Appendix A Density Operator and Density Matrix - CERN

254 A Density Operator and Density Matrix As the trace of a matrix is known to be independent of its representation, any complete set fj ig can, therefore, be used for calculating Tr(˝)in(A.6). The Hermitian conjugate of the density operator (A.4)is D X i p ij iih ij! D X i p ij iih ijD; (A.7) remembering that each of the probabilities p i in ... ................
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