Ultrasensitive Atomic clock with single-mode number-squeezing

TL;DR

This paper demonstrates that atomic clock sensitivity can be improved beyond shot-noise limits using single-mode number-squeezing and quantum non-demolition measurements, simplifying experimental procedures.

Contribution

It introduces a method to enhance atomic clock sensitivity via single-mode squeezing, reducing complexity compared to traditional two-mode approaches.

Findings

Sensitivity surpasses shot-noise level with single-mode squeezing

Single-mode quantum non-demolition measurement improves clock precision

Simplifies experimental protocols for atomic clocks

Abstract

We show that the sensitivity of an atomic clock can be enhanced below the shot-noise level by initially squeezing, and then measuring in output, the population of a single atomic level. This can simplify current experimental protocols which requires squeezing of the relative number of particles of the two populated states. We finally study, as a specific application, the clock sensitivity obtained with a single mode quantum non-demolition measurement.