Merge pull request #385 from QunaSys/fix-star-arch-cost-calcs

Fixed an error in STAR device where physical error rate exceed a certain value
QunaSys · Nov 1, 2024 · 5ded408 · 5ded408 · github-actions · Nov 1, 2024
2 parents ffbeddb + 26a1def
commit 5ded408
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/packages/core/quri_parts/backend/devices/star_device.py b/packages/core/quri_parts/backend/devices/star_device.py
@@ -48,7 +48,7 @@ def logical_error_model(ci: float, pthi: float, p: float, d: int) -> float:
     def logical_error_round(p: float, d: int) -> float:
         plz = logical_error_model(ci=0.067976, pthi=0.0038510, p=p, d=d)
         plx = logical_error_model(ci=0.081997, pthi=0.0041612, p=p, d=d)
-        return plz + plx
+        return min(plz + plx, 1.0)
 
     logical_fidelity_round = 1.0 - logical_error_round(
         p=physical_error_rate, d=code_distance