Classical and quantum-mechanical state reconstruction
Por:
Khanna F.C., Mello P.A., Revzen M.
Publicada:
1 jul 2012
Categoría:
Physics and Astronomy (miscellaneous)
Resumen:
The aim of this paper is to present the subject of state reconstruction in classical and in quantum physics, a subject that deals with the experimentally acquired information that allows the determination of the physical state of a system. Our first purpose is to explain a method for retrieving a classical state in phase space, similar to that used in medical imaging known as computer-aided tomography. It is remarkable that this method can be taken over to quantum mechanics, where it leads to a description of the quantum state in terms of the Wigner function which, although it may take on negative values, plays the role of the probability density in phase space in classical physics. We then present another approach to quantum state reconstruction based on the notion of mutually unbiased bases-a notion of current research interest, for which we give explanatory remarks-and indicate the relation between these two approaches. Since the subject of state reconstruction is rarely considered
Filiaciones:
Khanna F.C.:
Theoretical Physics Institute, Physics Department, University of Alberta, Edmonton, AB T6G 2J1, Canada
Mello P.A.:
Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 01000, DF, Mexico
Revzen M.:
Department of Physics, Technion - Israel Institute of Technology, Haifa 32000, Israel
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