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Q: Fachverband Quantenoptik und Photonik
Q 41: Nano-Optics I
Q 41.1: Gruppenbericht
Mittwoch, 25. März 2015, 14:30–15:00, B/gHS
Quantum sensing using single nitrogen vacancy color centers in diamond — •Elke Neu, Patrick Appel, Arne Barfuß, Marc Ganzhorn, Jean Teissier, Lucas Thiel, Daniel Riedel, Dominik Rohner, and Patrick Maletinsky — University of Basel, Department of Physics, 4056 Basel, Switzerland
Single nitrogen vacancy (NV) color centers in diamond represent stable quantum emitters. They simultaneously offer coherent, optically addressable electronic spin-states and are highly suitable as nanoscopic sensors for e.g magnetic fields and optical near fields. Efficient fluorescence extraction is vital for applying NV centers as single photon sources and sensors, however, it is intrinsically challenging due to the high refractive index of diamond. We present novel photonic devices namely diamond nanopillars with optimally aligned NV centers [1] as well as a low-loss, broadband optical antenna [2] for efficient photon collection. For both approaches, we reach photon count rates in the order of one MHz. Importantly, the dielectric antenna in principle allows for near-unity collection efficiency and fully preserves the NV spin coherence time of T2 > 100 µs. Our unique diamond nanostructures enable various applications such as high-performance quantum sensing or the study of hybrid quantum systems. We will present examples in nanoscale NV magnetometry and near field optical imaging, as well as coupling of NV spins to diamond nanomechanical oscillators [3].
E. Neu et al., Appl. Phys. Lett., 104, 153108 (2014)
D. Riedel et al., accepted at Phys. Rev. Appl. (2014)
J. Teissier et al., Phys. Rev. Lett., 113, 020503 (2014)