Chip-based squeezing at a telecom wavelength

Abstract

We demonstrate a squeezing experiment exploiting the association of\nintegrated optics and telecom technology as key features for compact, stable,\nand practical continuous variable quantum optics. In our setup, squeezed light\nis generated by single pass spontaneous parametric down conversion on a lithium\nniobate photonic circuit and detected by an homodyne detector whose\ninterferometric part is directly integrated on the same platform. The remaining\nparts of the experiment are implemented using commercial plug-and-play devices\nbased on guided-wave technologies. We measure, for a CW pump power of 40\\,mW, a\nsqueezing level of $-2.00\\pm0.05$\\,dB, (antisqueezing $+2.80\\pm0.05$\\,dB) thus\nconfirming the validity of our approach and opening the way toward miniaturized\nand easy-to-handle continuous variable based quantum systems.\n