Abstract
This chapter introduces solid-state single-photon sources based on single colour centres in diamond. Following an introduction to the applications of single-photon sources, we discuss the basic principles of their operation. We summarize the key parameters for characterizing a single-photon source and comment on diamond as a host material for single emitters. The main part of the chapter contains an extensive discussion of the various colour centres in diamond that have been investigated as single-photon sources, followed by a look at future prospects. In the final part of the chapter, we summarize the implementations of quantum key distribution with diamond-based singlephoton sources and discuss the results.
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