Protecting the quantum state from a finite temperature decoherence source by parity-time symmetric operation

Abstract

We examine the validity of the parity-time ()-symmetric operation in protecting quantum state and entanglement in the non-zero temperature environment. Special attention is paid to the dependence of quantum fidelity and entanglement on the temperature. In particular, by solving the master equation, we get the exact analytical or numerical simulation expressions of the explicit formulas of protection, showing explicitly that -symmetric operation does indeed help in protecting quantum state from finite temperature decoherence.