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

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

2005-08-24

arxiv.org/abs/cond-mat/0508587v1

Physics

Condensed Matter

Superconductivity

11 pages, 4 figures

Scientific paper

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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