Compressed state generation during intracavity frequency doubling

Harry J. Kimble, J. L. Hall

Harry J. Kimble, J. L. Hall

А. В. Белинский, A. S. Chirkin

Silvania F. Pereira, Min Xiao, Harry J. Kimble +1 more

Squeezed states of light are generated by the process of second-harmonic conversion within an optical cavity resonant at both fundamental and harmonic frequencies. Observations of squeezing are made by analyzing the spectral density of photocurrent fluctuations produced by the total field reflected from the nonlinear cavity. Reductions in photocurrent noise of 13% relative to the coherent-state or shot-noise level are achieved for frequency offsets near 4 MHz.

Gagik Yu. Kryuchkyan, N.T. Mouradyan, A.S. Sargsian

H. Y. Leng, Jianfeng Wang, Youbin Yu +5 more

We theoretically show that continuous-variable genuine quadripartite entanglement can be generated by intracavity cascaded nonlinear optical interactions. The process consists of a parametric down-conversion, a sum-frequency generation of pump and signal and a sum-frequency generation of pump and idler. The characteristics of the quadripartite entanglement among the signal, the idler, and two sum-frequency modes are analyzed by applying a sufficient inseparability criterion for multipartite continuous-variable entanglement proposed by Van Loock and Furusawa. The threshold properties of the system are also discussed.