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Modular linear optical circuits
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DOI：10.1364/OPTICA.5.001087.png)
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Abstract
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Linear optical circuits that can provide reconfigurable interference between several optical modes are emerging as a powerful tool for both classical and quantum optics. In this work, we propose and demonstrate a modular architecture for building these circuits. Each module contains independent phase-controlled Mach-Zehnder interferometers, and several modules can be interfaced to build large reconfigurable interferometers. We demonstrate our approach by fabricating three modules in the form of ultraviolet-written silica-on-silicon chips. We characterize these chips, connect them to each other, and implement a wide range of linear optical transformations. Our work facilitates the development of large-scale linear optical circuits for quantum optics. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License.
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