2011/06/29 by M. P. Blencowe, Blencowe, Miles, A. D. Armour +3
Physics and Astronomy · #Mechanical and Optical Resonators #Nonlinear Photonic Systems #Semiconductor Quantum Structures and Devices
paper · pdf · doi:10.48550/arxiv.1106.5945
We investigate the quantum versus classical dynamics of a microwave\ncavity-coupled-Cooper pair transistor (CPT) system, where an applied dc bias\ncauses the system to self-oscillate via the ac Josephson effect. Varying the dc\nbias allows the self-oscillation frequency to be tuned. An unusual feature of\nthe system design is that the dc bias does not significantly affect the high\nquality factor of the cavity mode to which the CPT predominantly couples. The\nCPT-cavity mode system has a mechanical analogue involving a driven coupled\npendulum-oscillator system. The corresponding, nonlinear classical dynamical\nequations exhibit chaotic, as well as aperiodic motions depending on the\ninitial conditions and the nature and strengths of the damping/noise forces.\nThe quantum master equation exhibits such phenomena as dynamical tunneling and\nthe generation of non-classical states from initial classical states. Obviating\nthe need for an external ac-drive line, which typically is harder to noise\nfilter than a dc bias line, the self-oscillating system described here has\nconsiderable promise for demonstrating macroscopic quantum dynamical behavior.\n