Author(s)

Pablo Carlos López Vázquez, Gustavo López Vázquez

Departamento de Física, Universidad de Guadalajara, Guadalajara, Mexico.

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.

Decoherence; Chain of Nuclear Spins; Controlled-Not

P. López Vázquez and G. López Vázquez, "Quasi non-Markovian Approach to the Study of Decoherence of a Controlled-Not Quantum Gate in a Chain of Few Nuclear Spins Quantum Computer," Journal of Modern Physics, Vol. 3 No. 9, 2012, pp. 902-917. doi: 10.4236/jmp.2012.39118.