Multi-Photon, Multi-Level Dynamics in a Superconducting Persistent-Current Qubit
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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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Asymmetry Control in a Parametric Oscillator for the Quantum Simulation of Chemical Activation
A continuously driven Kerr parametric oscillator with third-order nonlinearity is operated as a tunable asymmetric double-well quantum simulator to study dissipative tunneling rates relevant to chemical activation.
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