{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:Z3UTD6TLOI2KUA6WO3VMQSIELO","short_pith_number":"pith:Z3UTD6TL","canonical_record":{"source":{"id":"1504.08266","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2015-04-30T15:21:43Z","cross_cats_sorted":[],"title_canon_sha256":"a2b0e347f6a08c64d6cece1e3e2d02800b9d6b724fa700359aaf85f8c3bb5cb4","abstract_canon_sha256":"f8a69731ff7b6e44ecf49339b272b9a9ef9507058bb0231110b3ff369e71cd6b"},"schema_version":"1.0"},"canonical_sha256":"cee931fa6b7234aa03d676eac849045b8bcd1e52b21758a571f711ca0751178c","source":{"kind":"arxiv","id":"1504.08266","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1504.08266","created_at":"2026-05-18T00:55:58Z"},{"alias_kind":"arxiv_version","alias_value":"1504.08266v1","created_at":"2026-05-18T00:55:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1504.08266","created_at":"2026-05-18T00:55:58Z"},{"alias_kind":"pith_short_12","alias_value":"Z3UTD6TLOI2K","created_at":"2026-05-18T12:29:52Z"},{"alias_kind":"pith_short_16","alias_value":"Z3UTD6TLOI2KUA6W","created_at":"2026-05-18T12:29:52Z"},{"alias_kind":"pith_short_8","alias_value":"Z3UTD6TL","created_at":"2026-05-18T12:29:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:Z3UTD6TLOI2KUA6WO3VMQSIELO","target":"record","payload":{"canonical_record":{"source":{"id":"1504.08266","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2015-04-30T15:21:43Z","cross_cats_sorted":[],"title_canon_sha256":"a2b0e347f6a08c64d6cece1e3e2d02800b9d6b724fa700359aaf85f8c3bb5cb4","abstract_canon_sha256":"f8a69731ff7b6e44ecf49339b272b9a9ef9507058bb0231110b3ff369e71cd6b"},"schema_version":"1.0"},"canonical_sha256":"cee931fa6b7234aa03d676eac849045b8bcd1e52b21758a571f711ca0751178c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:55:58.560899Z","signature_b64":"4SzNII/tcStbq9T8svVRYP4ge/mpjJXKiasgEIbm9oXI9jfPCPXV6mGWZcJE1AqF1E5T3y8JPoO/lPNzRh5mAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cee931fa6b7234aa03d676eac849045b8bcd1e52b21758a571f711ca0751178c","last_reissued_at":"2026-05-18T00:55:58.560369Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:55:58.560369Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1504.08266","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":"2026-05-18T00:55:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XznAPxifHkXrahSzJMaP6LFDf57YKni589bYFHNPDVmVLIEndUI8UnMcpHn4OUOX53E716R3g3ISeLqs5FRQDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T00:40:03.330260Z"},"content_sha256":"f9e8d79446e789233d6a928a56a053b6fdb2ba39d62625dc4da73509a91349e6","schema_version":"1.0","event_id":"sha256:f9e8d79446e789233d6a928a56a053b6fdb2ba39d62625dc4da73509a91349e6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:Z3UTD6TLOI2KUA6WO3VMQSIELO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Readout for intersatellite laser interferometry: Measuring low frequency phase fluctuations of HF signals with microradian precision","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.ins-det","authors_text":"Anders Engaard, Christian Diekmann, Gerhard Heinzel, Ioury Bykov, Jens Reiche, Joachim Kullmann, Juan Jos\\'e Esteban Delgado, Karsten Danzmann, Martin Suess, Michael Tr\\\"obs, Nils Christopher Brause, Oliver Gerberding, Oliver Jennrich, Simon Barke, S{\\o}ren M{\\o}ller Pedersen, Thomas S. Schwarze, Torben Rasmussen, Torben Vendt Hansen, Zoran Sodnik","submitted_at":"2015-04-30T15:21:43Z","abstract_excerpt":"Precision phase readout of optical beat note signals is one of the core techniques required for intersatellite laser interferometry. Future space based gravitational wave detectors like eLISA require such a readout over a wide range of MHz frequencies, due to orbit induced Doppler shifts, with a precision in the order of $\\mu \\textrm{rad}/\\sqrt{\\textrm{Hz}}$ at frequencies between $0.1\\,\\textrm{mHz}$ and $1\\,\\textrm{Hz}$. In this paper, we present phase readout systems, so-called phasemeters, that are able to achieve such precisions and we discuss various means that have been employed to