{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:PIEWMNYVFUHQWO3PGOE3G67ZP7","short_pith_number":"pith:PIEWMNYV","canonical_record":{"source":{"id":"1512.02396","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2015-12-08T10:46:27Z","cross_cats_sorted":["physics.atom-ph","physics.optics"],"title_canon_sha256":"63cf3746d92533b1d9e6c3efc1c3312ebe999b507ced7ea5ba486ecc735d2c53","abstract_canon_sha256":"e21da3c5db5b77e65fae4adf527c873ed06047b809116fc66c96a8f7457b3afb"},"schema_version":"1.0"},"canonical_sha256":"7a096637152d0f0b3b6f3389b37bf97fdfa8630f4857bf11597b3a39e4c36640","source":{"kind":"arxiv","id":"1512.02396","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1512.02396","created_at":"2026-05-18T01:23:28Z"},{"alias_kind":"arxiv_version","alias_value":"1512.02396v1","created_at":"2026-05-18T01:23:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1512.02396","created_at":"2026-05-18T01:23:28Z"},{"alias_kind":"pith_short_12","alias_value":"PIEWMNYVFUHQ","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_16","alias_value":"PIEWMNYVFUHQWO3P","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_8","alias_value":"PIEWMNYV","created_at":"2026-05-18T12:29:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:PIEWMNYVFUHQWO3PGOE3G67ZP7","target":"record","payload":{"canonical_record":{"source":{"id":"1512.02396","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2015-12-08T10:46:27Z","cross_cats_sorted":["physics.atom-ph","physics.optics"],"title_canon_sha256":"63cf3746d92533b1d9e6c3efc1c3312ebe999b507ced7ea5ba486ecc735d2c53","abstract_canon_sha256":"e21da3c5db5b77e65fae4adf527c873ed06047b809116fc66c96a8f7457b3afb"},"schema_version":"1.0"},"canonical_sha256":"7a096637152d0f0b3b6f3389b37bf97fdfa8630f4857bf11597b3a39e4c36640","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:23:28.635997Z","signature_b64":"4P1JiBXgPt9hfyM38liWfnIjnp0XTRpWXbG9J5WifGU3KVWv0EV9Hl8XNyjlVj6mgXOpON4xsWR9vJrdnqfUDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7a096637152d0f0b3b6f3389b37bf97fdfa8630f4857bf11597b3a39e4c36640","last_reissued_at":"2026-05-18T01:23:28.635232Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:23:28.635232Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1512.02396","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":"2026-05-18T01:23:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"iU+By/W4oNFlUtk+3CF48WW+6NbCRNgsFsrznQSS0wUWZ2UCxcTs5iuF8SjO89MVl2MH9Kh4z5v6o/bIKUKZCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T09:08:35.251087Z"},"content_sha256":"e480a280a5d692e684aff7d2a4d5091a5751e9aebbc3b3ba458e984e901cd0d3","schema_version":"1.0","event_id":"sha256:e480a280a5d692e684aff7d2a4d5091a5751e9aebbc3b3ba458e984e901cd0d3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:PIEWMNYVFUHQWO3PGOE3G67ZP7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Ultra-low birefringence dodecagonal vacuum glass cell","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.atom-ph","physics.optics"],"primary_cat":"physics.ins-det","authors_text":"Andrea Alberti, Carsten Robens, Dieter Meschede, Geol Moon, Stefan Brakhane, Wolfgang Alt","submitted_at":"2015-12-08T10:46:27Z","abstract_excerpt":"We eport on an ultra-low birefringence dodecagonal glass cell for ultra-high vacuum applications. The epoxy-bonded trapezoidal windows of the cell are made of SF57 glass, which exhibits a very low stress-induced birefringence. We characterize the birefringence $\\Delta n$ of each window with the cell under vacuum conditions, obtaining values around $\\num{e-8}$. After baking the cell at $\\SI{150}{\\degreeCelsius}$, we reach a pressure below $\\SI{e-10}{\\milli \\bar}$. In addition, each window is antireflection coated on both sides, which is highly desirable for quantum optics experiments and