Ramsey spectroscopy with squeezed light

TL;DR

This paper introduces a novel Ramsey spectroscopy scheme utilizing squeezed light and joint detection to surpass traditional resolution limits, achieving a resolution of π/T instead of 2π/T.

Contribution

The authors demonstrate a new Ramsey spectroscopy method using entangled squeezed states and joint detection to enhance frequency resolution beyond classical limits.

Findings

Achieves higher frequency resolution of π/T

Uses two-mode squeezed light with strong entanglement

Surpasses traditional Ramsey spectroscopy resolution

Abstract

Traditional Ramsey spectroscopy has the frequency resolution $2\pi/T$, where $T$ is the time separation between two light fields. Using squeezed states and two-atom excitation joint detection, we present a new scheme achieving a higher resolution $\pi/T$. We use two mode squeezed light which exhibits strong entanglement.