On-chip quantum optics and integrated optomechanics

Abstract

Recent developments in quantum computing and the growing interest in optomechanics and quantum opticsneed platforms that enable rapid prototyping and scalability. This can be fulfilled by on-chip integration, as we presenthere. The different nanofabrication steps are explained, and our automated measurement setup is discussed. We presentan opto-electromechanical device, the H-resonator, which enables optomechanical experiments such as electrostaticsprings and nonlinearities and thermomechanical squeezing. Moreover, it also functions as an optomechanical phaseshifter, an essential element for our integrated quantum optics efforts. Besides this, the equivalent of a beam splitter inphotonics-the directional coupler-is shown. Its coupling ratio can be reliably controlled, as we show with experimentaldata. Several directional couplers combined can realize the CNOT operation with almost ideal fidelity.