Steidle Jeffrey A, Fanto Michael L, Preble Stefan F, Tison Christopher C, Howland Gregory A, Wang Zihao, Alsing Paul M
Microsystems Engineering, Rochester Institute of Technology;
Microsystems Engineering, Rochester Institute of Technology; Air Force Research Laboratory, Rome, NY.
J Vis Exp. 2017 Apr 4(122):55257. doi: 10.3791/55257.
Silicon photonic chips have the potential to realize complex integrated quantum information processing circuits, including photon sources, qubit manipulation, and integrated single-photon detectors. Here, we present the key aspects of preparing and testing a silicon photonic quantum chip with an integrated photon source and two-photon interferometer. The most important aspect of an integrated quantum circuit is minimizing loss so that all of the generated photons are detected with the highest possible fidelity. Here, we describe how to perform low-loss edge coupling by using an ultra-high numerical aperture fiber to closely match the mode of the silicon waveguides. By using an optimized fusion splicing recipe, the UHNA fiber is seamlessly interfaced with a standard single-mode fiber. This low-loss coupling allows the measurement of high-fidelity photon production in an integrated silicon ring resonator and the subsequent two-photon interference of the produced photons in a closely integrated Mach-Zehnder interferometer. This paper describes the essential procedures for the preparation and characterization of high-performance and scalable silicon quantum photonic circuits.
硅光子芯片有潜力实现复杂的集成量子信息处理电路，包括光子源、量子比特操纵和集成单光子探测器。在此，我们展示了制备和测试具有集成光子源和双光子干涉仪的硅光子量子芯片的关键方面。集成量子电路最重要的方面是将损耗降至最低，以便所有产生的光子都能以尽可能高的保真度被检测到。在此，我们描述了如何通过使用超高数值孔径光纤紧密匹配硅波导的模式来进行低损耗边缘耦合。通过使用优化的熔接工艺，超高数值孔径光纤与标准单模光纤无缝对接。这种低损耗耦合使得能够在集成硅环谐振器中测量高保真度的光子产生，并在紧密集成的马赫-曾德尔干涉仪中对产生的光子进行后续的双光子干涉。本文描述了高性能、可扩展硅量子光子电路的制备和表征的基本程序。
