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Quasi non-Markovian Approach to the Study of Decoherence of a Controlled-Not Quantum Gate in a Chain of Few Nuclear Spins Quantum Computer
Departamento de Física, Universidad de Guadalajara, Guadalajara, Mexico
Departamento de Física, Universidad de Guadalajara, Guadalajara, Mexico
- 1 Departamento de Física, Universidad de Guadalajara, Guadalajara, Mexico
- 2 Departamento de Física, Universidad de Guadalajara, Guadalajara, Mexico
Journal of Modern Physics·Volume 03 (2012)·Pages 902–917·Published 24 September 2012·DOI10.4236/jmp.2012.39118
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Abstract
We develop in the weak coupling approximation a quasi-non-Markovian master equation and study the phenomenon of decoherence during the operation of a controlled-not (CNOT) quantum gate in a quantum computer model formed by a linear chain of three nuclear spins system with second neighbor Ising interaction between them. We compare with the behavior of the Markovian counterpart for temperature different from zero (thermalization) and at zero temperature for low and high dissipation rates. At low dissipation there is a very small difference between Markovian and quasi no-Markovian at any temperature which is unlikely to be measured, and at high dissipation there is a difference which is likely to be measured at any temperature.
KeywordsDecoherenceChain of Nuclear SpinsControlled-Not
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