{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:GBEOKGRCYUULFGIQWBJEDJU7K4","short_pith_number":"pith:GBEOKGRC","canonical_record":{"source":{"id":"2404.16541","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2024-04-25T11:58:06Z","cross_cats_sorted":[],"title_canon_sha256":"6b5c69c4525423d279cc9549066dcba1de7fc0e30dfe413f6636267b37f98af3","abstract_canon_sha256":"860227a38bd90860556866f84fd3393b47aa1e315a45c34ff6e1906d04d8617a"},"schema_version":"1.0"},"canonical_sha256":"3048e51a22c528b29910b05241a69f571784b5900c60dbb95b200fdb5776aaa1","source":{"kind":"arxiv","id":"2404.16541","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2404.16541","created_at":"2026-07-05T08:42:35Z"},{"alias_kind":"arxiv_version","alias_value":"2404.16541v1","created_at":"2026-07-05T08:42:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2404.16541","created_at":"2026-07-05T08:42:35Z"},{"alias_kind":"pith_short_12","alias_value":"GBEOKGRCYUUL","created_at":"2026-07-05T08:42:35Z"},{"alias_kind":"pith_short_16","alias_value":"GBEOKGRCYUULFGIQ","created_at":"2026-07-05T08:42:35Z"},{"alias_kind":"pith_short_8","alias_value":"GBEOKGRC","created_at":"2026-07-05T08:42:35Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:GBEOKGRCYUULFGIQWBJEDJU7K4","target":"record","payload":{"canonical_record":{"source":{"id":"2404.16541","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2024-04-25T11:58:06Z","cross_cats_sorted":[],"title_canon_sha256":"6b5c69c4525423d279cc9549066dcba1de7fc0e30dfe413f6636267b37f98af3","abstract_canon_sha256":"860227a38bd90860556866f84fd3393b47aa1e315a45c34ff6e1906d04d8617a"},"schema_version":"1.0"},"canonical_sha256":"3048e51a22c528b29910b05241a69f571784b5900c60dbb95b200fdb5776aaa1","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T08:42:35.784889Z","signature_b64":"Vknvdj7/qYkBH+57E1huY7dZjpPdwj5bE3c29qG5NhaAd1k0Uqk/2jWs5hkBU6oWoVQhWarQAVGcPH6RMDXtCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3048e51a22c528b29910b05241a69f571784b5900c60dbb95b200fdb5776aaa1","last_reissued_at":"2026-07-05T08:42:35.784457Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T08:42:35.784457Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2404.16541","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":"2026-07-05T08:42:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7rSPgJFnzGU7ik44zOKh/HjBlr26f4EUTbMGewEl50eSu72oC7Hdt68r5wdErcDznxrz0hzp30XFcc1k/AFyDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T02:53:06.595290Z"},"content_sha256":"515db446fb5b35dce131fd4e7a0687c612c49745bd486bb3c6e4416734986cb7","schema_version":"1.0","event_id":"sha256:515db446fb5b35dce131fd4e7a0687c612c49745bd486bb3c6e4416734986cb7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:GBEOKGRCYUULFGIQWBJEDJU7K4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Optimal depth and a novel approach to variational quantum process tomography","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Christian Deppe, Pol Juli\\`a Farr\\'e, Roberto Ferrara, Soham Ghosh, Vladlen Galetsky","submitted_at":"2024-04-25T11:58:06Z","abstract_excerpt":"In this work, we present two new methods for Variational Quantum Circuit (VQC) Process Tomography onto $n$ qubits systems: PT_VQC and U-VQSVD.\n  Compared to the state of the art, PT_VQC halves in each run the required amount of qubits for process tomography and decreases the required state initializations from $4^{n}$ to just $2^{n}$, all while ensuring high-fidelity reconstruction of the targeted unitary channel $U$. It is worth noting that, for a fixed reconstruction accuracy, PT_VQC achieves faster convergence per iteration step compared to Quantum Deep Neural Network (QDNN) and tensor netw"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2404.16541","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/2404.16541/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":"2026-07-05T08:42:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hi359GrmYERyXDgYPnMjb70xJlX193QGalY8npQRzoV8ujv8KvLkVCCrIPks7baIhSimnr6PADP05Aq7FVG1AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T02:53:06.595773Z"},"content_sha256":"5490693f2588b0222eafeaa9f7c8c795b7d88b63992e80ecb2336a9086bf8b26","schema_version":"1.0","event_id":"sha256:5490693f2588b0222eafeaa9f7c8c795b7d88b63992e80ecb2336a9086bf8b26"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GBEOKGRCYUULFGIQWBJEDJU7K4/bundle.json","state_url":"https://pith.science/pith