{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:BQXKZHUCP443GU5LQTFVSGTJSS","short_pith_number":"pith:BQXKZHUC","canonical_record":{"source":{"id":"1405.7198","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-05-28T11:14:43Z","cross_cats_sorted":[],"title_canon_sha256":"ab6f6439167e0876f999c9784298cb2ac2ca8b71c5b88aef258fa636e1a9d7a4","abstract_canon_sha256":"02bc36dad3cf7d2a5042423a7411a2ee0dcb5045821337435d6500c2c468557a"},"schema_version":"1.0"},"canonical_sha256":"0c2eac9e827f39b353ab84cb591a699480925f15aab23b079d5c299266584167","source":{"kind":"arxiv","id":"1405.7198","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1405.7198","created_at":"2026-05-18T02:18:51Z"},{"alias_kind":"arxiv_version","alias_value":"1405.7198v2","created_at":"2026-05-18T02:18:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1405.7198","created_at":"2026-05-18T02:18:51Z"},{"alias_kind":"pith_short_12","alias_value":"BQXKZHUCP443","created_at":"2026-05-18T12:28:22Z"},{"alias_kind":"pith_short_16","alias_value":"BQXKZHUCP443GU5L","created_at":"2026-05-18T12:28:22Z"},{"alias_kind":"pith_short_8","alias_value":"BQXKZHUC","created_at":"2026-05-18T12:28:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:BQXKZHUCP443GU5LQTFVSGTJSS","target":"record","payload":{"canonical_record":{"source":{"id":"1405.7198","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-05-28T11:14:43Z","cross_cats_sorted":[],"title_canon_sha256":"ab6f6439167e0876f999c9784298cb2ac2ca8b71c5b88aef258fa636e1a9d7a4","abstract_canon_sha256":"02bc36dad3cf7d2a5042423a7411a2ee0dcb5045821337435d6500c2c468557a"},"schema_version":"1.0"},"canonical_sha256":"0c2eac9e827f39b353ab84cb591a699480925f15aab23b079d5c299266584167","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:18:51.726663Z","signature_b64":"YQJU8K6YM8nssMzuB8mpLXfqb/w7lVXnRTNrFRskeqyeJs2EDPzlBlHL6qMekG1rXvlm1bFFH9RZeXlr1V87Dg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0c2eac9e827f39b353ab84cb591a699480925f15aab23b079d5c299266584167","last_reissued_at":"2026-05-18T02:18:51.726086Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:18:51.726086Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1405.7198","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":"2026-05-18T02:18:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nc3riQ0ewsq9KpJOqGXI+sLgNCVizwXmVJa0rcYKX1xtOjZPCm/fnltrlHS6HLSe+Ki1G0ZcesVKcpPlYyaPCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T02:13:51.766970Z"},"content_sha256":"1088cd4e9e27da346c5a3773435a388b7cbdaee14f331846ad09f2dacd40de17","schema_version":"1.0","event_id":"sha256:1088cd4e9e27da346c5a3773435a388b7cbdaee14f331846ad09f2dacd40de17"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:BQXKZHUCP443GU5LQTFVSGTJSS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Multi-mode Entanglement is Detrimental to Lossy Optical Quantum Metrology","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"J.A. Dunningham, Kae Nemoto, P.A. Knott, T.J. Proctor, W.J. Munro","submitted_at":"2014-05-28T11:14:43Z","abstract_excerpt":"In optical interferometry multi-mode entanglement is often assumed to be the driving force behind quantum enhanced measurements. Recent work has shown this assumption to be false: single mode quantum states perform just as well as their multi-mode entangled counterparts. We go beyond this to show that when photon losses occur - an inevitability in any realistic system - multi-mode entanglement is actually detrimental to obtaining quantum enhanced measurements. We specifically apply this idea to a superposition of coherent states, demonstrating that these states show a robustness to loss that a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1405.7198","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":"2026-05-18T02:18:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aPIOC7NiG1UBu1IAhxPOEDTyWLFKre+slAD2+bzIpVrWf8hrj9572LOv3w7Zp8RYW+hdxb5YFnigCzoYekCCBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T02:13:51.767618Z"},"content_sha256":"e898bfcfe06c23f2c2e5be3ac42cd59fc4bdc5d9743a340d971215f1087c61ed","schema_version":"1.0","event_id":"sha256:e898bfcfe06c23f2c2e5be3ac42cd59fc4bdc5d9743a340d971215f1087c61ed"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BQXKZHUCP443GU5LQTFVSGTJSS/bundle.json","state_url":"https://pith.science