{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:QFRQT5QGDBKGDCQD4SU42SM7N5","short_pith_number":"pith:QFRQT5QG","canonical_record":{"source":{"id":"1505.03264","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2015-05-13T07:40:19Z","cross_cats_sorted":["quant-ph"],"title_canon_sha256":"e08aaeee308f3f432cf5064034e8b6c676a1ba3185ced35170ffe41c3fd36758","abstract_canon_sha256":"ebb6d765b496ffad7da32d5c737a47a713387b68007005a5f68e60ad746d9aad"},"schema_version":"1.0"},"canonical_sha256":"816309f6061854618a03e4a9cd499f6f69a38fc7af53fc1026a36f2d98179323","source":{"kind":"arxiv","id":"1505.03264","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1505.03264","created_at":"2026-05-18T01:36:22Z"},{"alias_kind":"arxiv_version","alias_value":"1505.03264v2","created_at":"2026-05-18T01:36:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.03264","created_at":"2026-05-18T01:36:22Z"},{"alias_kind":"pith_short_12","alias_value":"QFRQT5QGDBKG","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_16","alias_value":"QFRQT5QGDBKGDCQD","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_8","alias_value":"QFRQT5QG","created_at":"2026-05-18T12:29:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:QFRQT5QGDBKGDCQD4SU42SM7N5","target":"record","payload":{"canonical_record":{"source":{"id":"1505.03264","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2015-05-13T07:40:19Z","cross_cats_sorted":["quant-ph"],"title_canon_sha256":"e08aaeee308f3f432cf5064034e8b6c676a1ba3185ced35170ffe41c3fd36758","abstract_canon_sha256":"ebb6d765b496ffad7da32d5c737a47a713387b68007005a5f68e60ad746d9aad"},"schema_version":"1.0"},"canonical_sha256":"816309f6061854618a03e4a9cd499f6f69a38fc7af53fc1026a36f2d98179323","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:36:22.815242Z","signature_b64":"1YKpEdPtSBFe/YBDHqrdIShLprdtLn/z3eqmTCqGSNO18rqdB6UqMqxQkytFpdFjdSU9A23/nvuaOf9Ruj/xDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"816309f6061854618a03e4a9cd499f6f69a38fc7af53fc1026a36f2d98179323","last_reissued_at":"2026-05-18T01:36:22.814524Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:36:22.814524Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1505.03264","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":"2026-05-18T01:36:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DBbYQyNb39ex+QzkE+V688CkstDqiRTez4bevWcAs24k2BRTn2965pKgro4TNa3lkLgxQwR4ID0sf4J70B6JDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T22:28:03.644008Z"},"content_sha256":"05ae6ba6e45ded7ef33895e0ff7dc1f2c3fb62633a391ead162c4e60e4c1a9bc","schema_version":"1.0","event_id":"sha256:05ae6ba6e45ded7ef33895e0ff7dc1f2c3fb62633a391ead162c4e60e4c1a9bc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:QFRQT5QGDBKGDCQD4SU42SM7N5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Unveiling hidden topological phases of a one-dimensional Hadamard quantum walk","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["quant-ph"],"primary_cat":"cond-mat.mes-hall","authors_text":"Hideaki Obuse, Janos K. Asboth, Norio Kawakami, Yuki Nishimura","submitted_at":"2015-05-13T07:40:19Z","abstract_excerpt":"Quantum walks, whose dynamics is prescribed by alternating unitary coin and shift operators, possess topological phases akin to those of Floquet topological insulators, driven by a time-periodic field. While there is ample theoretical work on topological phases of quantum walks where the coin operators are spin rotations, in experiments a different coin, the Hadamard operator is often used instead. This was the case in a recent photonic quantum walk experiment, where protected edge states were observed between two bulks whose topological invariants, as calculated by the standard theory, were