Physical interpretation of the Wigner rotations and its implications for relativistic quantum information

Details Physical interpretation of the Wigner rotations and its implications for relativistic quantum information Physical interpretation of the Wigner rotations and its implications for relativistic quantum information

2011-11-30

arxiv.org/abs/1111.7145v2

New J. Phys. 14, 023041 (2012)

Physics

Quantum Physics

10 pages, 2 figures. Several changes were made on the text. One extra example was included

Scientific paper

10.1088/1367-2630/14/2/023041

We present a new treatment for the spin of a massive relativistic particle in the context of quantum information based on a physical interpretation of the Wigner rotations, obtaining different results in relation to the previous works. We are lead to the conclusions that it is not possible to define a reduced density matrix for the particle spin and that the Pauli-Lubanski (or similar) spin operators are not suitable to describe measurements where spin couples to an electromagnetic field in the measuring apparatus. These conclusions contradict the assumptions made by most of the previous papers on the subject. We also propose an experimental test of our formulation.

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