{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:GIGUVK6ACMZIVYYR5GJ6XDB43Y","short_pith_number":"pith:GIGUVK6A","canonical_record":{"source":{"id":"2409.06989","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2024-09-11T03:40:24Z","cross_cats_sorted":[],"title_canon_sha256":"0b9fd017b7d6a0f12fb01f436ebdadcd5c037de6918ba02703bf7f70ff4ac4b1","abstract_canon_sha256":"d29a9af969baa7e2bf113857c4f4c90671a86cd5ed72edd42e205956a693620c"},"schema_version":"1.0"},"canonical_sha256":"320d4aabc013328ae311e993eb8c3cde3d27fe9ae61eb17dfb051f114a82ad2e","source":{"kind":"arxiv","id":"2409.06989","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2409.06989","created_at":"2026-07-05T12:07:00Z"},{"alias_kind":"arxiv_version","alias_value":"2409.06989v1","created_at":"2026-07-05T12:07:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2409.06989","created_at":"2026-07-05T12:07:00Z"},{"alias_kind":"pith_short_12","alias_value":"GIGUVK6ACMZI","created_at":"2026-07-05T12:07:00Z"},{"alias_kind":"pith_short_16","alias_value":"GIGUVK6ACMZIVYYR","created_at":"2026-07-05T12:07:00Z"},{"alias_kind":"pith_short_8","alias_value":"GIGUVK6A","created_at":"2026-07-05T12:07:00Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:GIGUVK6ACMZIVYYR5GJ6XDB43Y","target":"record","payload":{"canonical_record":{"source":{"id":"2409.06989","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2024-09-11T03:40:24Z","cross_cats_sorted":[],"title_canon_sha256":"0b9fd017b7d6a0f12fb01f436ebdadcd5c037de6918ba02703bf7f70ff4ac4b1","abstract_canon_sha256":"d29a9af969baa7e2bf113857c4f4c90671a86cd5ed72edd42e205956a693620c"},"schema_version":"1.0"},"canonical_sha256":"320d4aabc013328ae311e993eb8c3cde3d27fe9ae61eb17dfb051f114a82ad2e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T12:07:00.895583Z","signature_b64":"5FrHbr4+1uzsF6MP2kTzc38VwF0Uxtn4cc38vGgjjRYHDI4qqi4a872XoTPsIs9+v0SRVS5i4tzZWdeTJDkCBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"320d4aabc013328ae311e993eb8c3cde3d27fe9ae61eb17dfb051f114a82ad2e","last_reissued_at":"2026-07-05T12:07:00.895049Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T12:07:00.895049Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2409.06989","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":"2026-07-05T12:07:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XrkNRmssNyj52opjhS/I2XxChUX02ey40tbZ2wAt3zh5sBOwTga9pYr6JSCRfeYA8fMsA1FN1HE2E8OFaLSkBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T19:17:38.256139Z"},"content_sha256":"b01589cbebc9702a33795248e101f98a1e477d606d77879cc231eac089c0431f","schema_version":"1.0","event_id":"sha256:b01589cbebc9702a33795248e101f98a1e477d606d77879cc231eac089c0431f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:GIGUVK6ACMZIVYYR5GJ6XDB43Y","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Realization of Constant-Depth Fan-Out with Real-Time Feedforward on a Superconducting Quantum Processor","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Alexander Flasby, Andreas Wallraff, Christoph Hellings, Dante Colao Zanuz, Fran\\c{c}ois Swiadek, Ilya Besedin, Jean-Claude Besse, Liberto Beltr\\'an, Marek Pechal, Michael Kerschbaum, Yongxin Song","submitted_at":"2024-09-11T03:40:24Z","abstract_excerpt":"When using unitary gate sequences, the growth in depth of many quantum circuits with output size poses significant obstacles to practical quantum computation. The quantum fan-out operation, which reduces the circuit depth of quantum algorithms such as the quantum Fourier transform and Shor's algorithm, is an example that can be realized in constant depth independent of the output size. Here, we demonstrate a quantum fan-out gate with real-time feedforward on up to four output qubits using a superconducting quantum processor. By performing quantum state tomography on the output states, we bench"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2409.06989","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2409.06989/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":"2026-07-05T12:07:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"H/Zyo6Uvq032eJgioFqvHXfs6T5yehl0+uNI6NId3mJ8nWKHmzCYfZuFlOi1W7fABiIh8z4hRkdZmxzDlxALBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T19:17:38.256670Z"},"content_sha256":"d8439ab78cbb29a28aa67a8025b4a1cc17fc55c6613a33be9eb8aabbbd1dc8f9","schema_version":"1.0","event_id":"sha256:d8439ab78cbb29a28aa67a8025b4a1cc17fc55c6613a33be9eb8aabbbd1dc8f9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GIGUVK6ACMZIVYYR5GJ6XDB43Y/bundle.json","state_url":"https://pith.science