t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.03264","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":"2026-05-18T01:36:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yj0BfI1/mod9xx3VjE7Mtp8ujGQoGSgvz5WGP88PVlUHQdluxMA9320K/3R3SLAyiTChk/Fw1uA4rK49DwoMAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T22:28:03.644606Z"},"content_sha256":"b5a5b3050a1e664c68e26a7c170b4de3284dd2d6577de5aba9315b58b26bee92","schema_version":"1.0","event_id":"sha256:b5a5b3050a1e664c68e26a7c170b4de3284dd2d6577de5aba9315b58b26bee92"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QFRQT5QGDBKGDCQD4SU42SM7N5/bundle.json","state_url":"https://pith.science/pith/QFRQT5QGDBKGDCQD4SU42SM7N5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QFRQT5QGDBKGDCQD4SU42SM7N5/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":"2026-06-04T22:28:03Z","links":{"resolver":"https://pith.science/pith/QFRQT5QGDBKGDCQD4SU42SM7N5","bundle":"https://pith.science/pith/QFRQT5QGDBKGDCQD4SU42SM7N5/bundle.json","state":"https://pith.science/pith/QFRQT5QGDBKGDCQD4SU42SM7N5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QFRQT5QGDBKGDCQD4SU42SM7N5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:QFRQT5QGDBKGDCQD4SU42SM7N5","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":"ebb6d765b496ffad7da32d5c737a47a713387b68007005a5f68e60ad746d9aad","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2015-05-13T07:40:19Z","title_canon_sha256":"e08aaeee308f3f432cf5064034e8b6c676a1ba3185ced35170ffe41c3fd36758"},"schema_version":"1.0","source":{"id":"1505.03264","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1505.03264","created_at":"2026-05-18T01:36:22Z"},{"alias_kind":"arxiv_version","alias_value":"1505.03264v2","created_at":"2026-05-18T01:36:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.03264","created_at":"2026-05-18T01:36:22Z"},{"alias_kind":"pith_short_12","alias_value":"QFRQT5QGDBKG","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_16","alias_value":"QFRQT5QGDBKGDCQD","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_8","alias_value":"QFRQT5QG","created_at":"2026-05-18T12:29:37Z"}],"graph_snapshots":[{"event_id":"sha256:b5a5b3050a1e664c68e26a7c170b4de3284dd2d6577de5aba9315b58b26bee92","target":"graph","created_at":"2026-05-18T01:36:22Z","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":"Quantum walks, whose dynamics is prescribed by alternating unitary coin and shift operators, possess topological phases akin to those of Floquet topological insulators, driven by a time-periodic field. While there is ample theoretical work on topological phases of quantum walks where the coin operators are spin rotations, in experiments a different coin, the Hadamard operator is often used instead. This was the case in a recent photonic quantum walk experiment, where protected edge states were observed between two bulks whose topological invariants, as calculated by the standard theory, were t","authors_text":"Hideaki Obuse, Janos K. Asboth, Norio Kawakami, Yuki Nishimura","cross_cats":["quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2015-05-13T07:40:19Z","title":"Unveiling hidden topological phases of a one-dimensional Hadamard quantum walk"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.03264","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":"sha256:05ae6ba6e45ded7ef33895e0ff7dc1f2c3fb62633a391ead162c4e60e4c1a9bc","target":"record","created_at":"2026-05-18T01:36:22Z","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":"ebb6d765b496ffad7da32d5c737a47a713387b68007005a5f68e60ad746d9aad","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2015-05-13T07:40:19Z","title_canon_sha256":"e08aaeee308f3f432cf5064034e8b6c676a1ba3185ced35170ffe41c3fd36758"},"schema_version":"1.0","source":{"id":"1505.03264","kind":"arxiv","version":2}},"canonical_sha256":"816309f6061854618a03e4a9cd499f6f69a38fc7af53fc1026a36f2d98179323","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"816309f6061854618a03e4a9cd499f6f69a38fc7af53fc1026a36f2d98179323","first_computed_at":"2026-05-18T01:36:22.814524Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:36:22.814524Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"1YKpEdPtSBFe/YBDHqrdIShLprdtLn/z3eqmTCqGSNO18rqdB6UqMqxQkytFpdFjdSU9A23/nvuaOf9Ruj/xDA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:36:22.815242Z","signed_message":"canonical_sha256_bytes"},"source_id":"1505.03264","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:05ae6ba6e45ded7ef33895e0ff7dc1f2c3fb62633a391ead162c4e60e4c1a9bc","sha256:b5a5b3050a1e664c68e26a7c170b4de3284dd2d6577de5aba9315b58b26bee92"],"state_sha256":"cd4165dc16d33be283f2cdf62ed770bbc2169e149080157dee57d7bbc374770e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"K7l6G5Ns6WqHAuR0kH7cIGszI1EhpjDoIV9NvCoQ/lxVkOeAIfQunJsDmYvnLN/CY18knJ5ZtaWXNdsSVIpECA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T22:28:03.647808Z","bundle_sha256":"12e019a1ae17ca3aee5f90bc149577ec32a7aa04e27bd493e62133fa423ae079"}}