/GBEOKGRCYUULFGIQWBJEDJU7K4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GBEOKGRCYUULFGIQWBJEDJU7K4/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":"2026-08-13T02:53:06Z","links":{"resolver":"https://pith.science/pith/GBEOKGRCYUULFGIQWBJEDJU7K4","bundle":"https://pith.science/pith/GBEOKGRCYUULFGIQWBJEDJU7K4/bundle.json","state":"https://pith.science/pith/GBEOKGRCYUULFGIQWBJEDJU7K4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GBEOKGRCYUULFGIQWBJEDJU7K4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:GBEOKGRCYUULFGIQWBJEDJU7K4","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":"860227a38bd90860556866f84fd3393b47aa1e315a45c34ff6e1906d04d8617a","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2024-04-25T11:58:06Z","title_canon_sha256":"6b5c69c4525423d279cc9549066dcba1de7fc0e30dfe413f6636267b37f98af3"},"schema_version":"1.0","source":{"id":"2404.16541","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2404.16541","created_at":"2026-07-05T08:42:35Z"},{"alias_kind":"arxiv_version","alias_value":"2404.16541v1","created_at":"2026-07-05T08:42:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2404.16541","created_at":"2026-07-05T08:42:35Z"},{"alias_kind":"pith_short_12","alias_value":"GBEOKGRCYUUL","created_at":"2026-07-05T08:42:35Z"},{"alias_kind":"pith_short_16","alias_value":"GBEOKGRCYUULFGIQ","created_at":"2026-07-05T08:42:35Z"},{"alias_kind":"pith_short_8","alias_value":"GBEOKGRC","created_at":"2026-07-05T08:42:35Z"}],"graph_snapshots":[{"event_id":"sha256:5490693f2588b0222eafeaa9f7c8c795b7d88b63992e80ecb2336a9086bf8b26","target":"graph","created_at":"2026-07-05T08:42:35Z","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/2404.16541/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In this work, we present two new methods for Variational Quantum Circuit (VQC) Process Tomography onto $n$ qubits systems: PT_VQC and U-VQSVD.\n  Compared to the state of the art, PT_VQC halves in each run the required amount of qubits for process tomography and decreases the required state initializations from $4^{n}$ to just $2^{n}$, all while ensuring high-fidelity reconstruction of the targeted unitary channel $U$. It is worth noting that, for a fixed reconstruction accuracy, PT_VQC achieves faster convergence per iteration step compared to Quantum Deep Neural Network (QDNN) and tensor netw","authors_text":"Christian Deppe, Pol Juli\\`a Farr\\'e, Roberto Ferrara, Soham Ghosh, Vladlen Galetsky","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2024-04-25T11:58:06Z","title":"Optimal depth and a novel approach to variational quantum process tomography"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2404.16541","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":"sha256:515db446fb5b35dce131fd4e7a0687c612c49745bd486bb3c6e4416734986cb7","target":"record","created_at":"2026-07-05T08:42:35Z","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":"860227a38bd90860556866f84fd3393b47aa1e315a45c34ff6e1906d04d8617a","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2024-04-25T11:58:06Z","title_canon_sha256":"6b5c69c4525423d279cc9549066dcba1de7fc0e30dfe413f6636267b37f98af3"},"schema_version":"1.0","source":{"id":"2404.16541","kind":"arxiv","version":1}},"canonical_sha256":"3048e51a22c528b29910b05241a69f571784b5900c60dbb95b200fdb5776aaa1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3048e51a22c528b29910b05241a69f571784b5900c60dbb95b200fdb5776aaa1","first_computed_at":"2026-07-05T08:42:35.784457Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T08:42:35.784457Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Vknvdj7/qYkBH+57E1huY7dZjpPdwj5bE3c29qG5NhaAd1k0Uqk/2jWs5hkBU6oWoVQhWarQAVGcPH6RMDXtCQ==","signature_status":"signed_v1","signed_at":"2026-07-05T08:42:35.784889Z","signed_message":"canonical_sha256_bytes"},"source_id":"2404.16541","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:515db446fb5b35dce131fd4e7a0687c612c49745bd486bb3c6e4416734986cb7","sha256:5490693f2588b0222eafeaa9f7c8c795b7d88b63992e80ecb2336a9086bf8b26"],"state_sha256":"84791309a514732d0fdf659a29d8518ccb8deca0d4dbc8a6e9367b6bba0ea9e8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XPSynCLMHtVEHBonZ5AkwXsolplkTJ/xVgqQIBj1GswWh/JgXsdHc/ty6G9C9FZ55eHL2HHChl2vTpxp3DMmCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-13T02:53:06.598995Z","bundle_sha256":"7eefd8c2b971ede53fe1f849967732092784ad0301e20304dfee19f931b2f258"}}