科研之友
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摘要
The dynamical evolution of open systems can be conveniently expressed in the operator sum representation in terms of Kraus operators. Here we introduce an expression for the canonical Kraus representation in terms of the eigenstates |?> and eigenvalues E? of the total Hamiltonian, thus making a stronger connection to the tools in chemistry. The method is exact, and hence valid for non-Markovian evolution of the system to all orders of the coupling to the bath. Significantly, it provides a starting point for developing approximate Kraus operators based upon perturbative approximations to |?> and E?. As an example, the explicit form of these operators is derived for a d-level system interacting with a single-mode thermal bath.
- 出版日期2012-5
