Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2005-06-13
Int. J. Modern Phys. B 20, 1476-1495 (2006)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
26 pages in PDF, 6 figures, 1 table; Typos corrected
Scientific paper
10.1142/S0217979206034066
We present an approach that allows quantifying decoherence processes in an open quantum system subject to external time-dependent control. Interactions with the environment are 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 quantumcomputing gate function. The approximations are found to produce consistent results at short and intermediate times.
Privman Vladimir
Solenov Dmitry
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