{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:JS5M4AVNI37JOAYLCC5V7PSSKK","short_pith_number":"pith:JS5M4AVN","canonical_record":{"source":{"id":"1707.08154","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2017-07-12T08:30:24Z","cross_cats_sorted":["quant-ph"],"title_canon_sha256":"91daa6fa05f1b41b96e9064e54c754c980f9055057b1d719fc06ca796b23f227","abstract_canon_sha256":"375637eb11e93f4875cf740ac188bedc9afb7307027b5ed14548335612b1bfbe"},"schema_version":"1.0"},"canonical_sha256":"4cbace02ad46fe97030b10bb5fbe5252be79434bb8c839db3e4d912f378003d2","source":{"kind":"arxiv","id":"1707.08154","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1707.08154","created_at":"2026-05-18T00:39:25Z"},{"alias_kind":"arxiv_version","alias_value":"1707.08154v1","created_at":"2026-05-18T00:39:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1707.08154","created_at":"2026-05-18T00:39:25Z"},{"alias_kind":"pith_short_12","alias_value":"JS5M4AVNI37J","created_at":"2026-05-18T12:31:24Z"},{"alias_kind":"pith_short_16","alias_value":"JS5M4AVNI37JOAYL","created_at":"2026-05-18T12:31:24Z"},{"alias_kind":"pith_short_8","alias_value":"JS5M4AVN","created_at":"2026-05-18T12:31:24Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:JS5M4AVNI37JOAYLCC5V7PSSKK","target":"record","payload":{"canonical_record":{"source":{"id":"1707.08154","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2017-07-12T08:30:24Z","cross_cats_sorted":["quant-ph"],"title_canon_sha256":"91daa6fa05f1b41b96e9064e54c754c980f9055057b1d719fc06ca796b23f227","abstract_canon_sha256":"375637eb11e93f4875cf740ac188bedc9afb7307027b5ed14548335612b1bfbe"},"schema_version":"1.0"},"canonical_sha256":"4cbace02ad46fe97030b10bb5fbe5252be79434bb8c839db3e4d912f378003d2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:39:25.181222Z","signature_b64":"HumCCBltHoZwFKcoOIBjz3I0tiTJfGnfy9/QhGCdd9KoAgN69my27m5uVWDyutRok3F6iofkSyWNVCNxLd8QAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4cbace02ad46fe97030b10bb5fbe5252be79434bb8c839db3e4d912f378003d2","last_reissued_at":"2026-05-18T00:39:25.180584Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:39:25.180584Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1707.08154","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":"2026-05-18T00:39:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zqglXAshWGSIx2pEDN5ROkmwb/KXDTUYlts9w+mXEw1+AtQQnIi9jHg0x1b4iNvj697SuV4Vukt9D5ywhUmNDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T14:12:51.951529Z"},"content_sha256":"8f87dec9cb111acda1894cf931f60cb70e44063d38e0e5119da0bf8cf5b180f3","schema_version":"1.0","event_id":"sha256:8f87dec9cb111acda1894cf931f60cb70e44063d38e0e5119da0bf8cf5b180f3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:JS5M4AVNI37JOAYLCC5V7PSSKK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Satellite-to-ground quantum communication using a 50-kg-class micro-satellite","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["quant-ph"],"primary_cat":"physics.optics","authors_text":"Alberto Carrasco-Casado, Hideki Takenaka, Masahide Sasaki, Mikio Fujiwara, Mitsuo Kitamura, Morio Toyoshima","submitted_at":"2017-07-12T08:30:24Z","abstract_excerpt":"Recent rapid growth in the number of satellite-constellation programs for remote sensing and communications, thanks to the availability of small-size and low-cost satellites, provides impetus for high capacity laser communication (lasercom) in space. Quantum communication can enhance the overall performance of lasercom, and also enables intrinsically hack-proof secure communication known as Quantum Key Distribution (QKD). Here, we report a quantum communication experiment between a micro-satellite (48 kg and 50 cm cube) in a low earth orbit and a ground station with single-photon