{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:H6AIBMQQWPTBDHLUIUUUXMQNKZ","short_pith_number":"pith:H6AIBMQQ","canonical_record":{"source":{"id":"1812.05375","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2018-12-13T12:05:14Z","cross_cats_sorted":["cond-mat.mes-hall","quant-ph"],"title_canon_sha256":"4cb201f3725104b3d27c50857b110985ca6cc9dd1616f92b80c60e0d9c4c65f1","abstract_canon_sha256":"b7f36933e7f71f9659e4e678a57e1cf6482fdfbd01f281fee2eec7063f7c2add"},"schema_version":"1.0"},"canonical_sha256":"3f8080b210b3e6119d7445294bb20d567064d26c58e349cd4c5b049dc7469dd7","source":{"kind":"arxiv","id":"1812.05375","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1812.05375","created_at":"2026-05-17T23:48:55Z"},{"alias_kind":"arxiv_version","alias_value":"1812.05375v2","created_at":"2026-05-17T23:48:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1812.05375","created_at":"2026-05-17T23:48:55Z"},{"alias_kind":"pith_short_12","alias_value":"H6AIBMQQWPTB","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_16","alias_value":"H6AIBMQQWPTBDHLU","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_8","alias_value":"H6AIBMQQ","created_at":"2026-05-18T12:32:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:H6AIBMQQWPTBDHLUIUUUXMQNKZ","target":"record","payload":{"canonical_record":{"source":{"id":"1812.05375","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2018-12-13T12:05:14Z","cross_cats_sorted":["cond-mat.mes-hall","quant-ph"],"title_canon_sha256":"4cb201f3725104b3d27c50857b110985ca6cc9dd1616f92b80c60e0d9c4c65f1","abstract_canon_sha256":"b7f36933e7f71f9659e4e678a57e1cf6482fdfbd01f281fee2eec7063f7c2add"},"schema_version":"1.0"},"canonical_sha256":"3f8080b210b3e6119d7445294bb20d567064d26c58e349cd4c5b049dc7469dd7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:48:55.163250Z","signature_b64":"vKz+W05fE4Ceqtrgr3vQWy6baAwlc8wTN2BQbw5DBn6RbqZpUn3ZxY2JPwWs6uwYYS8APNoFho38nba4hPIRAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3f8080b210b3e6119d7445294bb20d567064d26c58e349cd4c5b049dc7469dd7","last_reissued_at":"2026-05-17T23:48:55.162808Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:48:55.162808Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1812.05375","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":"2026-05-17T23:48:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"h8xuoo75iC/bp0j+Kw75p+8UMlPkO7ur5aSejUGa5l3VvaDZ4K6iHQR7zNbq7sltpDZOUymaYfrz25WCozNWBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T19:41:22.183533Z"},"content_sha256":"a425e223c0d6bd6c87fb86d0dc4043c30b217fa4e63af1a7f50644fffff917db","schema_version":"1.0","event_id":"sha256:a425e223c0d6bd6c87fb86d0dc4043c30b217fa4e63af1a7f50644fffff917db"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:H6AIBMQQWPTBDHLUIUUUXMQNKZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Determination of Chern numbers with a phase retrieval algorithm","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mes-hall","quant-ph"],"primary_cat":"cond-mat.quant-gas","authors_text":"Arkadiusz Kosior, Krzysztof Sacha, Tomasz Szo{\\l}dra","submitted_at":"2018-12-13T12:05:14Z","abstract_excerpt":"Ultracold atoms in optical lattices form a clean quantum simulator platform which can be utilized to examine topological phenomena and test exotic topological materials. Here we propose an experimental scheme to measure the Chern numbers of two-dimensional multiband topological insulators with bosonic atoms. We show how to extract the topological invariants out of a sequence of time-of-flight images by applying a phase retrieval algorithm to matter waves. We illustrate advantages of using bosonic atoms as well as efficiency and robustness of the method with two prominent examples: the Harper-H"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1812.05375","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":"2026-05-17T23:48:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lx2iXqpEhWDPZHxiOP9rPPMukMZqHe3Dj1rovYDqpcXxsIpPYTDwuBugo9PgpEGPxPLiq7HSwXPFcrN6FdTTCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T19:41:22.184192Z"},"content_sha256":"d6a3dbda0a91ad581c27033770e2cb246b924fc70a2c58d2f7a1167a8ffb43b2","schema_version":"1.0","event_id":"sha256:d6a3dbda0a91ad581c27033770e2cb246b924fc70a2c58d2f7a1167a8ffb43b2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/H6AIBMQQWPTBDHLUIUUUXMQNKZ/bundle.json","state_url":"https://pith