{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:I6U6P5RWRYVDM6E66OZ5HCZGST","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":"2e23559b8590a27ad5e1bd88e70bd7361cbcca60606d42f7b554fdd5fd316b7c","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-09-25T10:42:59Z","title_canon_sha256":"f42175ca0b61ae6d2614355744d95313363bbec863543e5a857b7e9b5d44c83e"},"schema_version":"1.0","source":{"id":"1909.11397","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.11397","created_at":"2026-07-05T01:13:54Z"},{"alias_kind":"arxiv_version","alias_value":"1909.11397v1","created_at":"2026-07-05T01:13:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.11397","created_at":"2026-07-05T01:13:54Z"},{"alias_kind":"pith_short_12","alias_value":"I6U6P5RWRYVD","created_at":"2026-07-05T01:13:54Z"},{"alias_kind":"pith_short_16","alias_value":"I6U6P5RWRYVDM6E6","created_at":"2026-07-05T01:13:54Z"},{"alias_kind":"pith_short_8","alias_value":"I6U6P5RW","created_at":"2026-07-05T01:13:54Z"}],"graph_snapshots":[{"event_id":"sha256:1b237a688f1fd8f8a087e4c0142160bf42e0b7494137dbf595915adc0feb9a12","target":"graph","created_at":"2026-07-05T01:13:54Z","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/1909.11397/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The manipulation fidelity of a single electron qubit gate-confined in a $^{28}$Si/SiGe quantum dot has recently been drastically improved by nuclear isotope purification. Here, we identify the dominant source for low-frequency qubit detuning noise in a device with an embedded nanomagnet, a remaining $^{29}$Si concentration of only 60$\\,$ppm in the strained $^{28}$Si quantum well layer and a spin echo decay time $T_2^{\\text{echo}}=128\\,\\mu$s. The power spectral density (PSD) of the charge noise explains both the observed transition of a $1/f^2$- to a $1/f$-dependence of the detuning noise PSD a","authors_text":"Andreas Schmidbauer, Arne Hollmann, Dominique Bougeard, Floyd Schauer, Helge Riemann, Kentarou Sawano, Lars R. Schreiber, {\\L}ukasz Cywi\\'nski, Nikolay V. Abrosimov, Olexiy Fedorets, Tom Struck","cross_cats":["cond-mat.mes-hall"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-09-25T10:42:59Z","title":"Low-frequency spin qubit detuning noise in highly purified $^{28}$Si/SiGe"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.11397","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":"sha256:73bbc95ef1123219b76e5d934d183039f065c18604f87c49895dab3dd2280799","target":"record","created_at":"2026-07-05T01:13:54Z","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":"2e23559b8590a27ad5e1bd88e70bd7361cbcca60606d42f7b554fdd5fd316b7c","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-09-25T10:42:59Z","title_canon_sha256":"f42175ca0b61ae6d2614355744d95313363bbec863543e5a857b7e9b5d44c83e"},"schema_version":"1.0","source":{"id":"1909.11397","kind":"arxiv","version":1}},"canonical_sha256":"47a9e7f6368e2a36789ef3b3d38b2694f81a8ceda711436aadf3a98d5528cca6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"47a9e7f6368e2a36789ef3b3d38b2694f81a8ceda711436aadf3a98d5528cca6","first_computed_at":"2026-07-05T01:13:54.800719Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:13:54.800719Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8BTYu3+OQs0Q5aRHd+b0JU1Q+TVoVWU4XCrKFzyCQf7uTPuSNqlq+U+V2A8vz3PEv5ekl1aeGL85e1DNMt3OCg==","signature_status":"signed_v1","signed_at":"2026-07-05T01:13:54.801161Z","signed_message":"canonical_sha256_bytes"},"source_id":"1909.11397","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:73bbc95ef1123219b76e5d934d183039f065c18604f87c49895dab3dd2280799","sha256:1b237a688f1fd8f8a087e4c0142160bf42e0b7494137dbf595915adc0feb9a12"],"state_sha256":"e077d56d539bc3d77ad3c4e89eafdd5caa4cba91e1480911191fea2d7b2ec7d9"}