reduc"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1504.08266","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":"2026-05-18T00:55:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"inhUvFXkFb91MChFAAHesbviXBTmIJym08ZtY9NnMSTysXF1MVird4Pf8GycKhLwy4DN3UP7wTXdHdxIfmoJCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T00:40:03.330974Z"},"content_sha256":"4b201f17e114bc2933b507bb7d5371f425ce427a5ba1baf914dfeb267469e3a7","schema_version":"1.0","event_id":"sha256:4b201f17e114bc2933b507bb7d5371f425ce427a5ba1baf914dfeb267469e3a7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Z3UTD6TLOI2KUA6WO3VMQSIELO/bundle.json","state_url":"https://pith.science/pith/Z3UTD6TLOI2KUA6WO3VMQSIELO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Z3UTD6TLOI2KUA6WO3VMQSIELO/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":"2026-05-27T00:40:03Z","links":{"resolver":"https://pith.science/pith/Z3UTD6TLOI2KUA6WO3VMQSIELO","bundle":"https://pith.science/pith/Z3UTD6TLOI2KUA6WO3VMQSIELO/bundle.json","state":"https://pith.science/pith/Z3UTD6TLOI2KUA6WO3VMQSIELO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Z3UTD6TLOI2KUA6WO3VMQSIELO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:Z3UTD6TLOI2KUA6WO3VMQSIELO","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":"f8a69731ff7b6e44ecf49339b272b9a9ef9507058bb0231110b3ff369e71cd6b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2015-04-30T15:21:43Z","title_canon_sha256":"a2b0e347f6a08c64d6cece1e3e2d02800b9d6b724fa700359aaf85f8c3bb5cb4"},"schema_version":"1.0","source":{"id":"1504.08266","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1504.08266","created_at":"2026-05-18T00:55:58Z"},{"alias_kind":"arxiv_version","alias_value":"1504.08266v1","created_at":"2026-05-18T00:55:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1504.08266","created_at":"2026-05-18T00:55:58Z"},{"alias_kind":"pith_short_12","alias_value":"Z3UTD6TLOI2K","created_at":"2026-05-18T12:29:52Z"},{"alias_kind":"pith_short_16","alias_value":"Z3UTD6TLOI2KUA6W","created_at":"2026-05-18T12:29:52Z"},{"alias_kind":"pith_short_8","alias_value":"Z3UTD6TL","created_at":"2026-05-18T12:29:52Z"}],"graph_snapshots":[{"event_id":"sha256:4b201f17e114bc2933b507bb7d5371f425ce427a5ba1baf914dfeb267469e3a7","target":"graph","created_at":"2026-05-18T00:55:58Z","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":"Precision phase readout of optical beat note signals is one of the core techniques required for intersatellite laser interferometry. Future space based gravitational wave detectors like eLISA require such a readout over a wide range of MHz frequencies, due to orbit induced Doppler shifts, with a precision in the order of $\\mu \\textrm{rad}/\\sqrt{\\textrm{Hz}}$ at frequencies between $0.1\\,\\textrm{mHz}$ and $1\\,\\textrm{Hz}$. In this paper, we present phase readout systems, so-called phasemeters, that are able to achieve such precisions and we discuss various means that have been employed to reduc","authors_text":"Anders Engaard, Christian Diekmann, Gerhard Heinzel, Ioury Bykov, Jens Reiche, Joachim Kullmann, Juan Jos\\'e Esteban Delgado, Karsten Danzmann, Martin Suess, Michael Tr\\\"obs, Nils Christopher Brause, Oliver Gerberding, Oliver Jennrich, Simon Barke, S{\\o}ren M{\\o}ller Pedersen, Thomas S. Schwarze, Torben Rasmussen, Torben Vendt Hansen, Zoran Sodnik","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2015-04-30T15:21:43Z","title":"Readout for intersatellite laser interferometry: Measuring low frequency phase fluctuations of HF signals with microradian precision"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1504.08266","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:f9e8d79446e789233d6a928a56a053b6fdb2ba39d62625dc4da73509a91349e6","target":"record","created_at":"2026-05-18T00:55:58Z","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":"f8a69731ff7b6e44ecf49339b272b9a9ef9507058bb0231110b3ff369e71cd6b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2015-04-30T15:21:43Z","title_canon_sha256":"a2b0e347f6a08c64d6cece1e3e2d02800b9d6b724fa700359aaf85f8c3bb5cb4"},"schema_version":"1.0","source":{"id":"1504.08266","kind":"arxiv","version":1}},"canonical_sha256":"cee931fa6b7234aa03d676eac849045b8bcd1e52b21758a571f711ca0751178c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cee931fa6b7234aa03d676eac849045b8bcd1e52b21758a571f711ca0751178c","first_computed_at":"2026-05-18T00:55:58.560369Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:55:58.560369Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4SzNII/tcStbq9T8svVRYP4ge/mpjJXKiasgEIbm9oXI9jfPCPXV6mGWZcJE1AqF1E5T3y8JPoO/lPNzRh5mAw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:55:58.560899Z","signed_message":"canonical_sha256_bytes"},"source_id":"1504.08266","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f9e8d79446e789233d6a928a56a053b6fdb2ba39d62625dc4da73509a91349e6","sha256:4b201f17e114bc2933b507bb7d5371f425ce427a5ba1baf914dfeb267469e3a7"],"state_sha256":"30dc04317e55923e0e2a7ba016a4e9cabc3601baa9c5fe04387f0eeecaac14c2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"STVUOXW2GysPcGT1W1/klad1VHF00wBoyOuwBUanPIHyFXTMdQAbVNKfGtT2mA3hdiMxkDshDnUIwKNMzMb4Aw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T00:40:03.334901Z","bundle_sha256":"50be4dddae2ff9b5aabb7a0daa64b26f9c5beff5cfa572d1d8d081d6cc39015b"}}