{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:E3PQYU3QEBI3P3FBBUCXQ7GFOD","short_pith_number":"pith:E3PQYU3Q","canonical_record":{"source":{"id":"1507.03370","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-07-13T09:44:29Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"a3b31dab48f72e07898c37db1f2bf329b909b7bf68a1915dd05e90f57b7904f3","abstract_canon_sha256":"ec37794294864c4f51db273d12f156cf11f59dd5b3b22daf7d7b4e81c2d6c3d7"},"schema_version":"1.0"},"canonical_sha256":"26df0c53702051b7eca10d05787cc570c4595fffda9b74a16bbfa948b967254f","source":{"kind":"arxiv","id":"1507.03370","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.03370","created_at":"2026-05-18T01:18:44Z"},{"alias_kind":"arxiv_version","alias_value":"1507.03370v1","created_at":"2026-05-18T01:18:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.03370","created_at":"2026-05-18T01:18:44Z"},{"alias_kind":"pith_short_12","alias_value":"E3PQYU3QEBI3","created_at":"2026-05-18T12:29:17Z"},{"alias_kind":"pith_short_16","alias_value":"E3PQYU3QEBI3P3FB","created_at":"2026-05-18T12:29:17Z"},{"alias_kind":"pith_short_8","alias_value":"E3PQYU3Q","created_at":"2026-05-18T12:29:17Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:E3PQYU3QEBI3P3FBBUCXQ7GFOD","target":"record","payload":{"canonical_record":{"source":{"id":"1507.03370","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-07-13T09:44:29Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"a3b31dab48f72e07898c37db1f2bf329b909b7bf68a1915dd05e90f57b7904f3","abstract_canon_sha256":"ec37794294864c4f51db273d12f156cf11f59dd5b3b22daf7d7b4e81c2d6c3d7"},"schema_version":"1.0"},"canonical_sha256":"26df0c53702051b7eca10d05787cc570c4595fffda9b74a16bbfa948b967254f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:18:44.229000Z","signature_b64":"huKPVDtK7gNhnhj5XxPYjORSAKORvXkPlz6enTPDa+u5TiI1CSmVElrtI0RdoOXbacV0jDh5tN/dw/xJf+OBDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"26df0c53702051b7eca10d05787cc570c4595fffda9b74a16bbfa948b967254f","last_reissued_at":"2026-05-18T01:18:44.228282Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:18:44.228282Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1507.03370","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":"2026-05-18T01:18:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PDiI5kLJsmTD1jQr/RugwNRQ7dB8/BE40tbEBfHEle7Kh7bqQ9f4wxxK+6JM3AMDIMGYaN5ol/qzz4yDy39HBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T08:10:21.298861Z"},"content_sha256":"38e3fba0c7d91ff3e87c643cb3d9b80b9020b8ee1cf8e64b0c413c4140788c2e","schema_version":"1.0","event_id":"sha256:38e3fba0c7d91ff3e87c643cb3d9b80b9020b8ee1cf8e64b0c413c4140788c2e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:E3PQYU3QEBI3P3FBBUCXQ7GFOD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A folded-sandwich polarization-entangled two-color photon pair source with large tuning capability for applications in hybrid quantum architectures","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.optics"],"primary_cat":"quant-ph","authors_text":"Andreas Ahlrichs, Chris M\\\"uller, Oliver Benson, Otto Dietz, Thomas Krei{\\ss}l, Tim Kroh, Ulrike Herzog","submitted_at":"2015-07-13T09:44:29Z","abstract_excerpt":"We demonstrate a two-color entangled pho ton pair source which can be adapted easily to a wide range of wavelengths combinations. A Fresnel rhomb as a geometrical quarter-wave plate and a versatile combination of compensation crystals are key components of the source. Entanglement of two photons at the Cs D1 line (894.3 nm) and at the telecom O-band (1313.1 nm) with a fidelity of $F = 0.753 \\pm 0.021$ is demonstrated and improvements of the setup are discussed."