{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:NOZHTQQ5QKDNO2OUWBGDRDLZ7T","short_pith_number":"pith:NOZHTQQ5","canonical_record":{"source":{"id":"1701.03167","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-01-11T21:00:07Z","cross_cats_sorted":[],"title_canon_sha256":"4258a60db7350ed4d3c271cc50622b40d508206298cce3a87dc0f1209ad8bc7b","abstract_canon_sha256":"43ca72062185201ea23f006cb4f388e10ab1fa72e513b30b77362cf73c8dc64f"},"schema_version":"1.0"},"canonical_sha256":"6bb279c21d8286d769d4b04c388d79fce5a62c3d8618c84ed9d30b25d6bb93f0","source":{"kind":"arxiv","id":"1701.03167","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1701.03167","created_at":"2026-05-18T00:34:52Z"},{"alias_kind":"arxiv_version","alias_value":"1701.03167v1","created_at":"2026-05-18T00:34:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1701.03167","created_at":"2026-05-18T00:34:52Z"},{"alias_kind":"pith_short_12","alias_value":"NOZHTQQ5QKDN","created_at":"2026-05-18T12:31:34Z"},{"alias_kind":"pith_short_16","alias_value":"NOZHTQQ5QKDNO2OU","created_at":"2026-05-18T12:31:34Z"},{"alias_kind":"pith_short_8","alias_value":"NOZHTQQ5","created_at":"2026-05-18T12:31:34Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:NOZHTQQ5QKDNO2OUWBGDRDLZ7T","target":"record","payload":{"canonical_record":{"source":{"id":"1701.03167","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-01-11T21:00:07Z","cross_cats_sorted":[],"title_canon_sha256":"4258a60db7350ed4d3c271cc50622b40d508206298cce3a87dc0f1209ad8bc7b","abstract_canon_sha256":"43ca72062185201ea23f006cb4f388e10ab1fa72e513b30b77362cf73c8dc64f"},"schema_version":"1.0"},"canonical_sha256":"6bb279c21d8286d769d4b04c388d79fce5a62c3d8618c84ed9d30b25d6bb93f0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:34:52.079202Z","signature_b64":"CV+lNPHJQnolmboY1K46XU/D0Nsmcgh1rRnNMbAsi+CAiJSGor1S2Pd+slmi4y3Ddg7ua7qy+d5JqnqLDnq/AA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6bb279c21d8286d769d4b04c388d79fce5a62c3d8618c84ed9d30b25d6bb93f0","last_reissued_at":"2026-05-18T00:34:52.078567Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:34:52.078567Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1701.03167","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":"2026-05-18T00:34:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Lv2Ivu9ntv/UrgkumRGFkwi8KfWxlFVWZMpRCW86KLaCZxByASCUKDnALeualzZf5gLTUfO+i8jRsu9F1dnWAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-11T04:59:23.189085Z"},"content_sha256":"f3b154f44d430edec0c067a43f0a82212e7ef93ff4dff41eb148dd60b9ae571e","schema_version":"1.0","event_id":"sha256:f3b154f44d430edec0c067a43f0a82212e7ef93ff4dff41eb148dd60b9ae571e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:NOZHTQQ5QKDNO2OUWBGDRDLZ7T","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Exact sampling hardness of Ising spin models","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Alexey V. Gorshkov, Bill Fefferman, Michael Foss-Feig","submitted_at":"2017-01-11T21:00:07Z","abstract_excerpt":"We study the complexity of classically sampling from the output distribution of an Ising spin model, which can be implemented naturally in a variety of atomic, molecular, and optical systems. In particular, we construct a specific example of an Ising Hamiltonian that, after time evolution starting from a trivial initial state, produces a particular output configuration with probability very nearly proportional to the square of the permanent of a matrix with arbitrary integer entries. In a similar spirit to BosonSampling, the ability to sample classically from the probability distribution induc"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1701.03167","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":""},"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":"2026-05-18T00:34:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"q6Knu6PcG1h5lc8zQyY4CgkB+GPtfzhpedN/mVhDkpvs1xUUO/1SK13+NX6AGnHl0kEq3Fwczf7DJfbdW37dCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-11T04:59:23.189766Z"},"content_sha256":"516ceec5c2dd50a602d17702240cb870b275a73afcf4862f002b585b8c9d12e9","schema_version":"1.0","event_id":"sha256:516ceec5c2dd50a602d17702240cb870b275a73afcf4862f002b585b8c9d12e9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NOZHTQQ5QKDNO2OUWBGDRDLZ7T/bundle