UnitarySimulator

class UnitarySimulator(configuration=None, properties=None, provider=None, **backend_options)

Bases: qiskit.providers.aer.backends.aerbackend.AerBackend

Ideal quantum circuit unitary simulator.

Configurable Options

The UnitarySimulator supports CPU and GPU simulation methods and additional configurable options. These may be set using the appropriate kwargs during initialization. They can also be set of updated using the set_options() method.

Run-time options may also be specified as kwargs using the run() method. These will not be stored in the backend and will only apply to that execution. They will also override any previously set options.

For example, to configure a a single-precision simulator

backend = UnitarySimulator(precision='single')

Backend Options

The following configurable backend options are supported

• device (str): Set the simulation device (Default: "CPU"). Use available_devices() to return a list of devices supported on the current system.

• method (str): [DEPRECATED] Set the simulation method supported methods are "unitary" for CPU simulation, and "unitary_gpu" for GPU simulation. This option has been deprecated, use the device option to set "CPU" or "GPU" simulation instead.

• precision (str): Set the floating point precision for certain simulation methods to either "single" or "double" precision (default: "double").

• executor (futures.Executor): Set a custom executor for asynchronous running of simulation jobs (Default: None).

• max_shot_size (int or None): If the number of shots of a noisy circuit exceeds this value simulation will be split into multi circuits for execution and the results accumulated. If None circuits will not be split based on shots. When splitting circuits use the max_job_size option to control how these split circuits should be submitted to the executor (Default: None).

• max_shot_size (int or None): If the number of shots with a noise model exceeds this value, simulation will split the experiments into sub experiments in the qobj. If None simulator does nothing (Default: None).

• "initial_unitary" (matrix_like): Sets a custom initial unitary matrix for the simulation instead of identity (Default: None).

• "validation_threshold" (double): Sets the threshold for checking if initial unitary and target unitary are unitary matrices. (Default: 1e-8).

• "zero_threshold" (double): Sets the threshold for truncating small values to zero in the result data (Default: 1e-10).

• "max_parallel_threads" (int): Sets the maximum number of CPU cores used by OpenMP for parallelization. If set to 0 the maximum will be set to the number of CPU cores (Default: 0).

• "max_parallel_experiments" (int): Sets the maximum number of qobj experiments that may be executed in parallel up to the max_parallel_threads value. If set to 1 parallel circuit execution will be disabled. If set to 0 the maximum will be automatically set to max_parallel_threads (Default: 1).

• "max_memory_mb" (int): Sets the maximum size of memory to store a state vector. If a state vector needs more, an error is thrown. In general, a state vector of n-qubits uses 2^n complex values (16 Bytes). If set to 0, the maximum will be automatically set to the system memory size (Default: 0).

• "statevector_parallel_threshold" (int): Sets the threshold that 2 * "n_qubits" must be greater than to enable OpenMP parallelization for matrix multiplication during execution of an experiment. If parallel circuit or shot execution is enabled this will only use unallocated CPU cores up to max_parallel_threads. Note that setting this too low can reduce performance (Default: 14).

These backend options apply in circuit optimization passes:

• fusion_enable (bool): Enable fusion optimization in circuit optimization passes [Default: True]

• fusion_verbose (bool): Output gates generated in fusion optimization into metadata [Default: False]

• fusion_max_qubit (int): Maximum number of qubits for a operation generated in a fusion optimization [Default: 5]

• fusion_threshold (int): Threshold that number of qubits must be greater than or equal to enable fusion optimization [Default: 7]

Aer class for backends.

This method should initialize the module and its configuration, and raise an exception if a component of the module is not available.

প্যারামিটার

• configuration (BackendConfiguration) -- backend configuration.

• properties (BackendProperties or None) -- Optional, backend properties.

• defaults (PulseDefaults or None) -- Optional, backend pulse defaults.

• provider (Provider) -- Optional, provider responsible for this backend.

• backend_options (dict or None) -- Optional set custom backend options.

রেইজেস

AerError -- if there is no name in the configuration

Methods

available_devices	Return the available simulation methods.
available_methods	Return the available simulation methods.
clear_options	Reset the simulator options to default values.
configuration	Return the simulator backend configuration.
defaults	Return the simulator backend pulse defaults.
name	Return the backend name.
properties	Return the simulator backend properties if set.
provider	Return the backend Provider.
run	Run a qobj on the backend.
set_option	Special handling for setting backend options.
set_options	Set the simulator options
status	Return backend status.

Attributes

options

Return the options for the backend

The options of a backend are the dynamic parameters defining how the backend is used. These are used to control the run() method.

version = 1