Description:

NIST researchers have designed and operated a circuit based on a large-area current-biased Josephson junction whose two lower energy quantum levels could be used to implement a solid-state qubit. The circuit allows measurement of the qubit states with a fidelity of 85% while providing sufficient decoupling from external sources of relaxation and decoherence to allow coherent manipulation of the qubit state, as demonstrated by the observation of Rabi oscillations. With the present design a maximum quality factor of 1000 is measured from the width of spectral lines. Work is presently underway to fabricate devices with alternative materials and processes to improve the coherence time of the qubit.  This qubit circuit is the basis of a scalable quantum computer.
 

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