Analysis of Photodiode Sensing Devices in a Photonic Integrated Chip solution for Quantum Computing

From encryption to machine learning, the interest in quantum technologies is growing by the day. Many big companies are pushing the research and trying to develop a variety of techniques to achieve the so-called "quantum supremacy." Among all, there is one which is simpler to build an integrated system with: photonics. In this study, we illustrate the characterization for sensing elements of a prototype photonic integrated chip (PIC) where the photonic layer and the detector layer are homogeneously integrated. We fabricated in our facility a testing chip with silicon photodiodes as output devices. After the characterization discussed in this work, such detectors will be used as fully integrated sensing elements for a more advanced chip featuring thermistors as phase shifters in a multiple Mach-Zehnder Interferometers architecture.