The Heisenberg-Weyl-parity group its coherent states and a unified Wigner-Weyl function

TL;DR

This paper introduces the Heisenberg-Weyl-parity group, explores its properties and coherent states, and demonstrates how it unifies the Wigner and Weyl functions in quantum phase space analysis.

Contribution

It extends the Heisenberg-Weyl group to include parity, defines new coherent states, and unifies Wigner and Weyl functions within this framework.

Findings

HWP(d) is a solvable, generalized dihedral group.

Introduces 2d^2 coherent states related to HWP(d).

Unified Wigner-Weyl function derived from HWP(d).

Abstract

The Heisenberg-Weyl group $HW(d)$ related to a $d$-dimensional Hilbert space $H(d)$, is enlarged into the Heisenberg-Weyl-parity group $HWP(d)$ that incorporates parity transformations. It consists of $2d^3$ elements, of which $d^3$ elements belong to the $HW(d)$ subgroup, and extra $d^3$ elements which are related through a Fourier transform with the former ones. It is shown that $HWP(d)$ is a generalised version of the dihedral group. The properties of operators that combine displacements and parity, are discussed. $HWP(d)$ is shown to be a solvable group, and commutators of its elements perform displacement and parity transformations of quantum states, along loops in the discrete phase space.$2d^2$ coherent states related to the $HWP(d)$ group are introduced, which consist of $d^2$ coherent states related to the $HW(d)$ subgroup, and extra $d^2$ coherent states which are related through a Fourier transform with the former ones. In noisy cases, expansion of an arbitrary state in terms of the $2d^2$ coherent states with Bargmann coefficients, is advantageous in comparison to expansion in terms of the $d^2$ coherent states related to $HW(d)$. One of the consequences of the $HWP(d)$ group, is a natural unification of the Wigner and Weyl functions. The properties of the unified Wigner-Weyl function are discussed.