Multi-Photon, Multi-Level Dynamics in a Superconducting Persistent-Current Qubit
Yu, Y. · Oliver, W. D. · Lee, J. C. · Berggren, K. K. · Levitov, L. S. · Orlando, T. P.
Original · EN
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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