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perf(#52): cache average gate error rates in CostModel #104

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Merged
Manideep3969 merged 1 commit into from
Aug 20, 2026
Merged

perf(#52): cache average gate error rates in CostModel #104

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20 changes: 16 additions & 4 deletions src/qc_compiler/cost_model.py
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Original file line number Diff line number Diff line change
Expand Up @@ -124,6 +124,8 @@ def __init__(self, backend=None):
idealized model.
"""
self.device = self._load_device_characterization(backend)
self._cached_avg_single_qubit_error = None
self._cached_avg_two_qubit_error = None

def _load_device_characterization(self, backend) -> DeviceCharacterization:
"""Load device calibration data from a backend.
Expand Down Expand Up @@ -346,19 +348,29 @@ def _get_gate_fidelity_for_pair(

def _avg_single_qubit_error(self) -> float:
"""Compute average single-qubit gate error across all qubits."""
if self._cached_avg_single_qubit_error is not None:
return self._cached_avg_single_qubit_error

if not self.device.single_qubit_gate_errors:
return DEFAULT_SINGLE_QUBIT_ERROR
self._cached_avg_single_qubit_error = DEFAULT_SINGLE_QUBIT_ERROR
return self._cached_avg_single_qubit_error

errors = list(self.device.single_qubit_gate_errors.values())
return sum(errors) / len(errors)
self._cached_avg_single_qubit_error = sum(errors) / len(errors)
return self._cached_avg_single_qubit_error

def _avg_two_qubit_error(self) -> float:
"""Compute average two-qubit gate error across all qubit pairs."""
if self._cached_avg_two_qubit_error is not None:
return self._cached_avg_two_qubit_error

if not self.device.two_qubit_gate_errors:
return DEFAULT_TWO_QUBIT_ERROR
self._cached_avg_two_qubit_error = DEFAULT_TWO_QUBIT_ERROR
return self._cached_avg_two_qubit_error

errors = list(self.device.two_qubit_gate_errors.values())
return sum(errors) / len(errors)
self._cached_avg_two_qubit_error = sum(errors) / len(errors)
return self._cached_avg_two_qubit_error

def estimate_decoherence_error(
self, circuit: QuantumCircuit, layout: dict | None = None
Expand Down
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