qib.operator.control_instructions.BarrierInstruction¶

class qib.operator.control_instructions.BarrierInstruction(qubits: Sequence[Qubit] = [])[source]¶

A barrier instruction for a quantum circuit.

The barrier instruction prevents the quantum processor from executing any further instructions until all qubits have reached the barrier.

Methods

`as_matrix`	Instructions in quantum circuits do not have a sparse matrix representation, because they are not quantum operations that act on the state of qubits.
`as_qasm`	Generate a Qobj OpenQASM representation of the instruction.
`fields`	List of all fields appearing in the instruction.
`is_hermitian`	A control instruction is never Hermitian.
`is_unitary`	A control instruction is never unitary.
`on`	Apply the instruction on the specified qubits.
`particles`	Return the list of quantum particles the instruction is applied on.

Attributes

The number of "wires" (or quantum particles) this instruction is applied on.

as_matrix()[source]¶: Instructions in quantum circuits do not have a sparse matrix representation, because they are not quantum operations that act on the state of qubits. Instead, these instructions serve as control directives within a quantum circuit.

as_qasm()[source]¶: Generate a Qobj OpenQASM representation of the instruction.

fields()[source]¶: List of all fields appearing in the instruction. If empty, all fields of the circuit appears in the instruction.

property num_wires¶: The number of “wires” (or quantum particles) this instruction is applied on. If 0, the barrier is applied on all “wires” of the circuit.

on(qubits: Sequence[Qubit] = [])[source]¶: Apply the instruction on the specified qubits. If left empty, the instruction is applied on all qubits of the circuit.

particles()[source]¶: Return the list of quantum particles the instruction is applied on. If empty, the barrier is applied on all particles of the circuit.