braket.default_simulator.simulation module¶

class
braket.default_simulator.simulation.
Simulation
(qubit_count: int, shots: int)[source]¶ Bases:
object
This class tracks the evolution of a quantum system with
qubit_count
qubits. The state of system the evolves by application ofGateOperation`s using the `evolve()
method.Parameters:  qubit_count (int) – The number of qubits being simulated. All the qubits start in the \(\ket{\mathbf{0}}\) computational basis state.
 shots (int) – The number of samples to take from the simulation. If set to 0, only results that do not require sampling, such as density matrix or expectation, are generated.

qubit_count
¶ The number of qubits being simulated by the simulation.
Type: int

shots
¶ The number of samples to take from the simulation.
0 means no samples are taken, and results that require sampling to calculate cannot be returned.
Type: int

evolve
(operations: List[braket.default_simulator.operation.GateOperation]) → None[source]¶ Evolves the state of the simulation under the action of the specified gate operations.
Parameters: operations (List[GateOperation]) – Gate operations to apply for evolving the state of the simulation. Note
This method mutates the state of the simulation.

expectation
(observable: braket.default_simulator.operation.Observable) → float[source]¶ The expected value of the observable in the given state.
Parameters: observable (Observable) – The observable to measure. Returns: float – The expected value of the observable.

retrieve_samples
() → List[int][source]¶ Retrieves samples of states from the state of the simulation, based on the probabilities.
Returns: List[int] – List of states sampled according to their probabilities in the state. Each integer represents the decimal encoding of the corresponding computational basis state.

probabilities
¶ The probabilities of each computational basis state.
Type: np.ndarray