Zhang Y, Menotti M, Tan K, Vaidya V D, Mahler D H, Helt L G, Zatti L, Liscidini M, Morrison B, Vernon Z
Xanadu, Toronto, ON, Canada.
Department of Physics, University of Pavia, Pavia, Italy.
Nat Commun. 2021 Apr 14;12(1):2233. doi: 10.1038/s41467-021-22540-2.
Delicate engineering of integrated nonlinear structures is required for developing scalable sources of non-classical light to be deployed in quantum information processing systems. In this work, we demonstrate a photonic molecule composed of two coupled microring resonators on an integrated nanophotonic chip, designed to generate strongly squeezed light uncontaminated by noise from unwanted parasitic nonlinear processes. By tuning the photonic molecule to selectively couple and thus hybridize only the modes involved in the unwanted processes, suppression of parasitic parametric fluorescence is accomplished. This strategy enables the use of microring resonators for the efficient generation of degenerate squeezed light: without it, simple single-resonator structures cannot avoid contamination from nonlinear noise without significantly compromising pump power efficiency. We use this device to generate 8(1) dB of broadband degenerate squeezed light on-chip, with 1.65(1) dB directly measured.
要开发可扩展的非经典光源以部署在量子信息处理系统中，需要对集成非线性结构进行精细工程设计。在这项工作中，我们展示了一种由集成纳米光子芯片上的两个耦合微环谐振器组成的光子分子，其设计目的是产生不受不需要的寄生非线性过程噪声污染的强压缩光。通过调整光子分子以选择性地耦合并因此仅使参与不需要过程的模式杂交，实现了对寄生参量荧光的抑制。这种策略使得能够使用微环谐振器高效产生简并压缩光：没有它，简单的单谐振器结构在不显著损害泵浦功率效率的情况下无法避免非线性噪声的污染。我们使用该器件在芯片上产生了8(1) dB的宽带简并压缩光，直接测量值为1.65(1) dB。
