Development of quantum discrete frequency combs techniques

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We have successfully completed the main task of our original plan in Fiscal Year (FY) 2015 and 2016. In FY2015, we constructed a fiber spectrometer to measure the spectrally resolved Hong-Ou-Mandel interference between independent photon sources (HOMI-IPS). This experiment not only can deepen our understanding of HOMI-IPS in frequency domain, but also provides an important tool to test the theoretical predictions of HOMI-IPS using spectrally engineered photon sources. This result was published in Optics Express in 2015. In FY2016, we successfully generated discrete frequency modes in a Hong-Ou-Mandel interference. These modes are equally distributed in the frequency domain, and thus have a kind of frequency comb structure, forming a type of high dimensional entangled state (qudit). This result (arXiv:1603.07887) has been submitted to some high-profile journal.All of these experiments were done at 1.5 micrometer telecom wavelength, which is most suitable for long-haul optical communications. Therefore, our technology would enable us to enhance performances in optical-fiber-based quantum communication, e.g. quantum cryptography. Moreover, the distribution of distinct entangled frequency modes may also be useful for improving quantum metrology, quantum remote synchronization, as well as fundamental tests of stronger violation of local realism at the telecom wavelength.