Superconducting Microwave Multivibrator Produced by Coherent Feedback
Joseph Kerckhoff, K. W. Lehnert
DOI 10.1103/PhysRevLett.109.153602 · Physical Review Letters
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Abstract
We investigate a nonlinear coherent feedback circuit constructed from preexisting superconducting microwave devices. The network exhibits emergent bistable and astable states, and we demonstrate its operation as a latch and the frequency locking of its oscillations. While the network is tedious to model by hand, our observations agree quite well with the semiclassical dynamical model produced by a new software package (N. Tezak et al., arXiv:1111.3081v1 [Phil. Trans. R. Soc. A (to be published)]) that systematically interpreted an idealized schematic of the system as a quantum optic feedback network.