{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:D2GYDVYU4MWURFGGR34QTOTZNJ","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":"c9cf02f3602d3f0a0607d8a1248e0577f263922314cacd341997fce8aa37c32e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-07-31T07:10:21Z","title_canon_sha256":"7f76e67e97603bb61e636a48b0777be0dcdf8177db48837274a40e4c4684d48c"},"schema_version":"1.0","source":{"id":"0807.4994","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0807.4994","created_at":"2026-07-04T17:12:03Z"},{"alias_kind":"arxiv_version","alias_value":"0807.4994v2","created_at":"2026-07-04T17:12:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0807.4994","created_at":"2026-07-04T17:12:03Z"},{"alias_kind":"pith_short_12","alias_value":"D2GYDVYU4MWU","created_at":"2026-07-04T17:12:03Z"},{"alias_kind":"pith_short_16","alias_value":"D2GYDVYU4MWURFGG","created_at":"2026-07-04T17:12:03Z"},{"alias_kind":"pith_short_8","alias_value":"D2GYDVYU","created_at":"2026-07-04T17:12:03Z"}],"graph_snapshots":[{"event_id":"sha256:57b6e1a974d8065c93c4d34cd77fc1143e796a2ae4aaec6d52f6029291c88b7a","target":"graph","created_at":"2026-07-04T17:12:03Z","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/0807.4994/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"A random access memory, or RAM, is a device that, when interrogated, returns the content of a memory location in a memory array. A quantum RAM, or qRAM, allows one to access superpositions of memory sites, which may contain either quantum or classical information. RAMs and qRAMs with n-bit addresses can access 2^n memory sites. Any design for a RAM or qRAM then requires O(2^n) two-bit logic gates. At first sight this requirement might seem to make large scale quantum versions of such devices impractical, due to the difficulty of constructing and operating coherent devices with large numbers of","authors_text":"Lorenzo Maccone, Seth Lloyd, Vittorio Giovannetti","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-07-31T07:10:21Z","title":"Architectures for a quantum random access memory"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0807.4994","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":"sha256:9d90e0f84eb28beaa8f323598e9dfbd61fa26ef2a9af8faaabcb78fd3ab7e291","target":"record","created_at":"2026-07-04T17:12:03Z","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":"c9cf02f3602d3f0a0607d8a1248e0577f263922314cacd341997fce8aa37c32e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-07-31T07:10:21Z","title_canon_sha256":"7f76e67e97603bb61e636a48b0777be0dcdf8177db48837274a40e4c4684d48c"},"schema_version":"1.0","source":{"id":"0807.4994","kind":"arxiv","version":2}},"canonical_sha256":"1e8d81d714e32d4894c68ef909ba796a796a2b4f5c6daee07727a29788d330b7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1e8d81d714e32d4894c68ef909ba796a796a2b4f5c6daee07727a29788d330b7","first_computed_at":"2026-07-04T17:12:03.742536Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T17:12:03.742536Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ieP0zIX0MI9BRdwYhpsEXF4LYEWGIc2g0Yc3St0I3ZAUaZFavrBU9KkRCHJd5XQjZV+HvnF8AwPGxsJvzAKlDg==","signature_status":"signed_v1","signed_at":"2026-07-04T17:12:03.743019Z","signed_message":"canonical_sha256_bytes"},"source_id":"0807.4994","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9d90e0f84eb28beaa8f323598e9dfbd61fa26ef2a9af8faaabcb78fd3ab7e291","sha256:57b6e1a974d8065c93c4d34cd77fc1143e796a2ae4aaec6d52f6029291c88b7a"],"state_sha256":"e91e898b54e195a2d36af99ce9227f50674316ebc68d78682b625b12165c4bdb"}