Noise-induced energy excitation by a general environment

TL;DR

This paper investigates how general environments cause energy excitation in a quantum Brownian particle, highlighting that energy activation occurs after decoherence and serves as an indicator of entanglement, especially at zero temperature.

Contribution

It demonstrates that energy activation is a post-decoherence phenomenon and links it to system-environment entanglement in quantum systems.

Findings

Energy activation follows decoherence in quantum Brownian motion.

Energy excitation indicates system-environment entanglement at zero temperature.

Both ohmic and non-ohmic environments induce these effects.

Abstract

We analyze the effects that general environments, namely ohmic and non-ohmic, at zero and high temperature induce over a quantum Brownian particle. We state that the evolution of the system can be summarized in terms of two main environmental induced physical phenomena: decoherence and energy activation. In this article we show that the latter is a post-decoherence phenomenon. As the energy is an observable, the excitation process is a direct indication of the system-environment entanglement particularly useful at zero temperature.