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README.md

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+---
+license: apache-2.0
+task_categories:
+  - other
+tags:
+  - quantum-error-correction
+  - surface-code
+  - willow
+pretty_name: Willow Surface-Code Detection Events
+configs:
+  - config_name: default
+    data_files: data/*.parquet
+---
+
+# Willow Surface-Code Detection Events (ingested)
+
+Detection events and logical-observable flips derived from Google's Willow
+below-threshold surface-code dataset (Zenodo
+[10.5281/zenodo.13273331](https://doi.org/10.5281/zenodo.13273331)), rotated
+surface code at distances 3, 5, 7 in X and Z memory.
+
+Each row is one experimental **shot**. Detection events are derived from the raw
+device measurement records with Stim's measurement-to-detector converter, using
+the per-shot sweep bits, and validated to reproduce the dataset's shipped
+`detection_events.b8` / `obs_flips_actual.b8` **byte-for-byte** for all
+420 configurations.
+
+## Columns
+
+| column | type | meaning |
+|---|---|---|
+| `distance` | int16 | code distance d (3, 5, 7) |
+| `basis` | string | `X` or `Z` memory |
+| `rounds` | int16 | number of QEC cycles |
+| `orientation` | string | patch location label on the chip (e.g. `q4_5`) |
+| `shot` | int32 | shot index within the configuration |
+| `detectors` | list<bool> | which detectors fired (length `num_detectors`, `= 2 * rounds * (d^2-1)/2`) |
+| `observable` | bool | ground-truth logical flip the decoder must predict |
+
+One Parquet shard per `(distance, orientation, basis, rounds)` configuration under
+`data/`. The decoder sees only `detectors`; `observable` is the held-out answer key.
+
+## Load
+
+```python
+from datasets import load_dataset
+ds = load_dataset("ShayManor/willow-surface-code-detection-events", split="train")
+```

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