Single Photon Generation from locally doped semiconductors

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We have fabricated locally doped semiconductors using atomic layer doping to realize the generation of unpolarized single photons with highly reproducible wavelengths, which is essential in the field of quantum information technology, such as quantum cryptography. We have obtained unpolarized single photons by selecting a proper face of the substrate to grow nitrogen atomic layer doped semiconductors. In addition, we have successfully observed biexcition emission from nitrogen atomic layer doped semiconductors, which leads to the generation of entangled photon pairs.