期刊
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
卷 20, 期 11-13, 页码 1476-1495出版社
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0217979206034066
关键词
decoherence; qubit; quantum
We present an approach that allows quantifying decoherence processes in an open quantum system subject to external time-dependent control. Interactions with the environment axe modeled by a standard bosonic heat bath. We develop two unitarity-preserving approximation schemes to calculate the reduced density matrix. One of the approximations relies on a short-time factorization of the evolution operator, while the other utilizes expansion in terms of the system-bath coupling strength. Applications are reported for two illustrative systems: an exactly solvable adiabatic model, and a model of a rotating-wave quantum-computing gate function. The approximations axe found to produce consistent results at short and intermediate times.
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