Skip to main contentIBM Quantum Documentation
You are viewing the API reference for an old version of Qiskit SDK. Switch to latest version

ContinueLoopOp

ContinueLoopOp(num_qubits, num_clbits, label=None) GitHub(opens in a new tab)

Bases: qiskit.circuit.instruction.Instruction

A circuit operation which, when encountered, moves to the next iteration of the nearest enclosing loop.

Note

Can be inserted only within the body of a loop op, and must span the full width of that block.

Circuit symbol:

     ┌─────────────────┐
q_0:0
     │                 │
q_1:1
     │  continue_loop  │
q_2:2
     │                 │
c_0:0
     └─────────────────┘

Create a new instruction.

Parameters

  • name (str) – instruction name
  • num_qubits (int) – instruction’s qubit width
  • num_clbits (int) – instruction’s clbit width
  • params (list[int|float|complex|str|ndarray|list|ParameterExpression]) – list of parameters
  • duration (int or float) – instruction’s duration. it must be integer if unit is ‘dt’
  • unit (str) – time unit of duration
  • label (str or None) – An optional label for identifying the instruction.

Raises

CircuitError – when the register is not in the correct format.


Methods

add_decomposition

ContinueLoopOp.add_decomposition(decomposition)

Add a decomposition of the instruction to the SessionEquivalenceLibrary.

assemble

ContinueLoopOp.assemble()

Assemble a QasmQobjInstruction

broadcast_arguments

ContinueLoopOp.broadcast_arguments(qargs, cargs)

Validation of the arguments.

Parameters

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

Yields

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

Raises

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

c_if

ContinueLoopOp.c_if(classical, val)

Set a classical equality condition on this instruction between the register or cbit classical and value val.

Note

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

ContinueLoopOp.copy(name=None)

Copy of the instruction.

Parameters

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

Returns

a copy of the current instruction, with the name

updated if it was provided

Return type

qiskit.circuit.Instruction

inverse

ContinueLoopOp.inverse()

Invert this instruction.

If the instruction is composite (i.e. has a definition), then its definition will be recursively inverted.

Special instructions inheriting from Instruction can implement their own inverse (e.g. T and Tdg, Barrier, etc.)

Returns

a fresh instruction for the inverse

Return type

qiskit.circuit.Instruction

Raises

CircuitError – if the instruction is not composite and an inverse has not been implemented for it.

is_parameterized

ContinueLoopOp.is_parameterized()

Return True .IFF. instruction is parameterized else False

qasm

ContinueLoopOp.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

ContinueLoopOp.repeat(n)

Creates an instruction with gate repeated n amount of times.

Parameters

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

Returns

Containing the definition.

Return type

qiskit.circuit.Instruction

Raises

CircuitError – If n < 1.

reverse_ops

ContinueLoopOp.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.

Returns

a new instruction with

sub-instructions reversed.

Return type

qiskit.circuit.Instruction

soft_compare

ContinueLoopOp.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.

Parameters

other (instruction) – other instruction.

Returns

are self and other equal up to parameter expressions.

Return type

bool

validate_parameter

ContinueLoopOp.validate_parameter(parameter)

Instruction parameters has no validation or normalization.


Attributes

condition_bits

Get Clbits in condition.

Return type

List[Clbit]

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

Return type

str

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.

Was this page helpful?