Barrier#

class qiskit.circuit.library.Barrier(num_qubits, label=None)[ソース]#

ベースクラス: Instruction

Barrier instruction.

A barrier is a visual indicator of the grouping of a circuit section. It also acts as a directive for circuit compilation to separate pieces of a circuit so that any optimizations or re-writes are constrained to only act between barriers.

Create new barrier instruction.

パラメータ:

num_qubits (int) – the number of qubits for the barrier type [Default: 0].
label (str) – the barrier label

例外:

TypeError – if barrier label is invalid.

Attributes

condition_bits#: Get Clbits in condition.

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 instruction label

name#: Return the name.

num_clbits#: Return the number of clbits.

num_qubits#: Return the number of qubits.

params#: return instruction params.

unit#: Get the time unit of duration.

Methods

add_decomposition(decomposition)#: Add a decomposition of the instruction to the SessionEquivalenceLibrary.

assemble()#: Assemble a QasmQobjInstruction

broadcast_arguments(qargs, cargs)[ソース]#

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)[ソース]#: Set a classical equality condition on this instruction between the register or cbit classical and value val.

注釈

This is a setter method, not an additive one. Calling this multiple times will silently override any previously set condition; it does not stack.

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

inverse()[ソース]#: Special case. Return self.

is_parameterized()#: Return True .IFF. instruction is parameterized else False

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];).

バージョン 0.25.0 で非推奨: The method qiskit.circuit.instruction.Instruction.qasm() is deprecated as of qiskit-terra 0.25.0. It will be removed no earlier than 3 months after the release date. Correct exporting to OpenQASM 2 is the responsibility of a larger exporter; it cannot safely be done on an object-by-object basis without context. No replacement will be provided, because the premise is wrong.

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

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

validate_parameter(parameter)#: Instruction parameters has no validation or normalization.