{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:F6TA7TRFIEI4D2YA3NEUXXPFAS","short_pith_number":"pith:F6TA7TRF","canonical_record":{"source":{"id":"1507.07814","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-07-28T15:36:01Z","cross_cats_sorted":[],"title_canon_sha256":"5e41e87ec201ea5ed4d9e5b018c7b2d28f1e3447f27108fcff4f3c3f2849fe50","abstract_canon_sha256":"20be50e915e1aee9d5d5bf1c5861ef34411548cf4fcdbd298eeb469c017f1593"},"schema_version":"1.0"},"canonical_sha256":"2fa60fce254111c1eb00db494bdde504a1deb1d7e9049e05f751f3967f57566d","source":{"kind":"arxiv","id":"1507.07814","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.07814","created_at":"2026-05-18T00:31:43Z"},{"alias_kind":"arxiv_version","alias_value":"1507.07814v1","created_at":"2026-05-18T00:31:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.07814","created_at":"2026-05-18T00:31:43Z"},{"alias_kind":"pith_short_12","alias_value":"F6TA7TRFIEI4","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_16","alias_value":"F6TA7TRFIEI4D2YA","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_8","alias_value":"F6TA7TRF","created_at":"2026-05-18T12:29:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:F6TA7TRFIEI4D2YA3NEUXXPFAS","target":"record","payload":{"canonical_record":{"source":{"id":"1507.07814","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-07-28T15:36:01Z","cross_cats_sorted":[],"title_canon_sha256":"5e41e87ec201ea5ed4d9e5b018c7b2d28f1e3447f27108fcff4f3c3f2849fe50","abstract_canon_sha256":"20be50e915e1aee9d5d5bf1c5861ef34411548cf4fcdbd298eeb469c017f1593"},"schema_version":"1.0"},"canonical_sha256":"2fa60fce254111c1eb00db494bdde504a1deb1d7e9049e05f751f3967f57566d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:31:43.981637Z","signature_b64":"87beleX88yyEkRAupJl8ursZsdIMjqUx0umpKunwaaaZEBfyZWLDvENjZevo+4eNd/pM36V+Gyv0kJjNoqD1BA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2fa60fce254111c1eb00db494bdde504a1deb1d7e9049e05f751f3967f57566d","last_reissued_at":"2026-05-18T00:31:43.981054Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:31:43.981054Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1507.07814","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":"2026-05-18T00:31:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aS4uqvHSU4i/zixZTHJUB48bf0se62ECE8sRifkhNtjTHei8rBHi6SA53by4MEzfasd6VTnoJZByfHhAi3c6BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T02:41:10.608976Z"},"content_sha256":"8bdf2d14512207536f0c8a9646cf800a200c7a8188fbc8fdbf17bbabb7123bae","schema_version":"1.0","event_id":"sha256:8bdf2d14512207536f0c8a9646cf800a200c7a8188fbc8fdbf17bbabb7123bae"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:F6TA7TRFIEI4D2YA3NEUXXPFAS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Quantum-enhanced multiparameter estimation in multiarm interferometers","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Augusto Smerzi, Chiara Vitelli, Fabio Sciarrino, Luca Pezz\\`e, Mario A. Ciampini, Nicol\\`o Spagnolo","submitted_at":"2015-07-28T15:36:01Z","abstract_excerpt":"Quantum metrology is the state-of-the-art measurement technology. It uses quantum resources to enhance the sensitivity of phase estimation beyond what reachable within classical physics. While single parameter estimation theory has been widely investigated, much less is known about the simultaneous estimation of multiple phases, which finds key applications in imaging and sensing. In this manuscript we provide conditions of useful entanglement (among multimode particles, qudits) for multiphase estimation and adapt them to multiarm Mach-Zehnder interferometry. We discuss benchmark multimode Foc"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.07814","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":"2026-05-18T00:31:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WUUE6DpLlETgi7d0/VdxPbVvTR7sLZoGCXmXCXR7KAkiJxFKoGRxPOtEY4KZeAWJVRQlf2mQSn27A3haHI/DAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T02:41:10.609785Z"},"content_sha256":"39ba1ec347bbcfc612403dee02bd75dc1a5d7d1388cc2caf410c7514d610e5c0","schema_version":"1.0","event_id":"sha256:39ba1ec347bbcfc612403dee02bd75dc1a5d7d1388cc2caf410c7514d610e5c0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/F6TA7TRFIEI4D2YA3NEUXXPFAS/bundle.json","state_url":"https://pith.science/