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- Title
EVALUATION OF DECOHERENCE FOR QUANTUM COMPUTING ARCHITECTURES:: QUBIT SYSTEM SUBJECT TO TIME-DEPENDENT CONTROL.
- Authors
Solenov, Dmitry; Privman, Vladimir
- Abstract
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 quantum-computing gate function. The approximations are found to produce consistent results at short and intermediate times.
- Subjects
QUANTUM theory; PHYSICS; MAGNETIC coupling; MATRICES (Mathematics); COHERENCE (Optics)
- Publication
International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics, 2006, Vol 20, Issue 11-13, p1476
- ISSN
0217-9792
- Publication type
Article
- DOI
10.1142/S0217979206034066