{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:4ASC55NJDSJWJ6BKGSMIGUQDE5","short_pith_number":"pith:4ASC55NJ","canonical_record":{"source":{"id":"2010.09959","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-10-20T02:03:16Z","cross_cats_sorted":[],"title_canon_sha256":"bb3f6ecd5c98c06dd424f2fcc0c0b4ec705e7e6478f73aeff8e621944aa0400a","abstract_canon_sha256":"234338392ed540bb167f9325b33ba524a7f0616264195985ffb4ed0f57148101"},"schema_version":"1.0"},"canonical_sha256":"e0242ef5a91c9364f82a349883520327797cac1f5c4c0a1e06b8ecbaf72484fb","source":{"kind":"arxiv","id":"2010.09959","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2010.09959","created_at":"2026-07-05T03:02:41Z"},{"alias_kind":"arxiv_version","alias_value":"2010.09959v2","created_at":"2026-07-05T03:02:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2010.09959","created_at":"2026-07-05T03:02:41Z"},{"alias_kind":"pith_short_12","alias_value":"4ASC55NJDSJW","created_at":"2026-07-05T03:02:41Z"},{"alias_kind":"pith_short_16","alias_value":"4ASC55NJDSJWJ6BK","created_at":"2026-07-05T03:02:41Z"},{"alias_kind":"pith_short_8","alias_value":"4ASC55NJ","created_at":"2026-07-05T03:02:41Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:4ASC55NJDSJWJ6BKGSMIGUQDE5","target":"record","payload":{"canonical_record":{"source":{"id":"2010.09959","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-10-20T02:03:16Z","cross_cats_sorted":[],"title_canon_sha256":"bb3f6ecd5c98c06dd424f2fcc0c0b4ec705e7e6478f73aeff8e621944aa0400a","abstract_canon_sha256":"234338392ed540bb167f9325b33ba524a7f0616264195985ffb4ed0f57148101"},"schema_version":"1.0"},"canonical_sha256":"e0242ef5a91c9364f82a349883520327797cac1f5c4c0a1e06b8ecbaf72484fb","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:02:41.120303Z","signature_b64":"/Sy6e10snhxjOl93sif5MY6+0FNI8ZHrT8CRDB3bzCZm3uicTk7Kqa1ucogzNYb/vtwdJ0BwvC7lElWxCRdUAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e0242ef5a91c9364f82a349883520327797cac1f5c4c0a1e06b8ecbaf72484fb","last_reissued_at":"2026-07-05T03:02:41.119867Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:02:41.119867Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2010.09959","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":"2026-07-05T03:02:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RFz5U/TB796RcGN4FP0YQhzqFoRi/uzVjMst9lsArcbGumi2wRVXjw1QNyF1ItDudpzQKL4UrAjamXfnYC2SAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-21T11:07:09.885393Z"},"content_sha256":"fcbe2e084e7153eb0a0c7793713d04da06f7f78a03267b5ae487f68a6da1f7df","schema_version":"1.0","event_id":"sha256:fcbe2e084e7153eb0a0c7793713d04da06f7f78a03267b5ae487f68a6da1f7df"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:4ASC55NJDSJWJ6BKGSMIGUQDE5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Engineering Purely Nonlinear Coupling with the Quarton","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Gregory Cunningham, Kaidong Peng, Kevin P. O'Brien, Mahdi Naghiloo, Yufeng Ye","submitted_at":"2020-10-20T02:03:16Z","abstract_excerpt":"Strong nonlinear coupling of superconducting qubits and/or photons is a critical building block for quantum information processing. Due to the perturbative nature of the Josephson nonlinearity, linear coupling is often used in the dispersive regime to approximate nonlinear coupling. However, this dispersive coupling is weak and the underlying linear coupling mixes the local modes which, for example, distributes unwanted self-Kerr to photon modes. Here, we use the quarton to yield purely nonlinear coupling between two linearly decoupled transmon qubits. The quarton's zero $\\phi^2$ potential ena"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2010.09959","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2010.09959/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":"2026-07-05T03:02:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Wk2nbUUnC8kKnffbh1bvdkg0BbM48VCXWr+6f3OQrb41sObv80PnguYr1UYROmlYOlX2CY7A+5LO9lwhIa9WCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-21T11:07:09.885922Z"},"content_sha256":"c2c9ab0d54b6fed81c18ed8316a24c6853cdcc7c3fb6983a5dd30fa6fe3481c4","schema_version":"1.0","event_id":"sha256:c2c9ab0d54b6fed81c18ed8316a24c6853cdcc7c3fb6983a5dd30fa6fe3481c4"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4ASC55NJDSJWJ6BKGSMIGUQDE5/bundle.json","state_url":"https://pith.science