- #1
whatisreality
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I've been reading these notes: http://www.vcpc.univie.ac.at/~ian/hotlist/qc/talks/bloch-sphere-rotations.pdf
And on slide 11, to check what the rotation operator is doing, the state is pre- and post-multiplied by the operator so that the calculation performed is
##\rho' = R\rho R^{\dagger}##
Why do we need to do that and not just
##\rho' = R\rho##?
Thanks for any help! :)
And on slide 11, to check what the rotation operator is doing, the state is pre- and post-multiplied by the operator so that the calculation performed is
##\rho' = R\rho R^{\dagger}##
Why do we need to do that and not just
##\rho' = R\rho##?
Thanks for any help! :)