# qiskit.providers.aer.extensions.SnapshotStatevector¶

class SnapshotStatevector(label, num_qubits=0)[ソース]

Snapshot instruction for statevector snapshot type

Create a statevector state snapshot instruction.

パラメータ
• label (str) – the snapshot label.

• num_qubits (int) – the instruction barrier size [Default: 0].

ExtensionError – if snapshot is invalid.

This snapshot is always performed on all qubits in a circuit. The number of qubits parameter specifies the size of the instruction as a barrier and should be set to the number of qubits in the circuit.

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 It has been superseded by the qiskit.providers.aer.library.SaveStatevector instruction.

__init__(label, num_qubits=0)[ソース]

Create a statevector state snapshot instruction.

パラメータ
• label (str) – the snapshot label.

• num_qubits (int) – the instruction barrier size [Default: 0].

ExtensionError – if snapshot is invalid.

This snapshot is always performed on all qubits in a circuit. The number of qubits parameter specifies the size of the instruction as a barrier and should be set to the number of qubits in the circuit.

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 It has been superseded by the qiskit.providers.aer.library.SaveStatevector instruction.

Methods

 __init__(label[, num_qubits]) Create a statevector state snapshot instruction. add_decomposition(decomposition) Add a decomposition of the instruction to the SessionEquivalenceLibrary. Assemble a QasmQobjInstruction 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 Special case. Return True .IFF. DEPRECATED: use instruction.reverse_ops(). Return a default OpenQASM string for the instruction. Creates an instruction with gate repeated n amount of times. 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

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.

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

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.

a copy of the current instruction, with the name

updated if it was provided

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().

a new instruction with sub-instructions

reversed.

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

Containing the definition.

qiskit.circuit.Instruction

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.

a new instruction with

sub-instructions reversed.

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.

are self and other equal up to parameter expressions.

bool

property unit

Get the time unit of duration.

validate_parameter(parameter)

Instruction parameters has no validation or normalization.