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.03370","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":"2026-05-18T01:18:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"q47TGLr9OgA6J1Law12gQeENmCkzimvwPmIH4VPaca37dZoS1Mt23gExaDWCCVKgfwd8GVBP1pXZxGCgk71mCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T08:10:21.299214Z"},"content_sha256":"97cbddb43fc6aaed9d51a763e630df77d6d3cab42522a4620c7e96a6e2901c45","schema_version":"1.0","event_id":"sha256:97cbddb43fc6aaed9d51a763e630df77d6d3cab42522a4620c7e96a6e2901c45"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/E3PQYU3QEBI3P3FBBUCXQ7GFOD/bundle.json","state_url":"https://pith.science/pith/E3PQYU3QEBI3P3FBBUCXQ7GFOD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/E3PQYU3QEBI3P3FBBUCXQ7GFOD/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":"2026-06-02T08:10:21Z","links":{"resolver":"https://pith.science/pith/E3PQYU3QEBI3P3FBBUCXQ7GFOD","bundle":"https://pith.science/pith/E3PQYU3QEBI3P3FBBUCXQ7GFOD/bundle.json","state":"https://pith.science/pith/E3PQYU3QEBI3P3FBBUCXQ7GFOD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/E3PQYU3QEBI3P3FBBUCXQ7GFOD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:E3PQYU3QEBI3P3FBBUCXQ7GFOD","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":"ec37794294864c4f51db273d12f156cf11f59dd5b3b22daf7d7b4e81c2d6c3d7","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-07-13T09:44:29Z","title_canon_sha256":"a3b31dab48f72e07898c37db1f2bf329b909b7bf68a1915dd05e90f57b7904f3"},"schema_version":"1.0","source":{"id":"1507.03370","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.03370","created_at":"2026-05-18T01:18:44Z"},{"alias_kind":"arxiv_version","alias_value":"1507.03370v1","created_at":"2026-05-18T01:18:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.03370","created_at":"2026-05-18T01:18:44Z"},{"alias_kind":"pith_short_12","alias_value":"E3PQYU3QEBI3","created_at":"2026-05-18T12:29:17Z"},{"alias_kind":"pith_short_16","alias_value":"E3PQYU3QEBI3P3FB","created_at":"2026-05-18T12:29:17Z"},{"alias_kind":"pith_short_8","alias_value":"E3PQYU3Q","created_at":"2026-05-18T12:29:17Z"}],"graph_snapshots":[{"event_id":"sha256:97cbddb43fc6aaed9d51a763e630df77d6d3cab42522a4620c7e96a6e2901c45","target":"graph","created_at":"2026-05-18T01:18:44Z","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 demonstrate a two-color entangled pho ton pair source which can be adapted easily to a wide range of wavelengths combinations. A Fresnel rhomb as a geometrical quarter-wave plate and a versatile combination of compensation crystals are key components of the source. Entanglement of two photons at the Cs D1 line (894.3 nm) and at the telecom O-band (1313.1 nm) with a fidelity of $F = 0.753 \\pm 0.021$ is demonstrated and improvements of the setup are discussed.","authors_text":"Andreas Ahlrichs, Chris M\\\"uller, Oliver Benson, Otto Dietz, Thomas Krei{\\ss}l, Tim Kroh, Ulrike Herzog","cross_cats":["physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-07-13T09:44:29Z","title":"A folded-sandwich polarization-entangled two-color photon pair source with large tuning capability for applications in hybrid quantum architectures"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.03370","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":"sha256:38e3fba0c7d91ff3e87c643cb3d9b80b9020b8ee1cf8e64b0c413c4140788c2e","target":"record","created_at":"2026-05-18T01:18:44Z","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":"ec37794294864c4f51db273d12f156cf11f59dd5b3b22daf7d7b4e81c2d6c3d7","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-07-13T09:44:29Z","title_canon_sha256":"a3b31dab48f72e07898c37db1f2bf329b909b7bf68a1915dd05e90f57b7904f3"},"schema_version":"1.0","source":{"id":"1507.03370","kind":"arxiv","version":1}},"canonical_sha256":"26df0c53702051b7eca10d05787cc570c4595fffda9b74a16bbfa948b967254f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"26df0c53702051b7eca10d05787cc570c4595fffda9b74a16bbfa948b967254f","first_computed_at":"2026-05-18T01:18:44.228282Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:18:44.228282Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"huKPVDtK7gNhnhj5XxPYjORSAKORvXkPlz6enTPDa+u5TiI1CSmVElrtI0RdoOXbacV0jDh5tN/dw/xJf+OBDA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:18:44.229000Z","signed_message":"canonical_sha256_bytes"},"source_id":"1507.03370","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:38e3fba0c7d91ff3e87c643cb3d9b80b9020b8ee1cf8e64b0c413c4140788c2e","sha256:97cbddb43fc6aaed9d51a763e630df77d6d3cab42522a4620c7e96a6e2901c45"],"state_sha256":"df2fecf422f6a9ef8bb580ef7ca7c0c17de0ae03ca2fc77bddba080f67c49f1c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"r0q5zwxr6cB+8XUUo+e8KaxuTsx4VqZbNXIJRM0g/5GMwyfC7WD0v+CIb0rOTmfDv3oYVHj2uP0fa3NMYbguDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T08:10:21.301245Z","bundle_sha256":"f55c30e953c93dd02c77680854d5d804aac6b203f93edb425312fee2ffeb6064"}}