{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:Z5PMNSDJPHJMJ6GTJHNSA5DI3Y","short_pith_number":"pith:Z5PMNSDJ","canonical_record":{"source":{"id":"0903.3398","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-03-19T19:41:40Z","cross_cats_sorted":[],"title_canon_sha256":"8e85bd424c3ac566d92d16667f7ec4cf5756019ac40062e88bebfcd6326a0e91","abstract_canon_sha256":"c41766accfbaec78deb34c833a8d7637cf452cb57716154bc04b6e658976c67b"},"schema_version":"1.0"},"canonical_sha256":"cf5ec6c86979d2c4f8d349db207468de3b110895de7c0cfd96e12424564bcc69","source":{"kind":"arxiv","id":"0903.3398","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0903.3398","created_at":"2026-05-18T02:14:27Z"},{"alias_kind":"arxiv_version","alias_value":"0903.3398v1","created_at":"2026-05-18T02:14:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0903.3398","created_at":"2026-05-18T02:14:27Z"},{"alias_kind":"pith_short_12","alias_value":"Z5PMNSDJPHJM","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"Z5PMNSDJPHJMJ6GT","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"Z5PMNSDJ","created_at":"2026-05-18T12:26:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:Z5PMNSDJPHJMJ6GTJHNSA5DI3Y","target":"record","payload":{"canonical_record":{"source":{"id":"0903.3398","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-03-19T19:41:40Z","cross_cats_sorted":[],"title_canon_sha256":"8e85bd424c3ac566d92d16667f7ec4cf5756019ac40062e88bebfcd6326a0e91","abstract_canon_sha256":"c41766accfbaec78deb34c833a8d7637cf452cb57716154bc04b6e658976c67b"},"schema_version":"1.0"},"canonical_sha256":"cf5ec6c86979d2c4f8d349db207468de3b110895de7c0cfd96e12424564bcc69","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:14:27.224173Z","signature_b64":"ns1lG2HvvN3kOAwHkYIR4T14X6jjVPOEIh7wzysrsfrj5T1Irz0Dg29/sy/pxtiGwQH7bQ/ei7vsrR6QAvlNAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cf5ec6c86979d2c4f8d349db207468de3b110895de7c0cfd96e12424564bcc69","last_reissued_at":"2026-05-18T02:14:27.223452Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:14:27.223452Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0903.3398","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":"2026-05-18T02:14:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+SFBFRu37EClDY4NcB0knOodcTdKYfdwjdayYyJ2RSyvzLK2zvKeqYcWBjo7afTfpfkWCwLyQ648sehhZI5kCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T19:56:27.403721Z"},"content_sha256":"963d4cfab70a7ac1569f65ab59092fc5999e36e86d679331688d210ff616e87f","schema_version":"1.0","event_id":"sha256:963d4cfab70a7ac1569f65ab59092fc5999e36e86d679331688d210ff616e87f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:Z5PMNSDJPHJMJ6GTJHNSA5DI3Y","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Ultra--low noise differential AC-coupled photodetector for sensitive pulse detection applications","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"A. Boisen, E. S. Polzik, J. H. Mueller, M. Koschorreck, M. Kubasik, N. Kjaergaard, P. J. Windpassinger","submitted_at":"2009-03-19T19:41:40Z","abstract_excerpt":"We report on the performance of ultra low noise differential photodetectors especially designed for probing of atomic ensembles with weak light pulses. The working principle of the detectors is described together with the analysis procedures employed to extract the photon shot noise of light pulses with $\\sim1 \\mu$s duration. As opposed to frequency response peaked detectors, our approach allows for broadband quantum noise measurements. The equivalent noise charge (ENC) for two different hardware approaches is evaluated to 280 and 340 electrons per pulse, respectively which corresponds to a da"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0903.3398","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":"2026-05-18T02:14:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vhBzPVNrA8ZQwDowgtZpvRQf0tr8o0eIwZQrdzkg2zQK6qcCro6+irEbVSpu9PegPe6dIsrD8Yt4pTm43g26Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T19:56:27.404102Z"},"content_sha256":"91a589c86ff14b77135fab2e159b10aae27efd2217d3249a8cfe584928b3116d","schema_version":"1.0","event_id":"sha256:91a589c86ff14b77135fab2e159b10aae27efd2217d3249a8cfe584928b3116d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Z5PMNSDJPHJMJ6GTJHNSA5DI3Y/bundle.json","state_url":"https://pith.science