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The squeezing properties of the atomic collective phase quadrature operator with respect to a two-level atomic coherent state are discussed in detail. We show that only the X component is squeezed when α is a real number, but, when α is a pure imaginary number, only Y component squeezing occurs.
We give a simple explanation for the fractional quantum Hall effect at even and odd denominator filling factors from the viewpoint of the topological property of a two-dimensional electron gas, and predict that for the next most dominant series of the fractional quantum Hall effect of the filling factorν = p p ± 1) , p = p ± qq + 1),p , q being integers, the corresponding incompressible quantum...
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