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物理学报 2004
The uncertainty relations and squeezing effects for mixed states
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Abstract:
Based upon the Heisenberger's uncertainty relations for mixed states, the minimum uncertainty and squeezing effects are studies. Although all minimum uncertainty states must be pure states, the nucertainty of one dynamical variable can be squeezed in some pure states or mixed states, even if they are not minimum uncertainty states for the pair of dynamical variables. In addition, we present the general uncertainty relation of statistics, which has the similar mathmatical structure of Heisenberg's indeterminacy principle, but has no relation with quantum interfernce.