.science/pith/H6AIBMQQWPTBDHLUIUUUXMQNKZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/H6AIBMQQWPTBDHLUIUUUXMQNKZ/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":"2026-05-26T19:41:22Z","links":{"resolver":"https://pith.science/pith/H6AIBMQQWPTBDHLUIUUUXMQNKZ","bundle":"https://pith.science/pith/H6AIBMQQWPTBDHLUIUUUXMQNKZ/bundle.json","state":"https://pith.science/pith/H6AIBMQQWPTBDHLUIUUUXMQNKZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/H6AIBMQQWPTBDHLUIUUUXMQNKZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:H6AIBMQQWPTBDHLUIUUUXMQNKZ","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":"b7f36933e7f71f9659e4e678a57e1cf6482fdfbd01f281fee2eec7063f7c2add","cross_cats_sorted":["cond-mat.mes-hall","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2018-12-13T12:05:14Z","title_canon_sha256":"4cb201f3725104b3d27c50857b110985ca6cc9dd1616f92b80c60e0d9c4c65f1"},"schema_version":"1.0","source":{"id":"1812.05375","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1812.05375","created_at":"2026-05-17T23:48:55Z"},{"alias_kind":"arxiv_version","alias_value":"1812.05375v2","created_at":"2026-05-17T23:48:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1812.05375","created_at":"2026-05-17T23:48:55Z"},{"alias_kind":"pith_short_12","alias_value":"H6AIBMQQWPTB","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_16","alias_value":"H6AIBMQQWPTBDHLU","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_8","alias_value":"H6AIBMQQ","created_at":"2026-05-18T12:32:28Z"}],"graph_snapshots":[{"event_id":"sha256:d6a3dbda0a91ad581c27033770e2cb246b924fc70a2c58d2f7a1167a8ffb43b2","target":"graph","created_at":"2026-05-17T23:48:55Z","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":"Ultracold atoms in optical lattices form a clean quantum simulator platform which can be utilized to examine topological phenomena and test exotic topological materials. Here we propose an experimental scheme to measure the Chern numbers of two-dimensional multiband topological insulators with bosonic atoms. We show how to extract the topological invariants out of a sequence of time-of-flight images by applying a phase retrieval algorithm to matter waves. We illustrate advantages of using bosonic atoms as well as efficiency and robustness of the method with two prominent examples: the Harper-H","authors_text":"Arkadiusz Kosior, Krzysztof Sacha, Tomasz Szo{\\l}dra","cross_cats":["cond-mat.mes-hall","quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2018-12-13T12:05:14Z","title":"Determination of Chern numbers with a phase retrieval algorithm"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1812.05375","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:a425e223c0d6bd6c87fb86d0dc4043c30b217fa4e63af1a7f50644fffff917db","target":"record","created_at":"2026-05-17T23:48:55Z","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":"b7f36933e7f71f9659e4e678a57e1cf6482fdfbd01f281fee2eec7063f7c2add","cross_cats_sorted":["cond-mat.mes-hall","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2018-12-13T12:05:14Z","title_canon_sha256":"4cb201f3725104b3d27c50857b110985ca6cc9dd1616f92b80c60e0d9c4c65f1"},"schema_version":"1.0","source":{"id":"1812.05375","kind":"arxiv","version":2}},"canonical_sha256":"3f8080b210b3e6119d7445294bb20d567064d26c58e349cd4c5b049dc7469dd7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3f8080b210b3e6119d7445294bb20d567064d26c58e349cd4c5b049dc7469dd7","first_computed_at":"2026-05-17T23:48:55.162808Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:48:55.162808Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"vKz+W05fE4Ceqtrgr3vQWy6baAwlc8wTN2BQbw5DBn6RbqZpUn3ZxY2JPwWs6uwYYS8APNoFho38nba4hPIRAw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:48:55.163250Z","signed_message":"canonical_sha256_bytes"},"source_id":"1812.05375","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a425e223c0d6bd6c87fb86d0dc4043c30b217fa4e63af1a7f50644fffff917db","sha256:d6a3dbda0a91ad581c27033770e2cb246b924fc70a2c58d2f7a1167a8ffb43b2"],"state_sha256":"1562361871260e52cd1bbc0cad57106f433ba3f76a8662a046a33538eb36d481"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"++EbaEPfgt3gNU7gzCnHl9noAu74SxC1MmWZ3i1TezEteGM1MniSF8k549c3dl74c8Ud12R+8ksOxfMDTZN/Bg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T19:41:22.187937Z","bundle_sha256":"835e76fdd1714eb37afe6cf9b979f39964f2176a0813d3308e1fb9f993edc96d"}}