Instituto de Ciencia de Materiales de Madrid
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Coherence stabilization of a two-qubit gate by ac fields

Karen M. Fonseca-Romero, Sigmund Kohler, and Peter Hänggi
Phys. Rev. Lett. 95, 140502 (2005)

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.
arXiv:cond-mat/0409774

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last modified: 23.11.2017 by Sigmund Kohler