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Phys. Rev. A 72, 012103 (2005) [7 pages]

Lorentz-covariant reduced spin density matrix and Einstein-Podolsky-Rosen–Bohm correlations

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Paweł Caban * and Jakub Rembieliński †
Department of Theoretical Physics, University of Lodz, Pomorska 149/153, 90-236 Łódź, Poland

Received 10 November 2004; published 5 July 2005

We show that it is possible to define a Lorentz-covariant reduced spin density matrix for massive particles. Such a matrix allows one to calculate the mean values of observables connected with spin measurements (average polarizations). Moreover, it contains not only information about polarization of the particle but also information about its average kinematical state. We also use our formalism to calculate the correlation function in the Einstein-Podolsky-Rosen–Bohm type experiment with massive relativistic particles.


©2005 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevA.72.012103
DOI: 10.1103/PhysRevA.72.012103
PACS: 03.65.Ta, 03.65.Ud

* Electronic address: p.caban@merlin.fic.uni.lodz.pl
† Electronic address: j.rembielinski@merlin.fic.uni.lodz.pl

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