qiskit.providers.aer.extensions.SnapshotExpectationValue

class SnapshotExpectationValue(label, op, single_shot=False, variance=False)

Snapshot instruction for supported methods of Qasm simulator.

Create an expectation value snapshot instruction.

パラメータ

• label (str) – the snapshot label.

• op (Operator) – operator to snapshot.

• single_shot (bool) – return list for each shot rather than average [Default: False]

• variance (bool) – compute variance of values [Default: False]

例外

ExtensionError – if snapshot is invalid.

注釈

This instruction will be deprecated after the qiskit-aer 0.8 release. It has been superseded by the qiskit.providers.aer.library.SaveExpectationValue and qiskit.providers.aer.library.SaveExpectationValueVariance instructions.

__init__(label, op, single_shot=False, variance=False)

Create an expectation value snapshot instruction.

パラメータ

• label (str) – the snapshot label.

• op (Operator) – operator to snapshot.

• single_shot (bool) – return list for each shot rather than average [Default: False]

• variance (bool) – compute variance of values [Default: False]

例外

ExtensionError – if snapshot is invalid.

注釈

This instruction will be deprecated after the qiskit-aer 0.8 release. It has been superseded by the qiskit.providers.aer.library.SaveExpectationValue and qiskit.providers.aer.library.SaveExpectationValueVariance instructions.

Methods

__init__(label, op[, single_shot, variance])	Create an expectation value snapshot instruction.
add_decomposition(decomposition)	Add a decomposition of the instruction to the SessionEquivalenceLibrary.
assemble()	Assemble a QasmQobjInstruction for snapshot_expectation_value.
broadcast_arguments(qargs, cargs)	Validation of the arguments.
c_if(classical, val)	Add classical condition on register or cbit classical and value val.
copy([name])	Copy of the instruction.
define_snapshot_register(circuit[, label, …])	Defines qubits to snapshot for all snapshot methods
inverse()	Special case.
is_parameterized()	Return True .IFF.
mirror()	DEPRECATED: use instruction.reverse_ops().
qasm()	Return a default OpenQASM string for the instruction.
repeat(n)	Creates an instruction with gate repeated n amount of times.
reverse_ops()	For a composite instruction, reverse the order of sub-instructions.
soft_compare(other)	Soft comparison between gates.
validate_parameter(parameter)	Instruction parameters has no validation or normalization.

Attributes

decompositions	Get the decompositions of the instruction from the SessionEquivalenceLibrary.
definition	Return definition in terms of other basic gates.
duration	Get the duration.
label	Return snapshot label
params	return instruction params.
snapshot_type	Return snapshot type
unit	Get the time unit of duration.

add_decomposition(decomposition)

Add a decomposition of the instruction to the SessionEquivalenceLibrary.

assemble()

Assemble a QasmQobjInstruction for snapshot_expectation_value.

broadcast_arguments(qargs, cargs)

Validation of the arguments.

パラメータ

• qargs (List) – List of quantum bit arguments.

• cargs (List) – List of classical bit arguments.

列挙

Tuple(List, List) – A tuple with single arguments.

例外

CircuitError – If the input is not valid. For example, the number of arguments does not match the gate expectation.

c_if(classical, val)

Add classical condition on register or cbit classical and value val.

copy(name=None)

Copy of the instruction.

パラメータ

name (str) – name to be given to the copied circuit, if None then the name stays the same.

戻り値

a copy of the current instruction, with the name

updated if it was provided

戻り値の型

qiskit.circuit.Instruction

property decompositions

Get the decompositions of the instruction from the SessionEquivalenceLibrary.

static define_snapshot_register(circuit, label=None, qubits=None)

Defines qubits to snapshot for all snapshot methods

property definition

Return definition in terms of other basic gates.

property duration

Get the duration.

inverse()

Special case. Return self.

is_parameterized()

Return True .IFF. instruction is parameterized else False

property label

Return snapshot label

mirror()

DEPRECATED: use instruction.reverse_ops().

戻り値

a new instruction with sub-instructions

reversed.

戻り値の型

qiskit.circuit.Instruction

property params

return instruction params.

qasm()

Return a default OpenQASM string for the instruction.

Derived instructions may override this to print in a different format (e.g. measure q[0] -> c[0];).

repeat(n)

Creates an instruction with gate repeated n amount of times.

パラメータ

n (int) – Number of times to repeat the instruction

戻り値

Containing the definition.

戻り値の型

qiskit.circuit.Instruction

例外

CircuitError – If n < 1.

reverse_ops()

For a composite instruction, reverse the order of sub-instructions.

This is done by recursively reversing all sub-instructions. It does not invert any gate.

戻り値

a new instruction with

sub-instructions reversed.

戻り値の型

qiskit.circuit.Instruction

property snapshot_type

Return snapshot type

soft_compare(other)

Soft comparison between gates. Their names, number of qubits, and classical bit numbers must match. The number of parameters must match. Each parameter is compared. If one is a ParameterExpression then it is not taken into account.

パラメータ

other (instruction) – other instruction.

戻り値

are self and other equal up to parameter expressions.

戻り値の型

bool

property unit

Get the time unit of duration.

validate_parameter(parameter)

Instruction parameters has no validation or normalization.