{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:JKYXQMAGA55HPXCFSHGEJDGVI2","short_pith_number":"pith:JKYXQMAG","canonical_record":{"source":{"id":"1512.07374","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-12-23T07:39:01Z","cross_cats_sorted":[],"title_canon_sha256":"1d735bec67df2a4e3dd44d4d20a8a44e4bb9d1eb09ac84c8b8c62ff812469908","abstract_canon_sha256":"be475fe81f7175c942bfb71157cba332ba79de64d921ef982c4f6cb63b49ef8a"},"schema_version":"1.0"},"canonical_sha256":"4ab1783006077a77dc4591cc448cd546802932670f4ef099a42bbf0bfed80fbf","source":{"kind":"arxiv","id":"1512.07374","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1512.07374","created_at":"2026-05-18T00:33:53Z"},{"alias_kind":"arxiv_version","alias_value":"1512.07374v2","created_at":"2026-05-18T00:33:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1512.07374","created_at":"2026-05-18T00:33:53Z"},{"alias_kind":"pith_short_12","alias_value":"JKYXQMAGA55H","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_16","alias_value":"JKYXQMAGA55HPXCF","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_8","alias_value":"JKYXQMAG","created_at":"2026-05-18T12:29:27Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:JKYXQMAGA55HPXCFSHGEJDGVI2","target":"record","payload":{"canonical_record":{"source":{"id":"1512.07374","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-12-23T07:39:01Z","cross_cats_sorted":[],"title_canon_sha256":"1d735bec67df2a4e3dd44d4d20a8a44e4bb9d1eb09ac84c8b8c62ff812469908","abstract_canon_sha256":"be475fe81f7175c942bfb71157cba332ba79de64d921ef982c4f6cb63b49ef8a"},"schema_version":"1.0"},"canonical_sha256":"4ab1783006077a77dc4591cc448cd546802932670f4ef099a42bbf0bfed80fbf","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:33:53.435933Z","signature_b64":"YyIfKHRf+e2ouIvc1LM5wvQSAAiHpXkYY4zzo2ebICRz4Tza9YEzAcVl9tnkF3pL6XXfqEi9hqRNODpTPyLXCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4ab1783006077a77dc4591cc448cd546802932670f4ef099a42bbf0bfed80fbf","last_reissued_at":"2026-05-18T00:33:53.435353Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:33:53.435353Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1512.07374","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":"2026-05-18T00:33:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"t/puSUO/jiBGQ8pM/K9wb/x6bMMDWZbIyMzD88Dz4cMbOQ0ZNQiz04Tgmf1k+LSv+VU2ZgnNhg3mqjxj7XO8Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T01:54:35.039674Z"},"content_sha256":"58e575ec0f898e0ddb317ab1f3082636d55550d2f4795878eafa4c03d25ecd77","schema_version":"1.0","event_id":"sha256:58e575ec0f898e0ddb317ab1f3082636d55550d2f4795878eafa4c03d25ecd77"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:JKYXQMAGA55HPXCFSHGEJDGVI2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Ultra-low-noise room-temperature quantum memory for polarization qubits","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Bertus Jordaan, Connor Kupchak, Eden Figueroa, Mehdi Namazi, Reihaneh Shahrokhshahi","submitted_at":"2015-12-23T07:39:01Z","abstract_excerpt":"Here we show an ultra-low noise regime of operation in a simple quantum memory in warm Rb atomic vapor. By modelling the quantum dynamics of four-level room temperature atoms, we achieve fidelities >90% for single-photon level polarization qubits, clearly surpassing any classical strategy exploiting the non-unitary memory efficiency. This is the first time such important threshold has been crossed with a room temperature device. Additionally we also show novel experimental techniques capable of producing fidelities close to unity. Our results demonstrate the potential of simple, resource-moder"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1512.07374","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":"2026-05-18T00:33:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"n5CesL7pjl1YGeXF5nGaG9QObcFqyiwapg/wN0F9F70x5ShlQmQSvrroHHYSjXTVSADal93WmLY3GXgRn3oNDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T01:54:35.040310Z"},"content_sha256":"ebfa011b727e9ad948ba3e802bf6686845521b43df4b57aa88c0cd4465dd1849","schema_version":"1.0","event_id":"sha256:ebfa011b727e9ad948ba3e802bf6686845521b43df4b57aa88c0cd4465dd1849"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JKYXQMAGA55HPXCFSHGEJDGVI2/bundle.json","state_url":"https://pith.science