{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:H3JCV35O7ZTO7XZWYMVOH77YLJ","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":"ada9de2255f45caa85ec93564def42a5e5979f6fb3697b778ff7049afba581b2","cross_cats_sorted":["cs.ET"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-06-03T19:46:35Z","title_canon_sha256":"8e765ced0b0b24ef842576b8791c24111c1b9abc6d54ba5bca98b734c33b95a5"},"schema_version":"1.0","source":{"id":"2606.05387","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.05387","created_at":"2026-06-05T00:13:56Z"},{"alias_kind":"arxiv_version","alias_value":"2606.05387v1","created_at":"2026-06-05T00:13:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.05387","created_at":"2026-06-05T00:13:56Z"},{"alias_kind":"pith_short_12","alias_value":"H3JCV35O7ZTO","created_at":"2026-06-05T00:13:56Z"},{"alias_kind":"pith_short_16","alias_value":"H3JCV35O7ZTO7XZW","created_at":"2026-06-05T00:13:56Z"},{"alias_kind":"pith_short_8","alias_value":"H3JCV35O","created_at":"2026-06-05T00:13:56Z"}],"graph_snapshots":[{"event_id":"sha256:6008463b6383f0e958416974c7ff34f1c044a0bd564c1fdd03b6b383243cd598","target":"graph","created_at":"2026-06-05T00:13:56Z","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/2606.05387/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The encoding of classical data into quantum states constitutes the primary performance bottleneck in Quantum Machine Learning (qml) on Noisy Intermediate-Scale Quantum (nisq) devices. No existing framework jointly characterises resource cost, expressivity, and noise robustness, nor provides actionable selection guidelines for practitioners. This survey addresses that gap through a systematic review of 66 primary works (2017-2026) assembled via a PRISMA-adapted protocol across five academic databases. Four principal contributions are made. First, a three-axis cost-expressivity-robustness taxono","authors_text":"Vincenzo Sammartino","cross_cats":["cs.ET"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-06-03T19:46:35Z","title":"Feature Encoding in Quantum Machine Learning: A Survey and Practical Guidelines"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.05387","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":"sha256:60dfe737995678c1e3c1ee41d2efe19e2cfd9c675d3c2499059346fad5e25060","target":"record","created_at":"2026-06-05T00:13:56Z","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":"ada9de2255f45caa85ec93564def42a5e5979f6fb3697b778ff7049afba581b2","cross_cats_sorted":["cs.ET"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-06-03T19:46:35Z","title_canon_sha256":"8e765ced0b0b24ef842576b8791c24111c1b9abc6d54ba5bca98b734c33b95a5"},"schema_version":"1.0","source":{"id":"2606.05387","kind":"arxiv","version":1}},"canonical_sha256":"3ed22aefaefe66efdf36c32ae3fff85a4f49cd380517d0f1c6fbeffd9b01745d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3ed22aefaefe66efdf36c32ae3fff85a4f49cd380517d0f1c6fbeffd9b01745d","first_computed_at":"2026-06-05T00:13:56.074801Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-05T00:13:56.074801Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"kDujsUWkOB0a1QHaiQ81kR6mfsdn/4U88Gu/FAqIuZJQ6YJYyslJHXTX5lnrVap9svlZpDFIxqXUQjqPlvM6BQ==","signature_status":"signed_v1","signed_at":"2026-06-05T00:13:56.075225Z","signed_message":"canonical_sha256_bytes"},"source_id":"2606.05387","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:60dfe737995678c1e3c1ee41d2efe19e2cfd9c675d3c2499059346fad5e25060","sha256:6008463b6383f0e958416974c7ff34f1c044a0bd564c1fdd03b6b383243cd598"],"state_sha256":"2d5c51226d5c84902f2e2a367f512a463722533d3e562427a4be8baa8e76313f"}