{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:AMJXFFQV4I54I7V4NV52ULJ2EI","short_pith_number":"pith:AMJXFFQV","canonical_record":{"source":{"id":"1909.01282","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-09-03T16:27:12Z","cross_cats_sorted":["cond-mat.dis-nn","cond-mat.quant-gas"],"title_canon_sha256":"b3b353a3d220ddb0478368091a14cce8e00912c506dc03b9af2b9615a58c0063","abstract_canon_sha256":"7eabf4456fca7f1ee85dfde340374e5988aca05e5d0a3692c05af43b3fb60328"},"schema_version":"1.0"},"canonical_sha256":"0313729615e23bc47ebc6d7baa2d3a220f1f8330e8a1dfda10f66a0acf10373a","source":{"kind":"arxiv","id":"1909.01282","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.01282","created_at":"2026-07-05T00:32:51Z"},{"alias_kind":"arxiv_version","alias_value":"1909.01282v3","created_at":"2026-07-05T00:32:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.01282","created_at":"2026-07-05T00:32:51Z"},{"alias_kind":"pith_short_12","alias_value":"AMJXFFQV4I54","created_at":"2026-07-05T00:32:51Z"},{"alias_kind":"pith_short_16","alias_value":"AMJXFFQV4I54I7V4","created_at":"2026-07-05T00:32:51Z"},{"alias_kind":"pith_short_8","alias_value":"AMJXFFQV","created_at":"2026-07-05T00:32:51Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:AMJXFFQV4I54I7V4NV52ULJ2EI","target":"record","payload":{"canonical_record":{"source":{"id":"1909.01282","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-09-03T16:27:12Z","cross_cats_sorted":["cond-mat.dis-nn","cond-mat.quant-gas"],"title_canon_sha256":"b3b353a3d220ddb0478368091a14cce8e00912c506dc03b9af2b9615a58c0063","abstract_canon_sha256":"7eabf4456fca7f1ee85dfde340374e5988aca05e5d0a3692c05af43b3fb60328"},"schema_version":"1.0"},"canonical_sha256":"0313729615e23bc47ebc6d7baa2d3a220f1f8330e8a1dfda10f66a0acf10373a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:32:51.582017Z","signature_b64":"7S1cl4cXKW/SB8miDmrS1GAlVcwM86itRPRrRpTjTNfOGR5yip2F8hhzWJUCdlM1C2k+E8s/ibio7M4rQIcLAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0313729615e23bc47ebc6d7baa2d3a220f1f8330e8a1dfda10f66a0acf10373a","last_reissued_at":"2026-07-05T00:32:51.581630Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:32:51.581630Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1909.01282","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T00:32:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0P5nfpWv4aeGQg/qaAph/TruLFe87D1MM6Eg4YzYjmWKjDQjEC/MMng3ooOn/1LEPVGb3Sjb3hax6D0No7WQCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T05:09:59.520188Z"},"content_sha256":"41b7053a950fbaa3479209417cd37ce4b98d77996434cdf3683bccb5588f1c0d","schema_version":"1.0","event_id":"sha256:41b7053a950fbaa3479209417cd37ce4b98d77996434cdf3683bccb5588f1c0d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:AMJXFFQV4I54I7V4NV52ULJ2EI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Cross-Platform Verification of Intermediate Scale Quantum Devices","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.dis-nn","cond-mat.quant-gas"],"primary_cat":"quant-ph","authors_text":"Andreas Elben, Beno\\^it Vermersch, Christian F. Roos, Christian Kokail, Christine Maier, Manoj Joshi, Peter Zoller, Rainer Blatt, Rick van Bijnen, Tiff Brydges","submitted_at":"2019-09-03T16:27:12Z","abstract_excerpt":"We describe a protocol for cross-platform verification of quantum simulators and quantum computers. We show how to measure directly the overlap $\\textrm{Tr}\\left[\\rho_1 \\rho_2\\right]$ and the purities $\\textrm{Tr}\\left[\\rho^2_{1,2}\\right]$, and thus a fidelity of two possibly mixed quantum states $\\rho_1$ and $\\rho_2$ prepared in separate experimental platforms. We require only local measurements in randomized product bases, which are communicated classically. As a proof-of-principle, we present the measurement of experiment-theory fidelities for entangled $10$-qubit quantum states in a trappe"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.01282","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1909.01282/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T00:32:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oNnAcs0kMndQumQS/dDobH5e7G9ODBF9sNGDdx1NnST090rJbb+iWpxPenZiHbyaDg2k22hu3X6sadLQ8CbKCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T05:09:59.520729Z"},"content_sha256":"f6eb32b6a698a55d9c956fa690da687bff8c973df84f1fe610b52535f8081086","schema_version":"1.0","event_id":"sha256:f6eb32b6a698a55d9c956fa690da687bff8c973df84f1fe610b52535f8081086"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/AMJXFFQV4I54I7V4NV52ULJ2EI/bundle.json","state_url":"https://pith.science/pith/AMJXFFQV4I54I7V4NV52ULJ2EI