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APS

Phonon-induced decoherence in donor-based charge qubits

Fredy Lastra, Sebastián A. Reyes, Sascha Wallentowitz

Published Mar 1, 2010• 0 citations
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Phonon-induced entanglement dynamics of two donor-based charge quantum bits

F. Lastra, Sebastián A. Reyes, Sascha Wallentowitz

The entanglement dynamics of a pair of donor-based charge qubits is obtained in analytical form. The disentanglement is induced by off resonant scattering of acoustical phonons in the semiconductor host. According to our results a rather unusual recovery of entanglement occurs that depends on the geometrical configuration of the qubits. In addition, for large times a non-vanishing stationary entanglement is predicted. For the cases of one and two initial excitations a simple kinetic interpretation allows for an adequate analysis of the observed dynamics. Our results also reveal a direct relation between the disentanglement rate and the inter-donor decoherence rates.

arXiv:1108.2416•Journal of Physics B Atomic Molecular and Optical Physics•Dec 15, 2011•1 citation
The entanglement dynamics of a pair of donor-based charge qubits is obtained in analytical form. The disentanglement is induced by off resonant scattering of acoustical phonons in the semiconductor host. According to our results a rather unusual recovery of entanglement occurs that depends on the geometrical configuration of the qubits. In addition, for large times a non-vanishing stationary entanglement is predicted. For the cases of one and two initial excitations a simple kinetic interpretation allows for an adequate analysis of the observed dynamics. Our results also reveal a direct relation between the disentanglement rate and the inter-donor decoherence rates.