/pith/Z5PMNSDJPHJMJ6GTJHNSA5DI3Y/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Z5PMNSDJPHJMJ6GTJHNSA5DI3Y/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":"2026-05-25T19:56:27Z","links":{"resolver":"https://pith.science/pith/Z5PMNSDJPHJMJ6GTJHNSA5DI3Y","bundle":"https://pith.science/pith/Z5PMNSDJPHJMJ6GTJHNSA5DI3Y/bundle.json","state":"https://pith.science/pith/Z5PMNSDJPHJMJ6GTJHNSA5DI3Y/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Z5PMNSDJPHJMJ6GTJHNSA5DI3Y/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:Z5PMNSDJPHJMJ6GTJHNSA5DI3Y","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":"c41766accfbaec78deb34c833a8d7637cf452cb57716154bc04b6e658976c67b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-03-19T19:41:40Z","title_canon_sha256":"8e85bd424c3ac566d92d16667f7ec4cf5756019ac40062e88bebfcd6326a0e91"},"schema_version":"1.0","source":{"id":"0903.3398","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0903.3398","created_at":"2026-05-18T02:14:27Z"},{"alias_kind":"arxiv_version","alias_value":"0903.3398v1","created_at":"2026-05-18T02:14:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0903.3398","created_at":"2026-05-18T02:14:27Z"},{"alias_kind":"pith_short_12","alias_value":"Z5PMNSDJPHJM","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"Z5PMNSDJPHJMJ6GT","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"Z5PMNSDJ","created_at":"2026-05-18T12:26:02Z"}],"graph_snapshots":[{"event_id":"sha256:91a589c86ff14b77135fab2e159b10aae27efd2217d3249a8cfe584928b3116d","target":"graph","created_at":"2026-05-18T02:14:27Z","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 report on the performance of ultra low noise differential photodetectors especially designed for probing of atomic ensembles with weak light pulses. The working principle of the detectors is described together with the analysis procedures employed to extract the photon shot noise of light pulses with $\\sim1 \\mu$s duration. As opposed to frequency response peaked detectors, our approach allows for broadband quantum noise measurements. The equivalent noise charge (ENC) for two different hardware approaches is evaluated to 280 and 340 electrons per pulse, respectively which corresponds to a da","authors_text":"A. Boisen, E. S. Polzik, J. H. Mueller, M. Koschorreck, M. Kubasik, N. Kjaergaard, P. J. Windpassinger","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-03-19T19:41:40Z","title":"Ultra--low noise differential AC-coupled photodetector for sensitive pulse detection applications"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0903.3398","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":"sha256:963d4cfab70a7ac1569f65ab59092fc5999e36e86d679331688d210ff616e87f","target":"record","created_at":"2026-05-18T02:14:27Z","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":"c41766accfbaec78deb34c833a8d7637cf452cb57716154bc04b6e658976c67b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-03-19T19:41:40Z","title_canon_sha256":"8e85bd424c3ac566d92d16667f7ec4cf5756019ac40062e88bebfcd6326a0e91"},"schema_version":"1.0","source":{"id":"0903.3398","kind":"arxiv","version":1}},"canonical_sha256":"cf5ec6c86979d2c4f8d349db207468de3b110895de7c0cfd96e12424564bcc69","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cf5ec6c86979d2c4f8d349db207468de3b110895de7c0cfd96e12424564bcc69","first_computed_at":"2026-05-18T02:14:27.223452Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:14:27.223452Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ns1lG2HvvN3kOAwHkYIR4T14X6jjVPOEIh7wzysrsfrj5T1Irz0Dg29/sy/pxtiGwQH7bQ/ei7vsrR6QAvlNAA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:14:27.224173Z","signed_message":"canonical_sha256_bytes"},"source_id":"0903.3398","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:963d4cfab70a7ac1569f65ab59092fc5999e36e86d679331688d210ff616e87f","sha256:91a589c86ff14b77135fab2e159b10aae27efd2217d3249a8cfe584928b3116d"],"state_sha256":"4d5a11ff23501574b90cd9222b67524646fc732be4133f675cd8983ed2cf1d76"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aGkRbqEJcKpgCqvCUKwOIGqBjCLAA/jPT+OVXw4NptXBQPufF9NGnf7gxll9RUa1xKlR3ogQQgZq8adpC2GYBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T19:56:27.407686Z","bundle_sha256":"1e98bec283516acd11b11dedf032535956423d729f22bded761db29a307a4dbd"}}