Decoherence and beyond

Eleonora Alfinito, Rosario Gaetano Viglione, Giuseppe Vitiello

The decoherence mechanism signals the limits beyond which the system dynamics approaches the classical behavior. We show that in some cases decoherence may also signal the limits beyond which the system dynamics has to be described by quantum field theory, rather than by quantum mechanics.

Philip C. E. Stamp

Ding Jia

Tiefu Li, You Jianqiang, Liu Jian-She +1 more

In this paper the master equation method is used to calculate the relaxation and decoherence times of a qubit. The results are beyond Markovian approximation, where the noise spectrum is assumed to be wide-band, so that they are valid for not only the wide- but also the narrow-band noises, which may be the main decoherence source in solid-state qubits. Moreover, for some special cases, analytical results can be achieved, which are consistent with those derived by others.

Wenxiang Hu, Ignacio Franco

We numerically study electronic decoherence introduced by electron-nuclear couplings in molecules through an exact quantum method. This strategy offers detailed insights into decoherence mechanisms that go beyond those offered by master equations or approximate schemes.