{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:BDTLGHG3JVCDZKCMDLVQJXUJZV","short_pith_number":"pith:BDTLGHG3","canonical_record":{"source":{"id":"1302.0205","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-02-01T15:10:02Z","cross_cats_sorted":[],"title_canon_sha256":"03a038fe2bd6bc5a3032e326e753e6af26caba261d948615d5f0216b74ec813d","abstract_canon_sha256":"0e538c7617812945b1ad512cd4ae5001de35f04b179578a65587ba55e4a7d6f7"},"schema_version":"1.0"},"canonical_sha256":"08e6b31cdb4d443ca84c1aeb04de89cd615157e16edf77b6c5b60df89e6a1110","source":{"kind":"arxiv","id":"1302.0205","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1302.0205","created_at":"2026-05-18T03:18:40Z"},{"alias_kind":"arxiv_version","alias_value":"1302.0205v2","created_at":"2026-05-18T03:18:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1302.0205","created_at":"2026-05-18T03:18:40Z"},{"alias_kind":"pith_short_12","alias_value":"BDTLGHG3JVCD","created_at":"2026-05-18T12:27:38Z"},{"alias_kind":"pith_short_16","alias_value":"BDTLGHG3JVCDZKCM","created_at":"2026-05-18T12:27:38Z"},{"alias_kind":"pith_short_8","alias_value":"BDTLGHG3","created_at":"2026-05-18T12:27:38Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:BDTLGHG3JVCDZKCMDLVQJXUJZV","target":"record","payload":{"canonical_record":{"source":{"id":"1302.0205","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-02-01T15:10:02Z","cross_cats_sorted":[],"title_canon_sha256":"03a038fe2bd6bc5a3032e326e753e6af26caba261d948615d5f0216b74ec813d","abstract_canon_sha256":"0e538c7617812945b1ad512cd4ae5001de35f04b179578a65587ba55e4a7d6f7"},"schema_version":"1.0"},"canonical_sha256":"08e6b31cdb4d443ca84c1aeb04de89cd615157e16edf77b6c5b60df89e6a1110","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:18:40.177581Z","signature_b64":"w4jFzs44VMqQt4J0k5VEeiWMDJFQRDE8uFJzMNjyBkG/V26Qpg9QTmte9d3dhL7Lxwag1QmUD4qH9ap8BRPQAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"08e6b31cdb4d443ca84c1aeb04de89cd615157e16edf77b6c5b60df89e6a1110","last_reissued_at":"2026-05-18T03:18:40.177092Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:18:40.177092Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1302.0205","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:18:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UhqLlYl72ffltJmtET/MVPEFk5IHjhi4cqC8QPgbP6OLS9plnm+gytwkTFsf8Vf6q/3tPeLc56KWw66+Wr/lDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T22:33:40.530674Z"},"content_sha256":"9f96e86bb162f2d80e21b0134db7f3e2c770a5382df7d1eb7f50c54e0a65b601","schema_version":"1.0","event_id":"sha256:9f96e86bb162f2d80e21b0134db7f3e2c770a5382df7d1eb7f50c54e0a65b601"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:BDTLGHG3JVCDZKCMDLVQJXUJZV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Quantum probes to assess correlations in a composite system","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Andrea Smirne, Bassano Vacchini, Giorgio Anelli, Matteo G.A. Paris, Simone Cialdi","submitted_at":"2013-02-01T15:10:02Z","abstract_excerpt":"We suggest and demonstrate experimentally a strategy to obtain relevant information about a composite system by only performing measurements on a small and easily accessible part of it, which we call quantum probe. We show in particular how quantitative information about the angular correlations of couples of entangled photons generated by spontaneous parametric down conversion is accessed through the study of the trace distance between two polarization states evolved from different initial conditions. After estimating the optimal polarization states to be used as quantum probe, we provide a d"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.0205","kind":"arxiv","version":2},"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":"2026-05-18T03:18:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oiSmpftLg4CYd+8KwCAgdYraNkbNs8FGOMeMOwTU09a1PPbxOQGx1smLsE6aBumXLeoukVOZPEG9wERa1MHtAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T22:33:40.531284Z"},"content_sha256":"720415159afe8fe32fa1b8fdacb77ee6c283b0af3df2c3b79283c6b88c5150d2","schema_version":"1.0","event_id":"sha256:720415159afe8fe32fa1b8fdacb77ee6c283b0af3df2c3b79283c6b88c5150d2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BDTLGHG3JVCDZKCMDLVQJXUJZV/bundle.json","state_url":"https://pith.science/pith/BDTLGHG3JVCDZKCMDLVQJXUJZV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BDTLGHG3JVCDZKCMDLVQJXUJZV/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":"2026-05-25T22:33:40Z","links":{"resolver":"https://pith.science/pith/BDTLGHG3JVCDZKCMDLVQJXUJZV","bundle":"https://pith.science/pith/BDTLGHG3JVCDZKCMDLVQJXUJZV/bundle.json","state":"https://pith.science/pith/BDTLGHG3JVCDZKCMDLVQJXUJZV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BDTLGHG3JVCDZKCMDLVQJXUJZV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:BDTLGHG3JVCDZKCMDLVQJXUJZV","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":"0e538c7617812945b1ad512cd4ae5001de35f04b179578a65587ba55e4a7d6f7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-02-01T15:10:02Z","title_canon_sha256":"03a038fe2bd6bc5a3032e326e753e6af26caba261d948615d5f0216b74ec813d"},"schema_version":"1.0","source":{"id":"1302.0205","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1302.0205","created_at":"2026-05-18T03:18:40Z"},{"alias_kind":"arxiv_version","alias_value":"1302.0205v2","created_at":"2026-05-18T03:18:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1302.0205","created_at":"2026-05-18T03:18:40Z"},{"alias_kind":"pith_short_12","alias_value":"BDTLGHG3JVCD","created_at":"2026-05-18T12:27:38Z"},{"alias_kind":"pith_short_16","alias_value":"BDTLGHG3JVCDZKCM","created_at":"2026-05-18T12:27:38Z"},{"alias_kind":"pith_short_8","alias_value":"BDTLGHG3","created_at":"2026-05-18T12:27:38Z"}],"graph_snapshots":[{"event_id":"sha256:720415159afe8fe32fa1b8fdacb77ee6c283b0af3df2c3b79283c6b88c5150d2","target":"graph","created_at":"2026-05-18T03:18:40Z","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 suggest and demonstrate experimentally a strategy to obtain relevant information about a composite system by only performing measurements on a small and easily accessible part of it, which we call quantum probe. We show in particular how quantitative information about the angular correlations of couples of entangled photons generated by spontaneous parametric down conversion is accessed through the study of the trace distance between two polarization states evolved from different initial conditions. After estimating the optimal polarization states to be used as quantum probe, we provide a d","authors_text":"Andrea Smirne, Bassano Vacchini, Giorgio Anelli, Matteo G.A. Paris, Simone Cialdi","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-02-01T15:10:02Z","title":"Quantum probes to assess correlations in a composite system"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.0205","kind":"arxiv","version":2},"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":"sha256:9f96e86bb162f2d80e21b0134db7f3e2c770a5382df7d1eb7f50c54e0a65b601","target":"record","created_at":"2026-05-18T03:18:40Z","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":"0e538c7617812945b1ad512cd4ae5001de35f04b179578a65587ba55e4a7d6f7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-02-01T15:10:02Z","title_canon_sha256":"03a038fe2bd6bc5a3032e326e753e6af26caba261d948615d5f0216b74ec813d"},"schema_version":"1.0","source":{"id":"1302.0205","kind":"arxiv","version":2}},"canonical_sha256":"08e6b31cdb4d443ca84c1aeb04de89cd615157e16edf77b6c5b60df89e6a1110","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"08e6b31cdb4d443ca84c1aeb04de89cd615157e16edf77b6c5b60df89e6a1110","first_computed_at":"2026-05-18T03:18:40.177092Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:18:40.177092Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"w4jFzs44VMqQt4J0k5VEeiWMDJFQRDE8uFJzMNjyBkG/V26Qpg9QTmte9d3dhL7Lxwag1QmUD4qH9ap8BRPQAw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:18:40.177581Z","signed_message":"canonical_sha256_bytes"},"source_id":"1302.0205","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9f96e86bb162f2d80e21b0134db7f3e2c770a5382df7d1eb7f50c54e0a65b601","sha256:720415159afe8fe32fa1b8fdacb77ee6c283b0af3df2c3b79283c6b88c5150d2"],"state_sha256":"ae76c2443c607b62d9ed1a0c18dca9e5155d3206dd7454ebbe0ceaf1fc3f3d8e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bfaRbcZklNdXx53vN0YQfM58saE6YsvdU4ifRv5zpvIqWaTkvGOGAtsxU/7Gz8lT+37m5cg8NGEqoI9m7hJwAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T22:33:40.534821Z","bundle_sha256":"3ec31aff7d0870257d5fe400ff969b9d64a64730fc9513571660716965bd2935"}}