MCMT¶

class
MCMT
(gate, num_ctrl_qubits, num_target_qubits, label=None)[source]¶ Bases:
qiskit.circuit.quantumcircuit.QuantumCircuit
The multicontrolled multitarget gate, for an arbitrary singly controlled target gate.
For example, the H gate controlled on 3 qubits and acting on 2 target qubit is represented as:
───■──── │ ───■──── │ ───■──── ┌──┴───┐ ┤0 ├ │ 2H │ ┤1 ├ └──────┘
This default implementations requires no ancilla qubits, by broadcasting the target gate to the number of target qubits and using Qiskit’s generic control routine to control the broadcasted target on the control qubits. If ancilla qubits are available, a more efficient variant using the socalled Vchain decomposition can be used. This is implemented in
MCMTVChain
.Create a new multicontrol multitarget gate.
 Parameters
gate (
Union
[Gate
,Callable
[[QuantumCircuit
,Qubit
,Qubit
],Instruction
]]) – The gate to be applied controlled on the control qubits and applied to the target qubits. Can be either a Gate or a circuit method. If it is a callable, it will be casted to a Gate.num_ctrl_qubits (
int
) – The number of control qubits.num_target_qubits (
int
) – The number of target qubits.label (
Optional
[str
]) – The name for the controlled circuit block. If None, set to Cname where name is gate.name.
 Raises
AttributeError – If the gate cannot be casted to a controlled gate.
AttributeError – If the number of controls or targets is 0.
Methods Defined Here
Return the controlled version of the MCMT circuit.
Return the inverse MCMT circuit, which is itself.
Attributes

ancillas
¶ Returns a list of ancilla bits in the order that the registers were added.

calibrations
¶ Return calibration dictionary.
 The custom pulse definition of a given gate is of the form
{‘gate_name’: {(qubits, params): schedule}}

clbits
¶ Returns a list of classical bits in the order that the registers were added.

data
¶ Return the circuit data (instructions and context).
 Returns
a listlike object containing the tuples for the circuit’s data.
Each tuple is in the format
(instruction, qargs, cargs)
, where instruction is an Instruction (or subclass) object, qargs is a list of Qubit objects, and cargs is a list of Clbit objects. Return type
QuantumCircuitData

extension_lib
= 'include "qelib1.inc";'¶

global_phase
¶ Return the global phase of the circuit in radians.

header
= 'OPENQASM 2.0;'¶

instances
= 16¶

metadata
¶ The user provided metadata associated with the circuit
The metadata for the circuit is a user provided
dict
of metadata for the circuit. It will not be used to influence the execution or operation of the circuit, but it is expected to be passed between all transforms of the circuit (ie transpilation) and that providers will associate any circuit metadata with the results it returns from execution of that circuit.

num_ancilla_qubits
¶ Return the number of ancillas.

num_ancillas
¶ Return the number of ancilla qubits.

num_clbits
¶ Return number of classical bits.

num_parameters
¶ Convenience function to get the number of parameter objects in the circuit.

num_qubits
¶ Return number of qubits.

parameters
¶ Convenience function to get the parameters defined in the parameter table.

prefix
= 'circuit'¶

qubits
¶ Returns a list of quantum bits in the order that the registers were added.