{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:FIZBEBDF4WERDPEO4CZYLKKNLH","short_pith_number":"pith:FIZBEBDF","canonical_record":{"source":{"id":"0808.2652","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2008-08-19T21:21:21Z","cross_cats_sorted":["cond-mat.other"],"title_canon_sha256":"e695f24592afa30f3c0a0a06bd3128736eed8d972a497807389c0ac3eb95eae7","abstract_canon_sha256":"5e98d24686592f24648254b7c5f9204c39d60e5ac68f9e93f2781d521ea1747a"},"schema_version":"1.0"},"canonical_sha256":"2a32120465e58911bc8ee0b385a94d59c69ad48c7ad940e765aa030bbb4f3ad1","source":{"kind":"arxiv","id":"0808.2652","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0808.2652","created_at":"2026-05-18T02:15:43Z"},{"alias_kind":"arxiv_version","alias_value":"0808.2652v3","created_at":"2026-05-18T02:15:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0808.2652","created_at":"2026-05-18T02:15:43Z"},{"alias_kind":"pith_short_12","alias_value":"FIZBEBDF4WER","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_16","alias_value":"FIZBEBDF4WERDPEO","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_8","alias_value":"FIZBEBDF","created_at":"2026-05-18T12:25:57Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:FIZBEBDF4WERDPEO4CZYLKKNLH","target":"record","payload":{"canonical_record":{"source":{"id":"0808.2652","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2008-08-19T21:21:21Z","cross_cats_sorted":["cond-mat.other"],"title_canon_sha256":"e695f24592afa30f3c0a0a06bd3128736eed8d972a497807389c0ac3eb95eae7","abstract_canon_sha256":"5e98d24686592f24648254b7c5f9204c39d60e5ac68f9e93f2781d521ea1747a"},"schema_version":"1.0"},"canonical_sha256":"2a32120465e58911bc8ee0b385a94d59c69ad48c7ad940e765aa030bbb4f3ad1","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:15:43.072704Z","signature_b64":"BatFJAldIhSK5YrH5Tfs9a/xuSiQ3viXk4U6U9xypfbbuXwFHzVm1sUO15UpCH5n43GIGoFZ68rzKhu18sl0Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2a32120465e58911bc8ee0b385a94d59c69ad48c7ad940e765aa030bbb4f3ad1","last_reissued_at":"2026-05-18T02:15:43.072069Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:15:43.072069Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0808.2652","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:15:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZrHv/ujb53XQFyQUNMnlc0yYshZ9fsare663BygdZnfoZ1B4OY/iiTyB/LTd1yYM4WYBAb9uIdHgVaaT3eBHCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T14:29:36.277411Z"},"content_sha256":"f9a5327402401a7e65f69233965784ba506021df4dddad26839860d9546f3390","schema_version":"1.0","event_id":"sha256:f9a5327402401a7e65f69233965784ba506021df4dddad26839860d9546f3390"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:FIZBEBDF4WERDPEO4CZYLKKNLH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Squeezing Out the Entropy of Fermions in Optical Lattices","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.other"],"primary_cat":"cond-mat.quant-gas","authors_text":"Qi Zhou, Tin-Lun Ho","submitted_at":"2008-08-19T21:21:21Z","abstract_excerpt":"At present, there is considerable interest in using atomic fermions in optical lattices to emulate the mathematical models that have been used to study strongly correlated electronic systems. Some of these models, such as the two dimensional fermion Hubbard model, are notoriously difficult to solve, and their key properties remain controversial despite decades of studies. It is hoped that the emulation experiments will shed light on some of these long standing problems. A successful emulation, however, requires reaching temperatures as low as $10^{-12}$K and beyond, with entropy per particle f"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0808.2652","kind":"arxiv","version":3},"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":"2026-05-18T02:15:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"83UxzzKAWYqMjEQQxbFCKJFdlKUW1/vZcA8R2RzaMN6A3WxsQc+ElcSJdcXVAO7k1R5M3rBVRF+Vmi0fRGqGDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T14:29:36.277924Z"},"content_sha256":"04876a3a614ac907d7ae98ce96bae5e2d52e0764201aeda49f96dfb661f6cc9d","schema_version":"1.0","event_id":"sha256:04876a3a614ac907d7ae98ce96bae5e2d52e0764201aeda49f96dfb661f6cc9d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FIZBEBDF4WERDPEO4CZYLKKNLH/bundle.json","state_url":"https://pith.science/pith/FIZBEBDF4WERDPEO4CZYLKKNLH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FIZBEBDF4WERDPEO4CZYLKKNLH/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":"2026-05-31T14:29:36Z","links":{"resolver":"https://pith.science/pith/FIZBEBDF4WERDPEO4CZYLKKNLH","bundle":"https://pith.science/pith/FIZBEBDF4WERDPEO4CZYLKKNLH/bundle.json","state":"https://pith.science/pith/FIZBEBDF4WERDPEO4CZYLKKNLH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FIZBEBDF4WERDPEO4CZYLKKNLH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:FIZBEBDF4WERDPEO4CZYLKKNLH","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":"5e98d24686592f24648254b7c5f9204c39d60e5ac68f9e93f2781d521ea1747a","cross_cats_sorted":["cond-mat.other"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2008-08-19T21:21:21Z","title_canon_sha256":"e695f24592afa30f3c0a0a06bd3128736eed8d972a497807389c0ac3eb95eae7"},"schema_version":"1.0","source":{"id":"0808.2652","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0808.2652","created_at":"2026-05-18T02:15:43Z"},{"alias_kind":"arxiv_version","alias_value":"0808.2652v3","created_at":"2026-05-18T02:15:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0808.2652","created_at":"2026-05-18T02:15:43Z"},{"alias_kind":"pith_short_12","alias_value":"FIZBEBDF4WER","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_16","alias_value":"FIZBEBDF4WERDPEO","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_8","alias_value":"FIZBEBDF","created_at":"2026-05-18T12:25:57Z"}],"graph_snapshots":[{"event_id":"sha256:04876a3a614ac907d7ae98ce96bae5e2d52e0764201aeda49f96dfb661f6cc9d","target":"graph","created_at":"2026-05-18T02:15:43Z","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":"At present, there is considerable interest in using atomic fermions in optical lattices to emulate the mathematical models that have been used to study strongly correlated electronic systems. Some of these models, such as the two dimensional fermion Hubbard model, are notoriously difficult to solve, and their key properties remain controversial despite decades of studies. It is hoped that the emulation experiments will shed light on some of these long standing problems. A successful emulation, however, requires reaching temperatures as low as $10^{-12}$K and beyond, with entropy per particle f","authors_text":"Qi Zhou, Tin-Lun Ho","cross_cats":["cond-mat.other"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2008-08-19T21:21:21Z","title":"Squeezing Out the Entropy of Fermions in Optical Lattices"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0808.2652","kind":"arxiv","version":3},"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:f9a5327402401a7e65f69233965784ba506021df4dddad26839860d9546f3390","target":"record","created_at":"2026-05-18T02:15:43Z","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":"5e98d24686592f24648254b7c5f9204c39d60e5ac68f9e93f2781d521ea1747a","cross_cats_sorted":["cond-mat.other"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2008-08-19T21:21:21Z","title_canon_sha256":"e695f24592afa30f3c0a0a06bd3128736eed8d972a497807389c0ac3eb95eae7"},"schema_version":"1.0","source":{"id":"0808.2652","kind":"arxiv","version":3}},"canonical_sha256":"2a32120465e58911bc8ee0b385a94d59c69ad48c7ad940e765aa030bbb4f3ad1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2a32120465e58911bc8ee0b385a94d59c69ad48c7ad940e765aa030bbb4f3ad1","first_computed_at":"2026-05-18T02:15:43.072069Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:15:43.072069Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"BatFJAldIhSK5YrH5Tfs9a/xuSiQ3viXk4U6U9xypfbbuXwFHzVm1sUO15UpCH5n43GIGoFZ68rzKhu18sl0Cg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:15:43.072704Z","signed_message":"canonical_sha256_bytes"},"source_id":"0808.2652","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f9a5327402401a7e65f69233965784ba506021df4dddad26839860d9546f3390","sha256:04876a3a614ac907d7ae98ce96bae5e2d52e0764201aeda49f96dfb661f6cc9d"],"state_sha256":"f89f28e5f0d556ccd70351fc36f38320ff270a681e6805a80413b3ebe911f1c1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hzJpVrl95nw0pmeUzLoBSZ/ODMhudljjsGu1HHc6OKoberuxzOJH6qZKr09gl+mD+Z/8+UMOM4OpbngfpHCcAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T14:29:36.282463Z","bundle_sha256":"00c689dd77645cc3e55d08f018e5d563c51a544ec4064369a33bd29d488ddf5d"}}