Phys. Rev. A 70, 034102 (2004) [3 pages]Special relativity and reduced spin density matricesReceived 28 October 2003; published 22 September 2004 We derive the general formula for Lorentz-transformed spin density matrix. It is shown that an appropriate Lorentz transformation can produce totally unpolarized state out of pure one. Further properties, as depurification by an arbitrary Lorentz boost and its relation to the localization properties are also discussed. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.70.034102
DOI:
10.1103/PhysRevA.70.034102
PACS:
03.65.Pm, 03.65.Ud, 03.30.+p
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