Coherence stabilization of a two-qubit gate by AC fields

Details Coherence stabilization of a two-qubit gate by AC fields Coherence stabilization of a two-qubit gate by AC fields

2004-09-30

arxiv.org/abs/cond-mat/0409774v1

Phys. Rev. Lett. 95, 140502 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.95.140502

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.

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