Coherence properties of discrete static kinks

TL;DR

This paper investigates the coherence properties of localized modes in static kinks within nonlinear particle chains, showing they can maintain quantum coherence for extended periods, with potential applications in quantum information processing.

Contribution

It provides a numerical analysis of decoherence in localized kink modes, highlighting their potential for quantum information applications in ion traps.

Findings

Low decoherence rates are achievable in kink localized modes.

Localized modes can maintain coherence over long times.

Potential use of kink modes in quantum information processing.

Abstract

A chain of interacting particles subject also to a nonlinear on-site potential admits stable soliton-like configurations : static kinks. The linear normal-modes around such a kink contain a discrete set of localized, gap-separated modes. Quantization of the Hamiltonian in these modes results in an interacting system of phonons. We investigate numerically the coherence properties of such localized modes at low temperatures using a non-Markovian master equation. We show that low decoherence rates can be achieved in these nonlinear configurations for a surprisingly long time. If realized in the ion trap, kink internal modes may be advantageously used for Quantum Information Processing.