MCMTVChain
class MCMTVChain(gate, num_ctrl_qubits, num_target_qubits, label=None)
Bases: qiskit.circuit.library.generalized_gates.mcmt.MCMT
The MCMT implementation using the CCX V-chain.
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 multi-control multi-target 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 C-name 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
inverse
MCMTVChain.inverse()
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 list-like 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
Default value: 'include "qelib1.inc";'
global_phase
Return the global phase of the circuit in radians.
Return type
Union[ParameterExpression, float]
header
Default value: 'OPENQASM 2.0;'
instances
Default value: 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
Default value: 'circuit'
qubits
Returns a list of quantum bits in the order that the registers were added.
Return type
List[Qubit]