Relativistic effects in spin density matrices and quantum measurements
ABSTRACT
Spin density matrices and quantum measurements form the central most important part in quantum physics, quantum information and quantum computation theories. In the non-relativistic limits, they are highly effective in theory and practice. However, when we try to incorporate the special relativistic effects in the calculation of reduced spin density matrices or the quantum measurements, we usually run into some conceptual as well as calculations difficulties. In this regard, in this talk, I will discuss and review some paradoxical results on the topics of the special relativistic effects in the theory of reduced spin density matrices and quantum measurement formalism. I will also present current approach to these problems and the state of the art to understand the relativistic effects in this area. At the end I will also touch up on how general relativity may come into the picture.
