUbNwSf0AoP+RuUZANr1bg1XCDA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:03:30.001839Z","signed_message":"canonical_sha256_bytes"},"source_id":"1201.6625","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6e0e14a1c18185087df4ae7e0bd44e35559143de716d1b3726d69e6c06c1e14e","sha256:7ce4cd36789057bf1493cb5dc2de822ca5c9a43bc3054ec3e95d0dd3ef730741"],"state_sha256":"cd434a63d681e19d12b817fa84ce4ddfec51c0a7fd7e8f2140ee20064d49b660"}