MultiplierGate
class qiskit.circuit.library.MultiplierGate(num_state_qubits, num_result_qubits=None, label=None)
Bases: Gate
Compute the product of two equally sized qubit registers into a new register.
For two input registers , with qubits each and an output register with qubits, a multiplier performs the following operation
where is the number of bits used to represent the result. To completely store the result of the multiplication without overflow we need bits.
The quantum register (analogously and output register)
for , is associated with the integer value
Parameters
- num_state_qubits (int) – The number of qubits in each of the input registers.
- num_result_qubits (int | None) – The number of result qubits to limit the output to. Default value is
2 * num_state_qubitsto represent any possible result from the multiplication of the two inputs. - name – The name of the circuit.
- label (str | None) –
Raises
- ValueError – If
num_state_qubitsis smaller than 1. - ValueError – If
num_result_qubitsis smaller thannum_state_qubits. - ValueError – If
num_result_qubitsis larger than2 * num_state_qubits.
Attributes
base_class
Get the base class of this instruction. This is guaranteed to be in the inheritance tree of self.
The “base class” of an instruction is the lowest class in its inheritance tree that the object should be considered entirely compatible with for _all_ circuit applications. This typically means that the subclass is defined purely to offer some sort of programmer convenience over the base class, and the base class is the “true” class for a behavioral perspective. In particular, you should not override base_class if you are defining a custom version of an instruction that will be implemented differently by hardware, such as an alternative measurement strategy, or a version of a parametrized gate with a particular set of parameters for the purposes of distinguishing it in a Target from the full parametrized gate.
This is often exactly equivalent to type(obj), except in the case of singleton instances of standard-library instructions. These singleton instances are special subclasses of their base class, and this property will return that base. For example:
>>> isinstance(XGate(), XGate)
True
>>> type(XGate()) is XGate
False
>>> XGate().base_class is XGate
TrueIn general, you should not rely on the precise class of an instruction; within a given circuit, it is expected that Instruction.name should be a more suitable discriminator in most situations.
condition
The classical condition on the instruction.
The property qiskit.circuit.instruction.Instruction.condition is deprecated as of Qiskit 1.3.0. It will be removed in 2.0.0.
condition_bits
Get Clbits in condition.
The property qiskit.circuit.instruction.Instruction.condition_bits is deprecated as of Qiskit 1.3.0. It will be removed in 2.0.0.
decompositions
Get the decompositions of the instruction from the SessionEquivalenceLibrary.
definition
Return definition in terms of other basic gates.
duration
Get the duration.
The property qiskit.circuit.instruction.Instruction.duration is deprecated as of Qiskit 1.3.0. It will be removed in Qiskit 2.0.0.
label
Return instruction label
mutable
Is this instance is a mutable unique instance or not.
If this attribute is False the gate instance is a shared singleton and is not mutable.
name
Return the name.
num_clbits
Return the number of clbits.
num_qubits
Return the number of qubits.
num_result_qubits
The number of result qubits to limit the output to.
Returns
The number of result qubits.
num_state_qubits
The number of state qubits, i.e. the number of bits in each input register.
Returns
The number of state qubits.
params
The parameters of this Instruction. Ideally these will be gate angles.
unit
Get the time unit of duration.
The property qiskit.circuit.instruction.Instruction.unit is deprecated as of Qiskit 1.3.0. It will be removed in Qiskit 2.0.0.