counters. Non"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1707.08154","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":"2026-05-18T00:39:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cDwuZO37HExDcqA1tkmgy+oOr2vg2qVY/trNEFuj1UyGXrAIxb50wIf7PVZ0ZmtA+xX0riV9RYQKNzy2md/WBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T14:12:51.951875Z"},"content_sha256":"ec2bf6bb1ade60d270246c0a2b3206da707edcfb258665651e6fbb408071a01c","schema_version":"1.0","event_id":"sha256:ec2bf6bb1ade60d270246c0a2b3206da707edcfb258665651e6fbb408071a01c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JS5M4AVNI37JOAYLCC5V7PSSKK/bundle.json","state_url":"https://pith.science/pith/JS5M4AVNI37JOAYLCC5V7PSSKK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JS5M4AVNI37JOAYLCC5V7PSSKK/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":"2026-06-08T14:12:51Z","links":{"resolver":"https://pith.science/pith/JS5M4AVNI37JOAYLCC5V7PSSKK","bundle":"https://pith.science/pith/JS5M4AVNI37JOAYLCC5V7PSSKK/bundle.json","state":"https://pith.science/pith/JS5M4AVNI37JOAYLCC5V7PSSKK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JS5M4AVNI37JOAYLCC5V7PSSKK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:JS5M4AVNI37JOAYLCC5V7PSSKK","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":"375637eb11e93f4875cf740ac188bedc9afb7307027b5ed14548335612b1bfbe","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2017-07-12T08:30:24Z","title_canon_sha256":"91daa6fa05f1b41b96e9064e54c754c980f9055057b1d719fc06ca796b23f227"},"schema_version":"1.0","source":{"id":"1707.08154","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1707.08154","created_at":"2026-05-18T00:39:25Z"},{"alias_kind":"arxiv_version","alias_value":"1707.08154v1","created_at":"2026-05-18T00:39:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1707.08154","created_at":"2026-05-18T00:39:25Z"},{"alias_kind":"pith_short_12","alias_value":"JS5M4AVNI37J","created_at":"2026-05-18T12:31:24Z"},{"alias_kind":"pith_short_16","alias_value":"JS5M4AVNI37JOAYL","created_at":"2026-05-18T12:31:24Z"},{"alias_kind":"pith_short_8","alias_value":"JS5M4AVN","created_at":"2026-05-18T12:31:24Z"}],"graph_snapshots":[{"event_id":"sha256:ec2bf6bb1ade60d270246c0a2b3206da707edcfb258665651e6fbb408071a01c","target":"graph","created_at":"2026-05-18T00:39:25Z","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":"Recent rapid growth in the number of satellite-constellation programs for remote sensing and communications, thanks to the availability of small-size and low-cost satellites, provides impetus for high capacity laser communication (lasercom) in space. Quantum communication can enhance the overall performance of lasercom, and also enables intrinsically hack-proof secure communication known as Quantum Key Distribution (QKD). Here, we report a quantum communication experiment between a micro-satellite (48 kg and 50 cm cube) in a low earth orbit and a ground station with single-photon counters. Non","authors_text":"Alberto Carrasco-Casado, Hideki Takenaka, Masahide Sasaki, Mikio Fujiwara, Mitsuo Kitamura, Morio Toyoshima","cross_cats":["quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2017-07-12T08:30:24Z","title":"Satellite-to-ground quantum communication using a 50-kg-class micro-satellite"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1707.08154","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":"sha256:8f87dec9cb111acda1894cf931f60cb70e44063d38e0e5119da0bf8cf5b180f3","target":"record","created_at":"2026-05-18T00:39:25Z","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":"375637eb11e93f4875cf740ac188bedc9afb7307027b5ed14548335612b1bfbe","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2017-07-12T08:30:24Z","title_canon_sha256":"91daa6fa05f1b41b96e9064e54c754c980f9055057b1d719fc06ca796b23f227"},"schema_version":"1.0","source":{"id":"1707.08154","kind":"arxiv","version":1}},"canonical_sha256":"4cbace02ad46fe97030b10bb5fbe5252be79434bb8c839db3e4d912f378003d2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4cbace02ad46fe97030b10bb5fbe5252be79434bb8c839db3e4d912f378003d2","first_computed_at":"2026-05-18T00:39:25.180584Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:39:25.180584Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"HumCCBltHoZwFKcoOIBjz3I0tiTJfGnfy9/QhGCdd9KoAgN69my27m5uVWDyutRok3F6iofkSyWNVCNxLd8QAA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:39:25.181222Z","signed_message":"canonical_sha256_bytes"},"source_id":"1707.08154","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8f87dec9cb111acda1894cf931f60cb70e44063d38e0e5119da0bf8cf5b180f3","sha256:ec2bf6bb1ade60d270246c0a2b3206da707edcfb258665651e6fbb408071a01c"],"state_sha256":"9e1ae85349a9e0a13ee58afb11a20dc039b52eaf3574a8e5511a50e2e2d7e3fa"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"it03+lMblF7MAqlr0xv+pNVryZkV8ZS9AgoaA3wa9WJtViI90dbIRofFckM5nCpPnAig5g6RaitqNNo0WjCQDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T14:12:51.953873Z","bundle_sha256":"49e2a892bf722ba2e6fd75d34fc090258c34a3ba131e3d38ab1c11a94c1b59d0"}}