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Exact Solutions for Decoherence Problems
Quantum decoherence problems are usually solved by perturbation
theory or numerical computation. There are few examples of interesting
exactly solvable models. D. Nghiem, B. Cheng, Q-H. Wang and I have
discovered some of these models and have been exploring their properties.
We first noticed that models with random noise at predictable intervals
were solvable, and have recently extended this to the more interesting case
of telegraph noise.
D. Nghiem and R. Joynt, Phys. Rev. A 73, 032333 (2006), (also selected for
the April 3, 2006 issue of Virtual Journal of Nanoscale Science &
Technology
and the April, 2006 issue of Virtual Journal and Quantum Information
Science).
Qiang-hua Wang, Bin Cheng, and Robert Joynt, quant-phys/0707.3857,
submitted to Phys. Rev. A
Exact solution of qubit decoherence models by a
transfer matrix method
Exact solution of a model of qubit decoherence due to
telegraph noise
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