{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:S6HM53Y25DVLCGTPNGBWGHHOBD","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":"09f6d7237ef8a2d43ff906f5b87e6dbaa7372ec0e59a0b6e9cbee923bf86cf35","cross_cats_sorted":["physics.optics","physics.space-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2024-12-19T15:24:11Z","title_canon_sha256":"174c2ed27c3f5ff93652ae9bec96aa23de75ea1b19557c21e70f853cc5dc2cf1"},"schema_version":"1.0","source":{"id":"2412.14944","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2412.14944","created_at":"2026-07-05T09:57:24Z"},{"alias_kind":"arxiv_version","alias_value":"2412.14944v1","created_at":"2026-07-05T09:57:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2412.14944","created_at":"2026-07-05T09:57:24Z"},{"alias_kind":"pith_short_12","alias_value":"S6HM53Y25DVL","created_at":"2026-07-05T09:57:24Z"},{"alias_kind":"pith_short_16","alias_value":"S6HM53Y25DVLCGTP","created_at":"2026-07-05T09:57:24Z"},{"alias_kind":"pith_short_8","alias_value":"S6HM53Y2","created_at":"2026-07-05T09:57:24Z"}],"graph_snapshots":[{"event_id":"sha256:41f817b7ac4058ea6d96f7df9e6cd8d081cf0b9c0345e3ff20e92eb94bbd3c85","target":"graph","created_at":"2026-07-05T09:57:24Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2412.14944/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Satellite to ground quantum communication typically operates at night to reduce background signals, however it remains susceptible to noise from light pollution of the night sky. In this study we compare several methodologies for determining whether a Quantum Ground Station (QGS) site is viable for exchanging quantum signals with the upcoming Quantum Encryption and Science Satellite (QEYSSat) mission. We conducted ground site characterization studies at three locations in Canada: Waterloo, Ontario, Calgary, Alberta, and Priddis, Alberta. Using different methods we estimate the background count","authors_text":"Daniel Oblak, Katanya B. Kuntz, Mathew Yastremski, Nouralhoda Bayat, Paul J. Godin, Sungeun Oh, Thomas Jennewein, Ziheng Chang","cross_cats":["physics.optics","physics.space-ph"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2024-12-19T15:24:11Z","title":"Estimating the impact of light pollution on quantum communication between QEYSSat and Canadian quantum ground station sites"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2412.14944","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":"sha256:9db4c07a14a8425134476fb5943268ad838e11d1072337df6911ee4175f95385","target":"record","created_at":"2026-07-05T09:57:24Z","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":"09f6d7237ef8a2d43ff906f5b87e6dbaa7372ec0e59a0b6e9cbee923bf86cf35","cross_cats_sorted":["physics.optics","physics.space-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2024-12-19T15:24:11Z","title_canon_sha256":"174c2ed27c3f5ff93652ae9bec96aa23de75ea1b19557c21e70f853cc5dc2cf1"},"schema_version":"1.0","source":{"id":"2412.14944","kind":"arxiv","version":1}},"canonical_sha256":"978eceef1ae8eab11a6f6983631cee08c5f9fe67cc3a1adc4bcfced4024d0e70","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"978eceef1ae8eab11a6f6983631cee08c5f9fe67cc3a1adc4bcfced4024d0e70","first_computed_at":"2026-07-05T09:57:24.454214Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T09:57:24.454214Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"VJ2PZqUUAKExQ7xDTmm/tzyR8iugSUzgS9bPQQbGnX8ynj395GSwqMxswslMxPTL8Mf1La5AJewRhDwTuHEkBw==","signature_status":"signed_v1","signed_at":"2026-07-05T09:57:24.454673Z","signed_message":"canonical_sha256_bytes"},"source_id":"2412.14944","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9db4c07a14a8425134476fb5943268ad838e11d1072337df6911ee4175f95385","sha256:41f817b7ac4058ea6d96f7df9e6cd8d081cf0b9c0345e3ff20e92eb94bbd3c85"],"state_sha256":"7fa579c236f2c87862c6cbf44acdf503e77151c4384977d3516d17d1cda27154"}