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Abstract: We report on radio-frequency measurements of the charge-phase qubit beingunder continuous microwave irradiation in the state of weak coupling to aradio-frequency tank circuit. We studied the rf impedance dependence on the twoimportant parameters such as power of microwave irradiation whose frequency isclose to the gap between the two lowest qubit energy levels, and temperature ofthe internal heat bath. We have found that backaction effects of the qubit onthe rf tank, and vice versa, tank on the qubit, lead to a negative as well as apositive real part of the qubit impedance Re$Z\omega$ seen by the tank. Wehave implemented noise spectroscopy measurements for direct impedance readoutat the extreme points corresponding to maximum voltage response and obtainedabsolute values of about 0.017 $\Omega$ for the negative and positiveRe$Z\omega$. Our results demonstrate the existence and persistence of thecoherent single- and multi-photon Rabi dynamics of the qubit with both negativeand positive dynamic resistance inserted into the tank in the temperature rangeof 10 to 200 mK.



Autor: V.I. Shnyrkov, D. Born, A.A. Soroka, W. Krech

Fuente: https://arxiv.org/



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