/pith/JKYXQMAGA55HPXCFSHGEJDGVI2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JKYXQMAGA55HPXCFSHGEJDGVI2/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":"2026-05-19T01:54:35Z","links":{"resolver":"https://pith.science/pith/JKYXQMAGA55HPXCFSHGEJDGVI2","bundle":"https://pith.science/pith/JKYXQMAGA55HPXCFSHGEJDGVI2/bundle.json","state":"https://pith.science/pith/JKYXQMAGA55HPXCFSHGEJDGVI2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JKYXQMAGA55HPXCFSHGEJDGVI2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:JKYXQMAGA55HPXCFSHGEJDGVI2","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":"be475fe81f7175c942bfb71157cba332ba79de64d921ef982c4f6cb63b49ef8a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-12-23T07:39:01Z","title_canon_sha256":"1d735bec67df2a4e3dd44d4d20a8a44e4bb9d1eb09ac84c8b8c62ff812469908"},"schema_version":"1.0","source":{"id":"1512.07374","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1512.07374","created_at":"2026-05-18T00:33:53Z"},{"alias_kind":"arxiv_version","alias_value":"1512.07374v2","created_at":"2026-05-18T00:33:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1512.07374","created_at":"2026-05-18T00:33:53Z"},{"alias_kind":"pith_short_12","alias_value":"JKYXQMAGA55H","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_16","alias_value":"JKYXQMAGA55HPXCF","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_8","alias_value":"JKYXQMAG","created_at":"2026-05-18T12:29:27Z"}],"graph_snapshots":[{"event_id":"sha256:ebfa011b727e9ad948ba3e802bf6686845521b43df4b57aa88c0cd4465dd1849","target":"graph","created_at":"2026-05-18T00:33:53Z","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":"Here we show an ultra-low noise regime of operation in a simple quantum memory in warm Rb atomic vapor. By modelling the quantum dynamics of four-level room temperature atoms, we achieve fidelities >90% for single-photon level polarization qubits, clearly surpassing any classical strategy exploiting the non-unitary memory efficiency. This is the first time such important threshold has been crossed with a room temperature device. Additionally we also show novel experimental techniques capable of producing fidelities close to unity. Our results demonstrate the potential of simple, resource-moder","authors_text":"Bertus Jordaan, Connor Kupchak, Eden Figueroa, Mehdi Namazi, Reihaneh Shahrokhshahi","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-12-23T07:39:01Z","title":"Ultra-low-noise room-temperature quantum memory for polarization qubits"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1512.07374","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":"sha256:58e575ec0f898e0ddb317ab1f3082636d55550d2f4795878eafa4c03d25ecd77","target":"record","created_at":"2026-05-18T00:33:53Z","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":"be475fe81f7175c942bfb71157cba332ba79de64d921ef982c4f6cb63b49ef8a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-12-23T07:39:01Z","title_canon_sha256":"1d735bec67df2a4e3dd44d4d20a8a44e4bb9d1eb09ac84c8b8c62ff812469908"},"schema_version":"1.0","source":{"id":"1512.07374","kind":"arxiv","version":2}},"canonical_sha256":"4ab1783006077a77dc4591cc448cd546802932670f4ef099a42bbf0bfed80fbf","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4ab1783006077a77dc4591cc448cd546802932670f4ef099a42bbf0bfed80fbf","first_computed_at":"2026-05-18T00:33:53.435353Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:33:53.435353Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"YyIfKHRf+e2ouIvc1LM5wvQSAAiHpXkYY4zzo2ebICRz4Tza9YEzAcVl9tnkF3pL6XXfqEi9hqRNODpTPyLXCw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:33:53.435933Z","signed_message":"canonical_sha256_bytes"},"source_id":"1512.07374","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:58e575ec0f898e0ddb317ab1f3082636d55550d2f4795878eafa4c03d25ecd77","sha256:ebfa011b727e9ad948ba3e802bf6686845521b43df4b57aa88c0cd4465dd1849"],"state_sha256":"6e046437b778db57a72e9a7b072101dca2bed31c023f549a121e12134015a952"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jS7OUcgJAQ9icdW/LttQpvIRuWqgFC2I3WX8/7CzWW0h+DeDyj9N13/EO25U0drc/FisEkC8++oMGD8vBNrzBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-19T01:54:35.042391Z","bundle_sha256":"2e367d8eb1844f41e1109881ce0a5f66f912067251ce7e45575d2213cfce79d0"}}