We report the creation of a low-loss, broadband optical antenna giving highly directed output from a coherent single spin in the solid-state. The device, the first solid-state realization of a dielectric antenna, is engineered for individual nitrogen vacancy (NV) electronic spins in diamond. We demonstrate a directionality close to 10. The photonic structure preserves the high spin coherence of single crystal diamond (T2>100us). The single photon count rate approaches a MHz facilitating efficient spin readout. We thus demonstrate a key enabling technology for quantum applications such as high-sensitivity magnetometry and long-distance spin entanglement.
@article{arxiv.1408.4117,
title = {A low-loss, broadband antenna for efficient photon collection from a coherent spin in diamond},
author = {D. Riedel and D. Rohner and M. Ganzhorn and T. Kaldewey and P. Appel and E. Neu and R. J. Warburton and P. Maletinsky},
journal= {arXiv preprint arXiv:1408.4117},
year = {2015}
}
Comments
5 pages, 4 figures and supplementary information (5 pages, 8 figures). Comments welcome. Further information under http://www.quantum-sensing.physik.unibas.ch