MCMTVChain¶

class
MCMTVChain
(gate, num_ctrl_qubits, num_target_qubits, label=None)[source]¶ Bases:
qiskit.circuit.library.generalized_gates.mcmt.MCMT
The MCMT implementation using the CCX Vchain.
This implementation requires ancillas but is decomposed into a much shallower circuit than the default implementation in
MCMT
.Expanded Circuit:
Examples:
>>> from qiskit.circuit.library import HGate >>> MCMTVChain(HGate(), 3, 2).draw()
 q_0: ──■────────────────────────■──
│ │
 q_1: ──■────────────────────────■──
│ │
 q_2: ──┼────■──────────────■────┼──
│ │ ┌───┐ │ │
 q_3: ──┼────┼──┤ H ├───────┼────┼──
│ │ └─┬─┘┌───┐ │ │
 q_4: ──┼────┼────┼──┤ H ├──┼────┼──
┌─┴─┐ │ │ └─┬─┘ │ ┌─┴─┐
 q_5: ┤ X ├──■────┼────┼────■──┤ X ├
└───┘┌─┴─┐ │ │ ┌─┴─┐└───┘
 q_6: ─────┤ X ├──■────■──┤ X ├─────
└───┘ └───┘
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 inverse MCMT circuit, which is itself.
Attributes

ancillas
¶ Returns a list of ancilla bits in the order that the registers were added.
 Return type
List
[AncillaQubit
]

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

clbits
¶ Returns a list of classical bits in the order that the registers were added.
 Return type
List
[Clbit
]

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.
 Return type
Union
[ParameterExpression
,float
]

header
= 'OPENQASM 2.0;'¶

instances
= 9¶

label
¶ Get label.

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. Return type
dict

num_ancilla_qubits
¶ Return the number of ancilla qubits required.

num_ancillas
¶ Return the number of ancilla qubits.
 Return type
int

num_clbits
¶ Return number of classical bits.
 Return type
int

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

num_qubits
¶ Return number of qubits.
 Return type
int

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

prefix
= 'circuit'¶

qubits
¶ Returns a list of quantum bits in the order that the registers were added.
 Return type
List
[Qubit
]