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quant-ph2003
Depurification by Lorentz boosts
P. Kosinski, P. Maslanka
We consider a particle of half-integer spin which is nonrelativistic in the rest frame. Assuming the particle is completely polarized along third axis we calculate the Bloch vector…
quant-ph2003
Special relativity and reduced spin density matrices
Cezary Gonera, Piotr Kosinski, Pawel Maslanka
We derive the general formula for Lorentz-transformed spin density matrix. It is shown that an appropriate Lorentz transformation can prduce totally unpolarized state out of pure o…