Depurification by Lorentz boosts
arXiv:quant-ph/0310145 · doi:10.1016/j.physleta.2004.07.001
Abstract
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 as seen by a moving observer. The result for its length is expressed in terms of dispersion of some vector operator linear in momentum. The relation with the localization properties is discussed.
arXiv comment5 pages