Abstract

Within the framework of the tomographic-probability representation of quantum mechanics, we revisit the problem of the qubit evolution and show that the dynamics can be efficiently separated into two processes, namely, the unitary-like rotation and the relaxation. We study both types of evolution and derive analogs of the master equation for tomographic probabilities. We derive the tomographic relaxation equation for the qubit spin tomogram and investigate the properties of its solution for both anisotropic and isotropic cases of the relaxation. We analyze the relation between the spin tomographic description and the symmetric informationally complete description of the qubit time evolution.

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