题　目：Superradiance, Photon phase diffusion and number squeezed

报告人：Jinwu Ye(叶锦武)

　　　　　Capital Normal University and Penn State University

时　间：8月28日（周六）下午3:00

地　点：李薰楼468室

欢迎参加！

Abstract: 

Recently, strong coupling regimes of BEC atoms inside an optical cavity and superconducting qubits inside a micro-wave circuit cavity were achieved experimentally. The strong coupling regimes in both systems were described by the Dicke model.

Here we study the Cavity transmission spectra by solving the Dicke model by $ 1/ N $ expansion. In the normal state, we find a $ \sqrt{N} $ behavior of the collective Rabi splitting consistent with the experimental data. Inside the superradiant phase, we identify a high frequency mode and also an emergent quantum phase diffusion mode at a finite $ N $ and determine their corresponding spectral weights. We also work out many remarkable experimental consequences of this quantum phase mode such as its low frequency, high spectral weight, photon number squeezing properties and photon statistics.