Optimal demonstration of Autler Townes splitting

TL;DR

This paper demonstrates an optimized method to observe Autler-Townes splitting in a diamond NV center system, revealing quantum interference effects and doubling the signal strength compared to traditional techniques.

Contribution

The authors introduce a quantum state manipulation approach to optimally demonstrate ATS, overcoming dephasing effects and revealing new quantum interference phenomena.

Findings

Successful recovery of ATS in a dephasing-dominated system

Identification of nontrivial quantum interference with geometric phase modulations

Signal intensity of ATS doubled using the optimal method

Abstract

The atom-light interaction in a three-level system has shown significant physical phenomena, such as electromagnetically induced transparency and Autler{Townes splitting (ATS), for broad applications in classical and quantum information techniques. Here, we optimally demonstrated the ATS with a quantum state manipulation method. The ATS in the dephasing-dominated diamond NV center system was successfully recovered by coherent microwave control, which cannot be observed with traditional method. The dynamical process of ATS was investigated in detail, revealing a nontrivial quantum interference with geometric phase modulations. Based on the quantum interference, the signal of the optimal ATS is twice as intense as those with traditional observation method.