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#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
# ANY KIND, either express or implied. See the License for the specific
# language governing permissions and limitations under the License.
from braket.circuits import Circuit, ResultType
[docs]
def validate_circuit_and_shots(circuit: Circuit, shots: int) -> None:
"""Validates if circuit and shots are correct before running on a device
Args:
circuit (Circuit): circuit to validate
shots (int): shots to validate
Raises:
ValueError: If circuit has no instructions; if circuit has a non-gphase instruction; if no
result types specified for circuit and `shots=0`. See `braket.circuit.result_types`;
if circuit has observables that cannot be simultaneously measured and `shots>0`;
or, if `StateVector` or `Amplitude` are specified as result types when `shots>0`.
"""
if not circuit.instructions or all(
not (inst.target or inst.control) for inst in circuit.instructions
):
raise ValueError("Circuit must have at least one non-zero-qubit gate to run on a device")
if not shots and not circuit.result_types:
raise ValueError(
"No result types specified for circuit and shots=0. See `braket.circuits.result_types`"
)
elif shots and circuit.result_types:
if not circuit.observables_simultaneously_measurable:
raise ValueError("Observables cannot be sampled simultaneously")
for rt in circuit.result_types:
if isinstance(rt, (ResultType.Amplitude, ResultType.StateVector)):
raise ValueError("StateVector or Amplitude cannot be specified when shots>0")
elif isinstance(rt, ResultType.Probability):
num_qubits = len(rt.target) or circuit.qubit_count
if num_qubits > 40:
raise ValueError("Probability target must be less than or equal to 40 qubits.")