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Multi-Photon, Multi-Level Dynamics in a Superconducting Persistent-Current Qubit

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arxiv cond-mat/0508587 v1 pith:3LLNGRY6 submitted 2005-08-24 cond-mat.supr-con

Multi-Photon, Multi-Level Dynamics in a Superconducting Persistent-Current Qubit

Y. Yu , W. D. Oliver , J. C. Lee , K. K. Berggren , L. S. Levitov , T. P. Orlando This is my paper
classification cond-mat.supr-con
keywords stateswerequbitapproximatelyexcitedfourthmulti-levelmulti-photon
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Single-, two-, and three-photon transitions were driven amongst five quantum states of a niobium persistent-current qubit. A multi-level energy-band diagram was extracted using microwave spectroscopy, and avoided crossings were directly measured between the third and fourth excited states. The energy relaxation times between states connected by single-photon and multi-photon transitions were approximately 30 - 100 microseconds. Three-photon coherent oscillations were observed between the qubit ground and fourth excited states with a decoherence time of approximately 50 nanoseconds.

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