Saturday, February 14, 2015

quantum mechanics - Coherences in the density matrix


It is said that the off-diagonal elements of density matrix are "coherence". When a system interacts with its environment the off-diagonal elements decay and the final density matrix is the diagonal one, a statistical mixture. This process is called decoherence.


We know that every density matrix can be diagonalized in some basis.


What would decoherence be when the density matrix is diagonal in some basis?




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