precis"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1512.02396","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":"2026-05-18T01:23:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NJtgQ2NOowVKGu7SJzXizeeNaeCJKB9f8wfqWVgCl8dOSkm3WWGr97Yd0z0h/wK33jZazsuFpN+iYob8ICzCCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T09:08:35.251695Z"},"content_sha256":"95a9d0f08a92d5d9785a49a0334bdb09c9169a0d253da2c430bfb7263102f655","schema_version":"1.0","event_id":"sha256:95a9d0f08a92d5d9785a49a0334bdb09c9169a0d253da2c430bfb7263102f655"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PIEWMNYVFUHQWO3PGOE3G67ZP7/bundle.json","state_url":"https://pith.science/pith/PIEWMNYVFUHQWO3PGOE3G67ZP7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PIEWMNYVFUHQWO3PGOE3G67ZP7/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":"2026-05-28T09:08:35Z","links":{"resolver":"https://pith.science/pith/PIEWMNYVFUHQWO3PGOE3G67ZP7","bundle":"https://pith.science/pith/PIEWMNYVFUHQWO3PGOE3G67ZP7/bundle.json","state":"https://pith.science/pith/PIEWMNYVFUHQWO3PGOE3G67ZP7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PIEWMNYVFUHQWO3PGOE3G67ZP7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:PIEWMNYVFUHQWO3PGOE3G67ZP7","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":"e21da3c5db5b77e65fae4adf527c873ed06047b809116fc66c96a8f7457b3afb","cross_cats_sorted":["physics.atom-ph","physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2015-12-08T10:46:27Z","title_canon_sha256":"63cf3746d92533b1d9e6c3efc1c3312ebe999b507ced7ea5ba486ecc735d2c53"},"schema_version":"1.0","source":{"id":"1512.02396","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1512.02396","created_at":"2026-05-18T01:23:28Z"},{"alias_kind":"arxiv_version","alias_value":"1512.02396v1","created_at":"2026-05-18T01:23:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1512.02396","created_at":"2026-05-18T01:23:28Z"},{"alias_kind":"pith_short_12","alias_value":"PIEWMNYVFUHQ","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_16","alias_value":"PIEWMNYVFUHQWO3P","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_8","alias_value":"PIEWMNYV","created_at":"2026-05-18T12:29:37Z"}],"graph_snapshots":[{"event_id":"sha256:95a9d0f08a92d5d9785a49a0334bdb09c9169a0d253da2c430bfb7263102f655","target":"graph","created_at":"2026-05-18T01:23:28Z","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 eport on an ultra-low birefringence dodecagonal glass cell for ultra-high vacuum applications. The epoxy-bonded trapezoidal windows of the cell are made of SF57 glass, which exhibits a very low stress-induced birefringence. We characterize the birefringence $\\Delta n$ of each window with the cell under vacuum conditions, obtaining values around $\\num{e-8}$. After baking the cell at $\\SI{150}{\\degreeCelsius}$, we reach a pressure below $\\SI{e-10}{\\milli \\bar}$. In addition, each window is antireflection coated on both sides, which is highly desirable for quantum optics experiments and precis","authors_text":"Andrea Alberti, Carsten Robens, Dieter Meschede, Geol Moon, Stefan Brakhane, Wolfgang Alt","cross_cats":["physics.atom-ph","physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2015-12-08T10:46:27Z","title":"Ultra-low birefringence dodecagonal vacuum glass cell"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1512.02396","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:e480a280a5d692e684aff7d2a4d5091a5751e9aebbc3b3ba458e984e901cd0d3","target":"record","created_at":"2026-05-18T01:23:28Z","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":"e21da3c5db5b77e65fae4adf527c873ed06047b809116fc66c96a8f7457b3afb","cross_cats_sorted":["physics.atom-ph","physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2015-12-08T10:46:27Z","title_canon_sha256":"63cf3746d92533b1d9e6c3efc1c3312ebe999b507ced7ea5ba486ecc735d2c53"},"schema_version":"1.0","source":{"id":"1512.02396","kind":"arxiv","version":1}},"canonical_sha256":"7a096637152d0f0b3b6f3389b37bf97fdfa8630f4857bf11597b3a39e4c36640","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7a096637152d0f0b3b6f3389b37bf97fdfa8630f4857bf11597b3a39e4c36640","first_computed_at":"2026-05-18T01:23:28.635232Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:23:28.635232Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4P1JiBXgPt9hfyM38liWfnIjnp0XTRpWXbG9J5WifGU3KVWv0EV9Hl8XNyjlVj6mgXOpON4xsWR9vJrdnqfUDw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:23:28.635997Z","signed_message":"canonical_sha256_bytes"},"source_id":"1512.02396","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e480a280a5d692e684aff7d2a4d5091a5751e9aebbc3b3ba458e984e901cd0d3","sha256:95a9d0f08a92d5d9785a49a0334bdb09c9169a0d253da2c430bfb7263102f655"],"state_sha256":"f7254e1d6908c0ea5a789cf5ae8766d75be51c10a7b37e90e0a6d9914c397c6c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"D2fWMS+Qj2dkJg+wl11L+ly6CiuzlnhlvuVnUqnFGf6CBC62qSWS4gBVhyycyPtTup7pvRamCTp0kzeT65ZiAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T09:08:35.254505Z","bundle_sha256":"54d071629f32cbebd0b062e4d33ca752a84eaeacc69d3b1c469f26a805569785"}}