Abstract

Multi-mode interferometers can be used for a wide range of applications. They allow a higher precision for a phase measurement compared to a simple two-mode version [1,2]. In quantum optics, schemes for enhancement of non-classical visibility [3] as well as better resilience to photon loss [4] have been proposed. All these schemes depend on a good stability of the used interferometer, which gives integrated optics, such as laser-written waveguides [5], a natural advantage over bulk-optics. Furthermore, waveguide interferometers always ensure perfect mode overlap at the recombiner, yielding higher interference contrast. For some experiments investigating fundamentals of quantum mechanics there is also a need for an individual manipulation and switching of each path [6-10].

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