Suppression of decoherence via strong intra-environmental coupling

TL;DR

This paper demonstrates that strong intra-environmental coupling in a spin-bath model can suppress decoherence of a central impurity spin, which is promising for solid-state quantum device stability.

Contribution

It provides a detailed numerical analysis showing decoherence suppression due to intra-environmental coupling in a spin-bath model at low temperatures.

Findings

Increased intra-environmental coupling suppresses decoherence.

Exact numerical results confirm the decoherence reduction.

Potential implications for quantum computer stability.

Abstract

We examine the effects of intra-environmental coupling on decoherence by constructing a low temperature spin--spin-bath model of an atomic impurity in a Debye crystal. The impurity interacts with phonons of the crystal through anti-ferromagnetic spin-spin interactions. The reduced density matrix of the central spin representing the impurity is calculated by dynamically integrating the full Schroedinger equation for the spin--spin-bath model for different thermally weighted eigenstates of the spin-bath. Exact numerical results show that increasing the intra-environmental coupling results in suppression of decoherence. This effect could play an important role in the construction of solid state quantum devices such as quantum computers.