Mapper Library

This module provides the boson-to-qubit mappers.

occupation_encoding() maps a BosonOperator in the occupation (Fock) basis, truncating each mode and laying its levels out on qubits as a LevelSpec describes.

A bosonic encoding is not an algebra isomorphism: a bosonic mode’s Fock space is infinite-dimensional and must be truncated first, which breaks the canonical commutation relation on the highest retained level. See occupation_encoding() for the exact statement and its consequences.