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Bulletin of the American Physical Society

Coherent frequency transfer of optical nonlinearities by feedback control of a non-degenerate optical parametric oscillator

Edwin Ng, Tatsuhiro Onodera, Ryotatsu Yanagimoto, Hideo Mabuchi

Published Mar 4, 2019• 0 citations
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The purpose of this article is to present an efficient coherent feedback control technique for squeezing enhancement of degenerate parametric amplifiers (DPAs). The feedback controllers to be designed are in the form of linear quantum stochastic systems which can be described by quantum feedback networks theory recently developed. The problem of squeezing enhancement is formulated as a non-convex constrained nonlinear programming problem, whose solution yields the coherent feedback controllers to be designed. Compared with the previous study, the proposed approach reveals clear advantage when DPAs are lossy, as is always the case in practice. Based on the recently developed quantum network synthesis theory, we show how the designed coherent feedback controllers can be implemented by means of quantum optical devices.