# Optimal Photon blockade on the maximal atomic coherence

## TL;DR

This paper demonstrates a novel direct relationship between maximal atomic coherence and optimal photon blockade in a cavity QED system, supported by numerical simulations, highlighting the effects of dissipation.

## Contribution

It establishes for the first time a perfect correspondence between atomic coherence and photon blockade, expanding understanding of their interplay in quantum systems.

## Key findings

- Maximal atomic coherence aligns with optimal photon blockade.
- Strong dissipation negatively impacts photon statistics and atomic coherence.
- Numerical simulations support the theoretical results.

## Abstract

There is generally no obvious evidence in any direct relation between photon blockade and atomic coherence. Here instead of only illustrating the photon statistics, we show an interesting relation between the steady-state photon blockade and the atomic coherence by designing a weakly driven cavity QED system with a two-level atom trapped. It is shown for the first time that the maximal atomic coherence has a perfect correspondence with the optimal photon blockade. The negative effects of the strong dissipations on photon statistics, atomic coherence and their correspondence are also addressed. The numerical simulation is also given to support all of our results.