Waveguide-coupledsingleNVin.PDF

Waveguide-coupled single NV in diamond enabled by femtosecond laser writing J. P. HADDEN ?,1, ? V. BHARADWAJ ?,2 B. SOTILLO,3 S. RAMPINI,3 R. OSELLAME,3 J. WITMER,1, 4 H. JAYAKUMAR,1, 5 T. T. FERNANDEZ,2, 3 A. CHIAPPINI,6 C. ARMELLINI,6 M. FERRARI,6 R. RAMPONI,2, 3 P. E. BARCLAY,1 and S. M. EATON2, 3 1Institute for Quantum Science and Technology, University of Calgary, Calgary 2Department of Physics, Politecnico di Milano, Piazza Leonardo da Vinci 32, Milano, Italy 3Istituto di Fotonica e Nanotecnologie-Consiglio Nazionale delle Ricerche (IFN-CNR), Piazza Leonardo da Vinci 32, Milano, Italy 4Ginzton Laboratory, Stanford University, Stanford, CA 94305, USA 5Department of Physics, City University of New York (CUNY)City College of New York, New York, NY 10031, USA 6Istituto di Fotonica e Nanotecnologie (IFN)-CNR, CSMFO and FBK-CMM, Trento, Italy (Dated: Compiled April 10, 2017) Diamonds nitrogen vacancy (NV) center is an optically active defect with long spin coherence times, showing potential for e?cient nanoscale magnetometry and entanglement schemes. Recently, both the formation of buried 3D optical waveguides and high quality single NVs in diamond were demonstrated using femtosecond laser-writing. However, until now, combining these technologies has been an outstanding challenge. In this work, we fabricate laser-written photonic circuits in dia- mond aligned within micron resolution to single laser-written NVs, enabling an integrated platform providing deterministically positioned waveguide-coupled NVs. This fabrication technology opens the way towards on