pith/F6TA7TRFIEI4D2YA3NEUXXPFAS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/F6TA7TRFIEI4D2YA3NEUXXPFAS/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":"2026-06-01T02:41:10Z","links":{"resolver":"https://pith.science/pith/F6TA7TRFIEI4D2YA3NEUXXPFAS","bundle":"https://pith.science/pith/F6TA7TRFIEI4D2YA3NEUXXPFAS/bundle.json","state":"https://pith.science/pith/F6TA7TRFIEI4D2YA3NEUXXPFAS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/F6TA7TRFIEI4D2YA3NEUXXPFAS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:F6TA7TRFIEI4D2YA3NEUXXPFAS","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":"20be50e915e1aee9d5d5bf1c5861ef34411548cf4fcdbd298eeb469c017f1593","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-07-28T15:36:01Z","title_canon_sha256":"5e41e87ec201ea5ed4d9e5b018c7b2d28f1e3447f27108fcff4f3c3f2849fe50"},"schema_version":"1.0","source":{"id":"1507.07814","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.07814","created_at":"2026-05-18T00:31:43Z"},{"alias_kind":"arxiv_version","alias_value":"1507.07814v1","created_at":"2026-05-18T00:31:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.07814","created_at":"2026-05-18T00:31:43Z"},{"alias_kind":"pith_short_12","alias_value":"F6TA7TRFIEI4","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_16","alias_value":"F6TA7TRFIEI4D2YA","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_8","alias_value":"F6TA7TRF","created_at":"2026-05-18T12:29:19Z"}],"graph_snapshots":[{"event_id":"sha256:39ba1ec347bbcfc612403dee02bd75dc1a5d7d1388cc2caf410c7514d610e5c0","target":"graph","created_at":"2026-05-18T00:31:43Z","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":"Quantum metrology is the state-of-the-art measurement technology. It uses quantum resources to enhance the sensitivity of phase estimation beyond what reachable within classical physics. While single parameter estimation theory has been widely investigated, much less is known about the simultaneous estimation of multiple phases, which finds key applications in imaging and sensing. In this manuscript we provide conditions of useful entanglement (among multimode particles, qudits) for multiphase estimation and adapt them to multiarm Mach-Zehnder interferometry. We discuss benchmark multimode Foc","authors_text":"Augusto Smerzi, Chiara Vitelli, Fabio Sciarrino, Luca Pezz\\`e, Mario A. Ciampini, Nicol\\`o Spagnolo","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-07-28T15:36:01Z","title":"Quantum-enhanced multiparameter estimation in multiarm interferometers"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.07814","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":"sha256:8bdf2d14512207536f0c8a9646cf800a200c7a8188fbc8fdbf17bbabb7123bae","target":"record","created_at":"2026-05-18T00:31:43Z","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":"20be50e915e1aee9d5d5bf1c5861ef34411548cf4fcdbd298eeb469c017f1593","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-07-28T15:36:01Z","title_canon_sha256":"5e41e87ec201ea5ed4d9e5b018c7b2d28f1e3447f27108fcff4f3c3f2849fe50"},"schema_version":"1.0","source":{"id":"1507.07814","kind":"arxiv","version":1}},"canonical_sha256":"2fa60fce254111c1eb00db494bdde504a1deb1d7e9049e05f751f3967f57566d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2fa60fce254111c1eb00db494bdde504a1deb1d7e9049e05f751f3967f57566d","first_computed_at":"2026-05-18T00:31:43.981054Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:31:43.981054Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"87beleX88yyEkRAupJl8ursZsdIMjqUx0umpKunwaaaZEBfyZWLDvENjZevo+4eNd/pM36V+Gyv0kJjNoqD1BA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:31:43.981637Z","signed_message":"canonical_sha256_bytes"},"source_id":"1507.07814","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8bdf2d14512207536f0c8a9646cf800a200c7a8188fbc8fdbf17bbabb7123bae","sha256:39ba1ec347bbcfc612403dee02bd75dc1a5d7d1388cc2caf410c7514d610e5c0"],"state_sha256":"fe00d8ec5aab0b1fa13b56a0fe975b329fe27609b5b510453a757cdca2bf95f5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mXbnNTSmzSNVg3bnR8gOKXbycOjMH5xJw7CxQkDiEKW/AvHrssYhPSzJgKULXCgVlnAshjvI44+VTG4AYkpyDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T02:41:10.613054Z","bundle_sha256":"ea1dbcaa48d07a40965b46cd77311c4967f7e7cc0590ac8d6ea149552ada24af"}}