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Echternach, P.M. (author), Stone, K.J. (author), Bradford, C.M. (author), Day, P.K. (author), Wilson, D.W. (author), Megerian, K.G. (author), Llombart Juan, N. (author), Bueno, J. (author)We observed a sweep rate dependence of the quantum capacitance in a single Cooper-Pair box used as the readout of a Quantum Capacitance Detector. A model was developed that fits the data over five orders of magnitude in sweep rate and optical signal power and provides a natural calibration of the absorbed power. We are thereby able to measure...journal article 2013
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Swenson, L.J. (author), Day, P.K. (author), Eom, B.H. (author), Leduc, H.G. (author), Llombart, N. (author), McKenney, C.M. (author), Noroozian, O. (author), Zmuidzinas, J. (author)If driven sufficiently strongly, superconducting microresonators exhibit nonlinear behavior including response bifurcation. This behavior can arise from a variety of physical mechanisms including heating effects, grain boundaries or weak links, vortex penetration, or through the intrinsic nonlinearity of the kinetic inductance. Although...journal article 2013