/pith/GIGUVK6ACMZIVYYR5GJ6XDB43Y/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GIGUVK6ACMZIVYYR5GJ6XDB43Y/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":"2026-08-07T19:17:38Z","links":{"resolver":"https://pith.science/pith/GIGUVK6ACMZIVYYR5GJ6XDB43Y","bundle":"https://pith.science/pith/GIGUVK6ACMZIVYYR5GJ6XDB43Y/bundle.json","state":"https://pith.science/pith/GIGUVK6ACMZIVYYR5GJ6XDB43Y/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GIGUVK6ACMZIVYYR5GJ6XDB43Y/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:GIGUVK6ACMZIVYYR5GJ6XDB43Y","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":"d29a9af969baa7e2bf113857c4f4c90671a86cd5ed72edd42e205956a693620c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2024-09-11T03:40:24Z","title_canon_sha256":"0b9fd017b7d6a0f12fb01f436ebdadcd5c037de6918ba02703bf7f70ff4ac4b1"},"schema_version":"1.0","source":{"id":"2409.06989","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2409.06989","created_at":"2026-07-05T12:07:00Z"},{"alias_kind":"arxiv_version","alias_value":"2409.06989v1","created_at":"2026-07-05T12:07:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2409.06989","created_at":"2026-07-05T12:07:00Z"},{"alias_kind":"pith_short_12","alias_value":"GIGUVK6ACMZI","created_at":"2026-07-05T12:07:00Z"},{"alias_kind":"pith_short_16","alias_value":"GIGUVK6ACMZIVYYR","created_at":"2026-07-05T12:07:00Z"},{"alias_kind":"pith_short_8","alias_value":"GIGUVK6A","created_at":"2026-07-05T12:07:00Z"}],"graph_snapshots":[{"event_id":"sha256:d8439ab78cbb29a28aa67a8025b4a1cc17fc55c6613a33be9eb8aabbbd1dc8f9","target":"graph","created_at":"2026-07-05T12:07:00Z","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/2409.06989/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"When using unitary gate sequences, the growth in depth of many quantum circuits with output size poses significant obstacles to practical quantum computation. The quantum fan-out operation, which reduces the circuit depth of quantum algorithms such as the quantum Fourier transform and Shor's algorithm, is an example that can be realized in constant depth independent of the output size. Here, we demonstrate a quantum fan-out gate with real-time feedforward on up to four output qubits using a superconducting quantum processor. By performing quantum state tomography on the output states, we bench","authors_text":"Alexander Flasby, Andreas Wallraff, Christoph Hellings, Dante Colao Zanuz, Fran\\c{c}ois Swiadek, Ilya Besedin, Jean-Claude Besse, Liberto Beltr\\'an, Marek Pechal, Michael Kerschbaum, Yongxin Song","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2024-09-11T03:40:24Z","title":"Realization of Constant-Depth Fan-Out with Real-Time Feedforward on a Superconducting Quantum Processor"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2409.06989","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:b01589cbebc9702a33795248e101f98a1e477d606d77879cc231eac089c0431f","target":"record","created_at":"2026-07-05T12:07:00Z","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":"d29a9af969baa7e2bf113857c4f4c90671a86cd5ed72edd42e205956a693620c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2024-09-11T03:40:24Z","title_canon_sha256":"0b9fd017b7d6a0f12fb01f436ebdadcd5c037de6918ba02703bf7f70ff4ac4b1"},"schema_version":"1.0","source":{"id":"2409.06989","kind":"arxiv","version":1}},"canonical_sha256":"320d4aabc013328ae311e993eb8c3cde3d27fe9ae61eb17dfb051f114a82ad2e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"320d4aabc013328ae311e993eb8c3cde3d27fe9ae61eb17dfb051f114a82ad2e","first_computed_at":"2026-07-05T12:07:00.895049Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T12:07:00.895049Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5FrHbr4+1uzsF6MP2kTzc38VwF0Uxtn4cc38vGgjjRYHDI4qqi4a872XoTPsIs9+v0SRVS5i4tzZWdeTJDkCBQ==","signature_status":"signed_v1","signed_at":"2026-07-05T12:07:00.895583Z","signed_message":"canonical_sha256_bytes"},"source_id":"2409.06989","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b01589cbebc9702a33795248e101f98a1e477d606d77879cc231eac089c0431f","sha256:d8439ab78cbb29a28aa67a8025b4a1cc17fc55c6613a33be9eb8aabbbd1dc8f9"],"state_sha256":"7c2bbb238f92a8e6168b4492189fcadb1e7c014d1d88dd7c4827da57b7541481"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+bSD50cmmjI5uz4Dn6SOGyDIm7qXtTI189TqIiUAhcMdbKE/tAkfeMS1UUSQu84zPRY+vPfSToOXPa+1BXpnBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-07T19:17:38.260864Z","bundle_sha256":"62c3909433ab0d556f309fe70a4d5bc9360390cb6ed104b4bdfec3d40a98f581"}}