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

The expectation value of the parity operator versus the phase shift φ for both SNS-coherent and SVS-coherent as input states of the MZI, respectively. (a) Given the initial squeezing parameter r=0.6 and z = 10; (b) given n ¯ SNS = n ¯ SVS and z = 10. For a more obvious comparison, we have adjusted the negative central peak value to a positive value.