Coherence stabilization of a two-qubit gate by AC fields

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We consider a CNOT gate operation under the influence of quantum bit-flip noise and demonstrate that ac fields can change bit-flip noise into phase noise and thereby improve coherence up to several orders of magnitude while the gate operation time remains unchanged. Within a high-frequency approximation, both purity and fidelity of the gate operation are studied analytically. The numerical treatment with a Bloch-Redfield master equation confirms the analytical results.
4 pages, 2 figures

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Mesoscale and Nanoscale Physics, Statistical Mechanics

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http://salesiana.dossiersoluciones.com/handle/123456789/95137

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0409774
 http://arxiv.org/abs/cond-mat/0409774
 Phys. Rev. Lett. 95, 140502 (2005)
 doi:10.1103/PhysRevLett.95.140502

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arXiv