Quantum interferometry via a coherent state mixed with a squeezed number state
Hou Li-Li1, Sui Yong-Xing1, Wang Shuai1, †, Xu Xue-Fen2, ‡
       

Plots of the phase uncertainty versus total average photon at φ = 10 − 4 for both the SNS-coherent state and the SVS-coherent state, along with the corresponding curves for the SNL and the HL limits. Only the parameter z is being changed. (a) Given the initial squeezing parameter r=0.6; (b) Given n ¯ SNS = n ¯ SVS .