{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:57CKL5QA7GFU46XPHFD5QYVNNH","short_pith_number":"pith:57CKL5QA","canonical_record":{"source":{"id":"1102.3562","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-02-17T11:18:20Z","cross_cats_sorted":["cond-mat.str-el"],"title_canon_sha256":"535313d335e6813c9cea0397d13806dec46120a9095ae077742825c03873d04f","abstract_canon_sha256":"6ad4f1ec55be77779279310e9256fb6834d6b4ae18db3621d5e8af9ea2f7a41d"},"schema_version":"1.0"},"canonical_sha256":"efc4a5f600f98b4e7aef3947d862ad69e5c11ba5c83dae4ca03ea3112011c6e5","source":{"kind":"arxiv","id":"1102.3562","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1102.3562","created_at":"2026-05-18T02:22:31Z"},{"alias_kind":"arxiv_version","alias_value":"1102.3562v2","created_at":"2026-05-18T02:22:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1102.3562","created_at":"2026-05-18T02:22:31Z"},{"alias_kind":"pith_short_12","alias_value":"57CKL5QA7GFU","created_at":"2026-05-18T12:26:20Z"},{"alias_kind":"pith_short_16","alias_value":"57CKL5QA7GFU46XP","created_at":"2026-05-18T12:26:20Z"},{"alias_kind":"pith_short_8","alias_value":"57CKL5QA","created_at":"2026-05-18T12:26:20Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:57CKL5QA7GFU46XPHFD5QYVNNH","target":"record","payload":{"canonical_record":{"source":{"id":"1102.3562","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-02-17T11:18:20Z","cross_cats_sorted":["cond-mat.str-el"],"title_canon_sha256":"535313d335e6813c9cea0397d13806dec46120a9095ae077742825c03873d04f","abstract_canon_sha256":"6ad4f1ec55be77779279310e9256fb6834d6b4ae18db3621d5e8af9ea2f7a41d"},"schema_version":"1.0"},"canonical_sha256":"efc4a5f600f98b4e7aef3947d862ad69e5c11ba5c83dae4ca03ea3112011c6e5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:22:31.505840Z","signature_b64":"gLiOi6VVBaG6G6fL4hgzZd0RzsdGHk4pNV4jMd57dP+EMetHfxY23y7giSAdR8YxrWHwR4KO+yMjYH8ahDJjDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"efc4a5f600f98b4e7aef3947d862ad69e5c11ba5c83dae4ca03ea3112011c6e5","last_reissued_at":"2026-05-18T02:22:31.505105Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:22:31.505105Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1102.3562","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:22:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qVJvPiBqPw80rWn5roB7Z+Afev9ulZ3IaT/8bcF64cjWXPBFHeX/PkFoVtOgJx5B4LhBmYsq6cMWaPT8CbZpCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T22:41:12.692361Z"},"content_sha256":"6feeb2df54a3b91bc7e8a246dd43ad17e0c0875c9a9c8e93fa524188aa360786","schema_version":"1.0","event_id":"sha256:6feeb2df54a3b91bc7e8a246dd43ad17e0c0875c9a9c8e93fa524188aa360786"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:57CKL5QA7GFU46XPHFD5QYVNNH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Stiffness in 1D Matrix Product States with periodic boundary conditions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.str-el"],"primary_cat":"quant-ph","authors_text":"Davide Rossini, Rosario Fazio, Vittorio Giovannetti","submitted_at":"2011-02-17T11:18:20Z","abstract_excerpt":"We discuss in details a modified variational matrix-product-state algorithm for periodic boundary conditions, based on a recent work by P. Pippan, S.R. White and H.G. Everts, Phys. Rev. B 81, 081103(R) (2010), which enables one to study large systems on a ring (composed of N ~ 10^2 sites). In particular, we introduce a couple of improvements that allow to enhance the algorithm in terms of stability and reliability. We employ such method to compute the stiffness of one-dimensional strongly correlated quantum lattice systems. The accuracy of our calculations is tested in the exactly solvable spi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1102.3562","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":""},"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":"2026-05-18T02:22:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9xk2td5iWBf+Vwmrq6nAgq4n7iEfT1OAgvQTW0hU5Vy/BiEz6QMbEVavJcgpwkFZSoLkYfE9o3a3bBHb40ldBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T22:41:12.693052Z"},"content_sha256":"7f4e76f400b1780e8acbb8be010593507480b1139456a029c5ac15bfdc474c3e","schema_version":"1.0","event_id":"sha256:7f4e76f400b1780e8acbb8be010593507480b1139456a029c5ac15bfdc474c3e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/57CKL5QA7GFU46XPHFD5QYVNNH/bundle.json","state