Counterdiabatic driving for pseudo- and antipseudo- Hermitian systems

TL;DR

This paper explores counterdiabatic driving in pseudo- and antipseudo-Hermitian quantum systems, establishing conditions for adiabatic evolution and deriving Hamiltonians for systems with real or complex spectra, demonstrated through a three-level system.

Contribution

It introduces a framework for counterdiabatic driving in non-Hermitian systems with different spectral properties, including new conditions and Hamiltonians.

Findings

Adiabatic evolution requires real energy spectrum in non-Hermitian systems.

Derived counterdiabatic Hamiltonians for pseudo- and antipseudo-Hermitian systems.

Achieved perfect population transfer in a non-Hermitian three-level system.

Abstract

In this work, we study the counterdiabatic driving scheme in pseudo- and antipseudo- Hermitian systems. By discussing the adiabatic condition for non-Hermitian system, we show that the adiabatic evolution of state can only be realized in the non-Hermitian system which possesses real energy spectrum. Therefore, the counterdiabatic driving scheme to reproduce an exact evolution of an energy eigenstate needs either real energy spectrum or dropping its parts of dynamic phase and Berry phase. In this sense, we derive the adiabatic conditions and counterdiabatic driving Hamiltonians for the pseudo-Hermitian Hamiltonian which possesses either real or complex energy spectrum and the antipseudo-Hermitian Hamiltonian which possesses either imaginary or complex energy spectrum. We also find the condition to get self-normalized energy eigenstates in pseudo- and antipseudo- Hermitian system and derive the well-defined population of bare states on this energy eigenstate. Our results are illustrated by studying the counterdiabatic driving for a non-Hermitian three level system, and a perfect population transfer with loss or gain is realized.