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Dynamical Autler-Townes control of a phase qubit



Jian Li, G.S. Paraoanu, Katarina Cicak, Fabio Altomare, Jae Park, Raymond Simmonds, Mika A. Sillanpaa, Pertti Hakonen


We present an experimental demonstration of a phase qubit acting as an on/o® switch for the absorbtion of photons in a probe microwave beam. The switch is controlled by a second control microwave ¯eld. The on/o® states of the qubit are steady states which for suitable values of the control ¯eld can be close enough to dark states. The functioning of the device is based on the Autler-Townes e®ect. A full numerical model up to the ¯fth energy level, including independently- determined parameters for relaxation, dephasing, and cross-couplings, gives excellent agreement with the experiment and allows us to characterize the time-scale for switching.
Applied Physics Letters


superconducting, qubits


Li, J. , Paraoanu, G. , Cicak, K. , Altomare, F. , Park, J. , Simmonds, R. , Sillanpaa, M. and Hakonen, P. (2012), Dynamical Autler-Townes control of a phase qubit, Applied Physics Letters, [online],, (Accessed May 24, 2024)


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Created September 9, 2012, Updated October 12, 2021