Probing internal bath dynamics by a Rabi oscillator-based detector

TL;DR

This paper demonstrates how a central spin-1/2 can be used as a detector to probe the internal dynamics of a bath by analyzing Rabi oscillations and fidelity behavior, revealing intra-bath coupling strengths.

Contribution

It introduces a method to use a Rabi oscillator-based detector for probing internal bath dynamics through numerical and master equation analysis.

Findings

Rabi oscillations are sensitive to bath self-interactions.

Fidelity exhibits periodic behavior linked to bath dynamics.

Intra-bath coupling can be quantitatively estimated.

Abstract

By exact numerical and master equation approaches, we show that a central spin-1/2 can be configured to probe internal bath dynamics. System-bath interactions cause Rabi oscillations in the detector and periodic behavior of fidelity. This period is highly sensitive to the strength of the bath self-interactions, and can be used to calculate the intra-bath coupling.