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Bulletin of the American Physical Society

Electromagnetically induced transparency and coherent population trapping with a superconducting artificial atom

С. А. Новиков, Timothy M. Sweeney, J. E. Robinson, Baladitya Suri, F. C. Wellstood, B. S. Palmer

Published Mar 4, 2015• 0 citations
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The phenomenon of coherent population trapping (CPT) of an atom (or solid state "artificial atom"), and the associated effect of electromagnetically induced transparency (EIT), are clear demonstrations of quantum interference due to coherence in multilevel quantum systems. We report observation of CPT in a superconducting phase qubit by simultaneously driving two coherent transitions in a Lambda-type configuration, utilizing the three lowest lying levels of a local minimum of a phase qubit. We observe 60(+/-7)% suppression of the excited state population under conditions of CPT resonance. We present data and matching theoretical simulations showing the development of CPT in time. Finally, we used the observed time dependence of the excited state population to characterize quantum dephasing times of the system.