Mappers (qiskit_nature.second_q.mappers)

The classes here are used to convert fermionic, bosonic, vibrational and spin operators to qubit operators.

QubitMapper	The interface for implementing methods which map from a SparseLabelOp to a qubit operator in the form of a SparsePauliOp.
ModeBasedMapper	Mapper from SparseLabelOp to a qubit operator using a Pauli table.

FermionicOp Mappers

BravyiKitaevMapper	The Bravyi-Kitaev fermion-to-qubit mapping.
BravyiKitaevSuperFastMapper	The Bravyi-Kitaev super-fast fermion-to-qubit mapping.
JordanWignerMapper	The Jordan-Wigner fermion-to-qubit mapping.
ParityMapper	The Parity fermion-to-qubit mapping.
TernaryTreeMapper	Ternary Tree fermion-to-qubit mapping.

Note: TernaryTreeMapper maps MajoranaOp to SparsePauliOp. In order to use it on a FermionicOp, convert to a MajoranaOp first using MajoranaOp.from_fermionic_op().

Interleaved Qubit-Ordering: If you want to generate qubit operators where the alpha-spin and beta-spin components are mapped to the qubit register in an interleaved (rather than the default blocked) order, you can use the following wrapper:

InterleavedQubitMapper

A FermionicMapper wrapper returning interleaved-ordered operators.

BosonicOp Mappers

BosonicLinearMapper	The Linear boson-to-qubit mapping.
BosonicLogarithmicMapper	The Logarithmic boson-to-qubit Mapper.

VibrationalOp Mappers

DirectMapper

The Direct mapper.

SpinOp Mappers

LinearMapper	The Linear spin-to-qubit mapping.
LogarithmicMapper	A mapper for Logarithmic spin-to-qubit mapping.

Tapered Qubit Mapper

If you want to make use of the symmetries of your problem and add a step of tapering after the mapping to qubit operators, you can use the following wrapper for symmetry reduction:

TaperedQubitMapper

The wrapper around qubit mappers implementing the logic to reduce the size of a problem (operator) based on mathematical Z2Symmetries that can be automatically detected in the operator.

MixedOp Mappers

MixedMapper

Mapper of a Mixed Operator to a Qubit Operator.