qiskit.aqua.operators.legacy.Z2Symmetries.two_qubit_reduction¶
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static
Z2Symmetries.two_qubit_reduction(operator, num_particles)[source]¶ 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
operator (WeightedPauliOperator) – the operator
num_particles (Union(list, int)) – number of particles, if it is a list, the first number is alpha and the second number if beta.
- Returns
a new operator whose qubit number is reduced by 2.
- Return type