Quantum decoherence reduction by increasing the thermal bath temperature

TL;DR

This paper demonstrates that increasing the temperature of a non-linear or quantum bath can reduce quantum decoherence, contrary to traditional expectations, due to changes in the bath's spectral profile.

Contribution

It reveals that bath dynamics influence decoherence temperature dependence, showing temperature increase can reduce decoherence in certain quantum environments.

Findings

Decoherence can decrease with temperature in non-linear baths.

Bath spectral profile's temperature dependence causes anomalous decoherence behavior.

Implications for quantum computer design and coherence preservation.

Abstract

The well-known increase of the decoherence rate with the temperature, for a quantum system coupled to a linear thermal bath, holds no longer for a different bath dynamics. This is shown by means of a simple classical non-linear bath, as well as a quantum spin-boson model. The anomalous effect is due to the temperature dependence of the bath spectral profile. The decoherence reduction via the temperature increase can be relevant for the design of quantum computers.