TwoQubitReduction
class qiskit.opflow.converters.TwoQubitReduction(num_particles)
Bases: ConverterBase
Deprecated: 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.
The class qiskit.opflow.converters.two_qubit_reduction.TwoQubitReduction is deprecated as of qiskit-terra 0.24.0. It will be removed in the Qiskit 1.0 release. For code migration guidelines, visit https://qisk.it/opflow_migration(opens in a new tab).
Parameters
num_particles (int(opens in a new tab) |List(opens in a new tab)[int(opens in a new tab)] | Tuple(opens in a new tab)[int(opens in a new tab), int(opens in a new tab)]) – number of particles, if it is a list, the first number is alpha and the second number if beta.
Methods
convert
convert(operator)
Converts the Operator to tapered one by Z2 symmetries.
Parameters
operator (OperatorBase) – the operator
Returns
A new operator whose qubit number is reduced by 2.
Return type