双模SU（2）相干态光场的位相特性

本文用Ｂａｒｎｅｔｔ－Ｐｅｇｇ位相理论研究了一类具有反关联特性的双模场即ＳＵ（２）相干态场的位相特性．给出了限制在２π范围的位相概率分布函数和方差的表达式，并证明了单个场模的位相及两个场模的位相之和都是随机分布的。结果还表明，当光场较强且两模的平均光子数近似相等时，两模的位相差几乎不变，发生“锁相”现象。

Phase Properties of Two-Mode SU(2) Coherent States of Light Field

In this paper, the phase properties of an anti-correlated two-mode ield, namely SU(2) coherent state field, are studied by means of the phase formalism given by Pegg and Barnett. The expressions of the phase probability distributions and the variance are obtained, demonstrating that single-mode phase and the slim of the two single-mode phase are all randomly distributed, and that if the field is strong and the photon numbers in both modes are nearly equal, the phase difference can not change and phase locking can occur.