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Coherence, detectability and correlation in a quantum measurement process are studied by means of the generalized Coleman–Hepp model, in which a spin of a propagating particle is measured and a detector system consists of a one-dimensional array of independent spin-1/2 particles. It is found that the coherence of the measured particle decreases in time, while the detectability of the particle spin...
Correlations between single qubit and classical environment are studied by means of the stochastic Liouville equation, where a dephasing coupling between them is assumed. When the dephasing of the qubit is characterized by the two-state-jump Markov process, the properties of the total, classical and quantum correlations are examined.
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