/pith/BQXKZHUCP443GU5LQTFVSGTJSS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BQXKZHUCP443GU5LQTFVSGTJSS/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":"2026-05-31T02:13:51Z","links":{"resolver":"https://pith.science/pith/BQXKZHUCP443GU5LQTFVSGTJSS","bundle":"https://pith.science/pith/BQXKZHUCP443GU5LQTFVSGTJSS/bundle.json","state":"https://pith.science/pith/BQXKZHUCP443GU5LQTFVSGTJSS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BQXKZHUCP443GU5LQTFVSGTJSS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:BQXKZHUCP443GU5LQTFVSGTJSS","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":"02bc36dad3cf7d2a5042423a7411a2ee0dcb5045821337435d6500c2c468557a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-05-28T11:14:43Z","title_canon_sha256":"ab6f6439167e0876f999c9784298cb2ac2ca8b71c5b88aef258fa636e1a9d7a4"},"schema_version":"1.0","source":{"id":"1405.7198","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1405.7198","created_at":"2026-05-18T02:18:51Z"},{"alias_kind":"arxiv_version","alias_value":"1405.7198v2","created_at":"2026-05-18T02:18:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1405.7198","created_at":"2026-05-18T02:18:51Z"},{"alias_kind":"pith_short_12","alias_value":"BQXKZHUCP443","created_at":"2026-05-18T12:28:22Z"},{"alias_kind":"pith_short_16","alias_value":"BQXKZHUCP443GU5L","created_at":"2026-05-18T12:28:22Z"},{"alias_kind":"pith_short_8","alias_value":"BQXKZHUC","created_at":"2026-05-18T12:28:22Z"}],"graph_snapshots":[{"event_id":"sha256:e898bfcfe06c23f2c2e5be3ac42cd59fc4bdc5d9743a340d971215f1087c61ed","target":"graph","created_at":"2026-05-18T02:18:51Z","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":"In optical interferometry multi-mode entanglement is often assumed to be the driving force behind quantum enhanced measurements. Recent work has shown this assumption to be false: single mode quantum states perform just as well as their multi-mode entangled counterparts. We go beyond this to show that when photon losses occur - an inevitability in any realistic system - multi-mode entanglement is actually detrimental to obtaining quantum enhanced measurements. We specifically apply this idea to a superposition of coherent states, demonstrating that these states show a robustness to loss that a","authors_text":"J.A. Dunningham, Kae Nemoto, P.A. Knott, T.J. Proctor, W.J. Munro","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-05-28T11:14:43Z","title":"Multi-mode Entanglement is Detrimental to Lossy Optical Quantum Metrology"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1405.7198","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":"sha256:1088cd4e9e27da346c5a3773435a388b7cbdaee14f331846ad09f2dacd40de17","target":"record","created_at":"2026-05-18T02:18:51Z","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":"02bc36dad3cf7d2a5042423a7411a2ee0dcb5045821337435d6500c2c468557a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-05-28T11:14:43Z","title_canon_sha256":"ab6f6439167e0876f999c9784298cb2ac2ca8b71c5b88aef258fa636e1a9d7a4"},"schema_version":"1.0","source":{"id":"1405.7198","kind":"arxiv","version":2}},"canonical_sha256":"0c2eac9e827f39b353ab84cb591a699480925f15aab23b079d5c299266584167","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0c2eac9e827f39b353ab84cb591a699480925f15aab23b079d5c299266584167","first_computed_at":"2026-05-18T02:18:51.726086Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:18:51.726086Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"YQJU8K6YM8nssMzuB8mpLXfqb/w7lVXnRTNrFRskeqyeJs2EDPzlBlHL6qMekG1rXvlm1bFFH9RZeXlr1V87Dg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:18:51.726663Z","signed_message":"canonical_sha256_bytes"},"source_id":"1405.7198","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1088cd4e9e27da346c5a3773435a388b7cbdaee14f331846ad09f2dacd40de17","sha256:e898bfcfe06c23f2c2e5be3ac42cd59fc4bdc5d9743a340d971215f1087c61ed"],"state_sha256":"8dc4905f16c0e97c54d0b010ec7888fa57cb84a6e5a1f84392a2122f1e04dbcf"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QhoQnWmoHDOweKACAA++dwrpbS+ZTs8cNYvQ/GK7HHArBFhvVTNgOpQ3K/o/8eml507gURXbgS0yNybs0GgNDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T02:13:51.770726Z","bundle_sha256":"e9edb213c105eb290faa4cbdcdee571dc2b4f2359dc9f2bb703d9dc47d909f21"}}