Defect Centers in Diamond for Quantum Applications: Prospects & Problems
Defect centers in diamonds have been studied extensively in the last years . They represent single photon sources with stable operation even at room temperature. Additionally, their spin state provides a long decoherence time and can be controlled and read-out optically.
In this talk we focus on nitrogen vacancy (NV) centers in nanocrystalline diamond. First, we introduce basic properties of nanodiamonds and introduce a method to assemble fundamental nanophotonic devices . Then, we report on a novel material platform based on direct laser writing in polymers which allows for fabrication of arbitrary three-dimensional quantum photonic structures .
In a second part of the talk we discuss decoherence of the electronic states in NV centers, which is crucial for possible applications in quantum information processing . Finally, we show how a scanning probe can be functionalized with a nanodiamond to perform three-dimensional lifetime imaging with a single quantum emitter.
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 O. Benson, Nature 480, 193 (2011).
 A. W. Schell, et al., arXiv:1209.2036
 J. Wolters et al., Phys. Rev. Lett. 110, 027401 (2013); J. Wolters, et al., arXiv:1301.4544
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