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Bulletin of the American Physical Society

Superconducting Single Electron Transistor Coupled to a DC-Biased High-Q Microwave Cavity

Fei Chen, Weiwei Xue, Ian Hayes, M. P. Blencowe, A. J. Rimberg

Published Mar 17, 2010• 0 citations
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We report controllable coupling between coherent excitations in a silicon transistor, which is useful for double-qubit gate operation. Coupling interactions may be directed by adjusting the gate voltage in a semiconductor device or by an additional flux in a superconducting device. Here, we demonstrate an alternative approach to coupling by exploiting the nonlinear behavior of the silicon transistor. Microwave spectroscopy on a DC-biased transistor has previously been found to indicate the presence of coherent oscillating electrons. We couple two such resonances by using triple-frequency spectroscopy, where the third frequency corresponds to the frequency difference between the two on-resonance frequencies.
This chapter investigates the quantum versus classical dynamics of a microwave cavity-coupled-Cooper-pair transistor (CPT) system, where a variable applied dc bias causes the system to tunably self-oscillate via the ac Josephson effect. An essential feature of the system is that the dc bias does not significantly affect the high quality factor of the cavity mode to which the CPT predominantly couples. The classical, nonlinear dynamics of the system exhibits chaotic, as well as aperiodic motions depending on the initial conditions and the nature and strengths of the damping/noise forces. The corresponding quantum dynamics exhibits such phenomena as dynamical tunnelling and the generation of nonclassical states from initial classical states. Obviating the need for an external ac-drive line, which typically is harder to noise filter than a dc bias line, the self-oscillating system described here has considerable promise for demonstrating macroscopic quantum dynamical behaviour.