.json","state_url":"https://pith.science/pith/NOZHTQQ5QKDNO2OUWBGDRDLZ7T/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NOZHTQQ5QKDNO2OUWBGDRDLZ7T/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":"2026-06-11T04:59:23Z","links":{"resolver":"https://pith.science/pith/NOZHTQQ5QKDNO2OUWBGDRDLZ7T","bundle":"https://pith.science/pith/NOZHTQQ5QKDNO2OUWBGDRDLZ7T/bundle.json","state":"https://pith.science/pith/NOZHTQQ5QKDNO2OUWBGDRDLZ7T/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NOZHTQQ5QKDNO2OUWBGDRDLZ7T/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:NOZHTQQ5QKDNO2OUWBGDRDLZ7T","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":"43ca72062185201ea23f006cb4f388e10ab1fa72e513b30b77362cf73c8dc64f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-01-11T21:00:07Z","title_canon_sha256":"4258a60db7350ed4d3c271cc50622b40d508206298cce3a87dc0f1209ad8bc7b"},"schema_version":"1.0","source":{"id":"1701.03167","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1701.03167","created_at":"2026-05-18T00:34:52Z"},{"alias_kind":"arxiv_version","alias_value":"1701.03167v1","created_at":"2026-05-18T00:34:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1701.03167","created_at":"2026-05-18T00:34:52Z"},{"alias_kind":"pith_short_12","alias_value":"NOZHTQQ5QKDN","created_at":"2026-05-18T12:31:34Z"},{"alias_kind":"pith_short_16","alias_value":"NOZHTQQ5QKDNO2OU","created_at":"2026-05-18T12:31:34Z"},{"alias_kind":"pith_short_8","alias_value":"NOZHTQQ5","created_at":"2026-05-18T12:31:34Z"}],"graph_snapshots":[{"event_id":"sha256:516ceec5c2dd50a602d17702240cb870b275a73afcf4862f002b585b8c9d12e9","target":"graph","created_at":"2026-05-18T00:34:52Z","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 study the complexity of classically sampling from the output distribution of an Ising spin model, which can be implemented naturally in a variety of atomic, molecular, and optical systems. In particular, we construct a specific example of an Ising Hamiltonian that, after time evolution starting from a trivial initial state, produces a particular output configuration with probability very nearly proportional to the square of the permanent of a matrix with arbitrary integer entries. In a similar spirit to BosonSampling, the ability to sample classically from the probability distribution induc","authors_text":"Alexey V. Gorshkov, Bill Fefferman, Michael Foss-Feig","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-01-11T21:00:07Z","title":"Exact sampling hardness of Ising spin models"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1701.03167","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:f3b154f44d430edec0c067a43f0a82212e7ef93ff4dff41eb148dd60b9ae571e","target":"record","created_at":"2026-05-18T00:34:52Z","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":"43ca72062185201ea23f006cb4f388e10ab1fa72e513b30b77362cf73c8dc64f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-01-11T21:00:07Z","title_canon_sha256":"4258a60db7350ed4d3c271cc50622b40d508206298cce3a87dc0f1209ad8bc7b"},"schema_version":"1.0","source":{"id":"1701.03167","kind":"arxiv","version":1}},"canonical_sha256":"6bb279c21d8286d769d4b04c388d79fce5a62c3d8618c84ed9d30b25d6bb93f0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6bb279c21d8286d769d4b04c388d79fce5a62c3d8618c84ed9d30b25d6bb93f0","first_computed_at":"2026-05-18T00:34:52.078567Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:34:52.078567Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"CV+lNPHJQnolmboY1K46XU/D0Nsmcgh1rRnNMbAsi+CAiJSGor1S2Pd+slmi4y3Ddg7ua7qy+d5JqnqLDnq/AA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:34:52.079202Z","signed_message":"canonical_sha256_bytes"},"source_id":"1701.03167","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f3b154f44d430edec0c067a43f0a82212e7ef93ff4dff41eb148dd60b9ae571e","sha256:516ceec5c2dd50a602d17702240cb870b275a73afcf4862f002b585b8c9d12e9"],"state_sha256":"2b6b3360ee64d19646d26850a29b74d49ce04cb5acc94e704a63a632ab6a4364"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uVX92X5/Tsz5NPYYduKjEzwwp+O54FGHRS+gZ8Gi2V/2RpdUCZUtgjb/mI8AzowA1+MWgpLjK5Aw5m6KcnW0Cg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-11T04:59:23.193578Z","bundle_sha256":"56ee1d6284c27cc6765c2b107bf79cb25241e688d698af7d18593b41d4b7e0d2"}}