奇偶相干态的Wehrl熵和Shannon熵

研究了奇、偶相干态的Ｗｅｈｒｌ熵和Ｓｈａｎｎｏｎ熵，结果表明，其Ｗｅｈｒｌ熵随总噪声的增加而增大，并趋向同一个常数。Ｓｈａｎｎｏｎ熵随力学量起伏的减小而减小，且这两种态的Ｓｈａｎｎｏｎ熵均可小于相干态的Ｓｈａｎｎｏｎ熵，但这时并不与压缩效应的出现相对应，因而Ｓｈａｎｎｏｎ熵不能成为压缩存在的判据。

The Wehrl′s Entropy and Shannon′s Entropy for Even and Odd Coherent States

The Wehrl's entropties and Shannon's entropies for even and odd coherent states are studied. The results show that the Wehrl's entropics of the two states are increased along with growth of the total noise and tend to a common constant. The Shannon's entropies are decreased along with decrease of observable fluctuation. Both Shannon's entropies of the two states can be less than that of coherent state, but which is not corresponding to the appearance of squeezing effect. So, the amount of Shannon's entropy can not be a criteron of existance of squeezing.