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/AMJXFFQV4I54I7V4NV52ULJ2EI/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":"2026-08-16T05:09:59Z","links":{"resolver":"https://pith.science/pith/AMJXFFQV4I54I7V4NV52ULJ2EI","bundle":"https://pith.science/pith/AMJXFFQV4I54I7V4NV52ULJ2EI/bundle.json","state":"https://pith.science/pith/AMJXFFQV4I54I7V4NV52ULJ2EI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/AMJXFFQV4I54I7V4NV52ULJ2EI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:AMJXFFQV4I54I7V4NV52ULJ2EI","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":"7eabf4456fca7f1ee85dfde340374e5988aca05e5d0a3692c05af43b3fb60328","cross_cats_sorted":["cond-mat.dis-nn","cond-mat.quant-gas"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-09-03T16:27:12Z","title_canon_sha256":"b3b353a3d220ddb0478368091a14cce8e00912c506dc03b9af2b9615a58c0063"},"schema_version":"1.0","source":{"id":"1909.01282","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.01282","created_at":"2026-07-05T00:32:51Z"},{"alias_kind":"arxiv_version","alias_value":"1909.01282v3","created_at":"2026-07-05T00:32:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.01282","created_at":"2026-07-05T00:32:51Z"},{"alias_kind":"pith_short_12","alias_value":"AMJXFFQV4I54","created_at":"2026-07-05T00:32:51Z"},{"alias_kind":"pith_short_16","alias_value":"AMJXFFQV4I54I7V4","created_at":"2026-07-05T00:32:51Z"},{"alias_kind":"pith_short_8","alias_value":"AMJXFFQV","created_at":"2026-07-05T00:32:51Z"}],"graph_snapshots":[{"event_id":"sha256:f6eb32b6a698a55d9c956fa690da687bff8c973df84f1fe610b52535f8081086","target":"graph","created_at":"2026-07-05T00:32:51Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1909.01282/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We describe a protocol for cross-platform verification of quantum simulators and quantum computers. We show how to measure directly the overlap $\\textrm{Tr}\\left[\\rho_1 \\rho_2\\right]$ and the purities $\\textrm{Tr}\\left[\\rho^2_{1,2}\\right]$, and thus a fidelity of two possibly mixed quantum states $\\rho_1$ and $\\rho_2$ prepared in separate experimental platforms. We require only local measurements in randomized product bases, which are communicated classically. As a proof-of-principle, we present the measurement of experiment-theory fidelities for entangled $10$-qubit quantum states in a trappe","authors_text":"Andreas Elben, Beno\\^it Vermersch, Christian F. Roos, Christian Kokail, Christine Maier, Manoj Joshi, Peter Zoller, Rainer Blatt, Rick van Bijnen, Tiff Brydges","cross_cats":["cond-mat.dis-nn","cond-mat.quant-gas"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-09-03T16:27:12Z","title":"Cross-Platform Verification of Intermediate Scale Quantum Devices"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.01282","kind":"arxiv","version":3},"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":"sha256:41b7053a950fbaa3479209417cd37ce4b98d77996434cdf3683bccb5588f1c0d","target":"record","created_at":"2026-07-05T00:32:51Z","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":"7eabf4456fca7f1ee85dfde340374e5988aca05e5d0a3692c05af43b3fb60328","cross_cats_sorted":["cond-mat.dis-nn","cond-mat.quant-gas"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-09-03T16:27:12Z","title_canon_sha256":"b3b353a3d220ddb0478368091a14cce8e00912c506dc03b9af2b9615a58c0063"},"schema_version":"1.0","source":{"id":"1909.01282","kind":"arxiv","version":3}},"canonical_sha256":"0313729615e23bc47ebc6d7baa2d3a220f1f8330e8a1dfda10f66a0acf10373a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0313729615e23bc47ebc6d7baa2d3a220f1f8330e8a1dfda10f66a0acf10373a","first_computed_at":"2026-07-05T00:32:51.581630Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:32:51.581630Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"7S1cl4cXKW/SB8miDmrS1GAlVcwM86itRPRrRpTjTNfOGR5yip2F8hhzWJUCdlM1C2k+E8s/ibio7M4rQIcLAw==","signature_status":"signed_v1","signed_at":"2026-07-05T00:32:51.582017Z","signed_message":"canonical_sha256_bytes"},"source_id":"1909.01282","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:41b7053a950fbaa3479209417cd37ce4b98d77996434cdf3683bccb5588f1c0d","sha256:f6eb32b6a698a55d9c956fa690da687bff8c973df84f1fe610b52535f8081086"],"state_sha256":"bbfe1d0599ed04acc3f99f1a96ee3f86b1c91ca9ff9c251046e2cacc0b307d8b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"v1Dt/2jpvvWySZXOQrvrGQuOgHoFHorZ9KDfFby4PlIF4P9hpaFmabdRT9kyonobRpv5D/4qh+b5t+ketdhzCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T05:09:59.526090Z","bundle_sha256":"a43cc8e3bbbbdf68d9d8f699fc402addf78ccacc8e88d6f279949edaa8637f7e"}}