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seen Jan 13 '13 at 13:42

Jan
12
awarded  Student
Jan
12
comment Is it possible to write a Density Matrix in the following form?
I don't think so, because here $\left\{|x_{\ell}>\right\}_{\ell = 1}^{N}$ don't form a basis for space they are just an ensemble.
Jan
12
comment Is it possible to write a Density Matrix in the following form?
yeah, that's right but the coefficients of $|x_{\ell}>$ here are all the same and we have factorized them out as $\frac{1}{N}$, besides $|x_{\ell}>$ are normal states! how can it be possible ?
Jan
12
asked Is it possible to write a Density Matrix in the following form?