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General Theory of Decoherence of Qubit Systems in the Born-Markov Approximation
R. Joynt,Nguyen Bich Ha,Nguyen Hung Son,Ho Cong Son,Nguyen Dang Vu,Nguyen Van Hieu 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.1
The general theory of the decoherence of a two-level system as a qubit and a four-level system as a two-qubit system based on the Born-Markov approximation is presented. The derived formulae in the case of the two- level system are applied to two examples of the qubit: a system of electron states in a double quantum dot as a charge qubit and that of Zeeman split electron states in a quantum dot as a spin qubit. A generalization to the study of the decoherence of n-qubit systems is discussed.