[OPTICAL REVIEW Vol. 8, No. 6 (2001) 422-430]
Phase Properties of Superposed Squeezed States
Suc-Kyoung HONG1,*, Chung-In UM1 and Kyu-Hwang YEON2
1Department of Physics, College of Science, Korea University, Seoul, 136-701 Korea, 2Department of Physics, Chungbuk National University, Cheong Ju, Chung Buk, 306-763 Korea
(Received November 15, 2000; Accepted October 2, 2001)
The phase properties of the superposed squeezed states are studied. The superposed squeezed states are obtained by inserting two squeezers in a Mach-Zehnder interferometer one for each arm. The visibility of the states as a measure of the coherence of the generated photons in the nonlinear interferometer is analyzed. And the mean-square phase fluctuations are also considered to analyze the phase properties of the superposed squeezed states. The quantities are obtained as a function of gain and the input phase, when the amplified input is a coherent state, a number state, a thermal state, a displaced number state, or a coherent thermal state.
Key words : phase properties, superposed squeezed state, nonlinear Mach-Zehnder interferometer, coherence