_url":"https://pith.science/pith/57CKL5QA7GFU46XPHFD5QYVNNH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/57CKL5QA7GFU46XPHFD5QYVNNH/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":"2026-05-27T22:41:12Z","links":{"resolver":"https://pith.science/pith/57CKL5QA7GFU46XPHFD5QYVNNH","bundle":"https://pith.science/pith/57CKL5QA7GFU46XPHFD5QYVNNH/bundle.json","state":"https://pith.science/pith/57CKL5QA7GFU46XPHFD5QYVNNH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/57CKL5QA7GFU46XPHFD5QYVNNH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:57CKL5QA7GFU46XPHFD5QYVNNH","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":"6ad4f1ec55be77779279310e9256fb6834d6b4ae18db3621d5e8af9ea2f7a41d","cross_cats_sorted":["cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-02-17T11:18:20Z","title_canon_sha256":"535313d335e6813c9cea0397d13806dec46120a9095ae077742825c03873d04f"},"schema_version":"1.0","source":{"id":"1102.3562","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1102.3562","created_at":"2026-05-18T02:22:31Z"},{"alias_kind":"arxiv_version","alias_value":"1102.3562v2","created_at":"2026-05-18T02:22:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1102.3562","created_at":"2026-05-18T02:22:31Z"},{"alias_kind":"pith_short_12","alias_value":"57CKL5QA7GFU","created_at":"2026-05-18T12:26:20Z"},{"alias_kind":"pith_short_16","alias_value":"57CKL5QA7GFU46XP","created_at":"2026-05-18T12:26:20Z"},{"alias_kind":"pith_short_8","alias_value":"57CKL5QA","created_at":"2026-05-18T12:26:20Z"}],"graph_snapshots":[{"event_id":"sha256:7f4e76f400b1780e8acbb8be010593507480b1139456a029c5ac15bfdc474c3e","target":"graph","created_at":"2026-05-18T02:22:31Z","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 discuss in details a modified variational matrix-product-state algorithm for periodic boundary conditions, based on a recent work by P. Pippan, S.R. White and H.G. Everts, Phys. Rev. B 81, 081103(R) (2010), which enables one to study large systems on a ring (composed of N ~ 10^2 sites). In particular, we introduce a couple of improvements that allow to enhance the algorithm in terms of stability and reliability. We employ such method to compute the stiffness of one-dimensional strongly correlated quantum lattice systems. The accuracy of our calculations is tested in the exactly solvable spi","authors_text":"Davide Rossini, Rosario Fazio, Vittorio Giovannetti","cross_cats":["cond-mat.str-el"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-02-17T11:18:20Z","title":"Stiffness in 1D Matrix Product States with periodic boundary conditions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1102.3562","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":"sha256:6feeb2df54a3b91bc7e8a246dd43ad17e0c0875c9a9c8e93fa524188aa360786","target":"record","created_at":"2026-05-18T02:22:31Z","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":"6ad4f1ec55be77779279310e9256fb6834d6b4ae18db3621d5e8af9ea2f7a41d","cross_cats_sorted":["cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-02-17T11:18:20Z","title_canon_sha256":"535313d335e6813c9cea0397d13806dec46120a9095ae077742825c03873d04f"},"schema_version":"1.0","source":{"id":"1102.3562","kind":"arxiv","version":2}},"canonical_sha256":"efc4a5f600f98b4e7aef3947d862ad69e5c11ba5c83dae4ca03ea3112011c6e5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"efc4a5f600f98b4e7aef3947d862ad69e5c11ba5c83dae4ca03ea3112011c6e5","first_computed_at":"2026-05-18T02:22:31.505105Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:22:31.505105Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gLiOi6VVBaG6G6fL4hgzZd0RzsdGHk4pNV4jMd57dP+EMetHfxY23y7giSAdR8YxrWHwR4KO+yMjYH8ahDJjDA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:22:31.505840Z","signed_message":"canonical_sha256_bytes"},"source_id":"1102.3562","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6feeb2df54a3b91bc7e8a246dd43ad17e0c0875c9a9c8e93fa524188aa360786","sha256:7f4e76f400b1780e8acbb8be010593507480b1139456a029c5ac15bfdc474c3e"],"state_sha256":"c8fd4e0bf7cbb09a47233be655d8f01370129982d8f65ec0b341bf2ae2d154c7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5UHuVF/tBgIlc6CiOIIpEpvPQpmnfEF6NYlLrouVEnT91nH3/wvD6ZUyhLyzYqB1G/akMIehstsyHi482mrdCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T22:41:12.696712Z","bundle_sha256":"e294f2564e519205a47557604d9279605f88d6e97c78171d6e35f860ed21e429"}}