/pith/4ASC55NJDSJWJ6BKGSMIGUQDE5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4ASC55NJDSJWJ6BKGSMIGUQDE5/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":"2026-08-21T11:07:09Z","links":{"resolver":"https://pith.science/pith/4ASC55NJDSJWJ6BKGSMIGUQDE5","bundle":"https://pith.science/pith/4ASC55NJDSJWJ6BKGSMIGUQDE5/bundle.json","state":"https://pith.science/pith/4ASC55NJDSJWJ6BKGSMIGUQDE5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4ASC55NJDSJWJ6BKGSMIGUQDE5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:4ASC55NJDSJWJ6BKGSMIGUQDE5","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":"234338392ed540bb167f9325b33ba524a7f0616264195985ffb4ed0f57148101","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-10-20T02:03:16Z","title_canon_sha256":"bb3f6ecd5c98c06dd424f2fcc0c0b4ec705e7e6478f73aeff8e621944aa0400a"},"schema_version":"1.0","source":{"id":"2010.09959","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2010.09959","created_at":"2026-07-05T03:02:41Z"},{"alias_kind":"arxiv_version","alias_value":"2010.09959v2","created_at":"2026-07-05T03:02:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2010.09959","created_at":"2026-07-05T03:02:41Z"},{"alias_kind":"pith_short_12","alias_value":"4ASC55NJDSJW","created_at":"2026-07-05T03:02:41Z"},{"alias_kind":"pith_short_16","alias_value":"4ASC55NJDSJWJ6BK","created_at":"2026-07-05T03:02:41Z"},{"alias_kind":"pith_short_8","alias_value":"4ASC55NJ","created_at":"2026-07-05T03:02:41Z"}],"graph_snapshots":[{"event_id":"sha256:c2c9ab0d54b6fed81c18ed8316a24c6853cdcc7c3fb6983a5dd30fa6fe3481c4","target":"graph","created_at":"2026-07-05T03:02:41Z","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/2010.09959/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Strong nonlinear coupling of superconducting qubits and/or photons is a critical building block for quantum information processing. Due to the perturbative nature of the Josephson nonlinearity, linear coupling is often used in the dispersive regime to approximate nonlinear coupling. However, this dispersive coupling is weak and the underlying linear coupling mixes the local modes which, for example, distributes unwanted self-Kerr to photon modes. Here, we use the quarton to yield purely nonlinear coupling between two linearly decoupled transmon qubits. The quarton's zero $\\phi^2$ potential ena","authors_text":"Gregory Cunningham, Kaidong Peng, Kevin P. O'Brien, Mahdi Naghiloo, Yufeng Ye","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-10-20T02:03:16Z","title":"Engineering Purely Nonlinear Coupling with the Quarton"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2010.09959","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:fcbe2e084e7153eb0a0c7793713d04da06f7f78a03267b5ae487f68a6da1f7df","target":"record","created_at":"2026-07-05T03:02:41Z","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":"234338392ed540bb167f9325b33ba524a7f0616264195985ffb4ed0f57148101","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-10-20T02:03:16Z","title_canon_sha256":"bb3f6ecd5c98c06dd424f2fcc0c0b4ec705e7e6478f73aeff8e621944aa0400a"},"schema_version":"1.0","source":{"id":"2010.09959","kind":"arxiv","version":2}},"canonical_sha256":"e0242ef5a91c9364f82a349883520327797cac1f5c4c0a1e06b8ecbaf72484fb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e0242ef5a91c9364f82a349883520327797cac1f5c4c0a1e06b8ecbaf72484fb","first_computed_at":"2026-07-05T03:02:41.119867Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:02:41.119867Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/Sy6e10snhxjOl93sif5MY6+0FNI8ZHrT8CRDB3bzCZm3uicTk7Kqa1ucogzNYb/vtwdJ0BwvC7lElWxCRdUAw==","signature_status":"signed_v1","signed_at":"2026-07-05T03:02:41.120303Z","signed_message":"canonical_sha256_bytes"},"source_id":"2010.09959","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fcbe2e084e7153eb0a0c7793713d04da06f7f78a03267b5ae487f68a6da1f7df","sha256:c2c9ab0d54b6fed81c18ed8316a24c6853cdcc7c3fb6983a5dd30fa6fe3481c4"],"state_sha256":"cf455299f1da29b15795623c8448e38916486239462a0b2a31e68ee02b108872"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5aSpqkh2LzXHpNc7SKt5b29eiGMgwmzC02LS7j8b49g6B3K5hBd7yqf63qo6EtHbxMIPI8vDQGzy+0ep2EtyBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-21T11:07:09.889493Z","bundle_sha256":"91fb5bbacd4b994932f568f8dbc37cb633ef75911184c71e7c4790f7d43d3c34"}}