TwoQubitReduction
class TwoQubitReduction(num_particles)
Bases: qiskit.opflow.converters.converter_base.ConverterBase
Two qubit reduction converter which eliminates the central and last qubit in a list of Pauli that has diagonal operators (Z,I) at those positions.
Chemistry specific method: It can be used to taper two qubits in parity and binary-tree mapped fermionic Hamiltonians when the spin orbitals are ordered in two spin sectors, (block spin order) according to the number of particles in the system.
Parameters
num_particles (Union[int, List[int], Tuple[int, int]]) – number of particles, if it is a list, the first number is alpha and the second number if beta.
Methods Defined Here
convert
TwoQubitReduction.convert(operator)
Converts the Operator to tapered one by Z2 symmetries.
Parameters
operator (OperatorBase) – the operator
Return type
Returns
A new operator whose qubit number is reduced by 2.