Determining the internal quantum efficiency of shallow-implanted nitrogen-vacancy defects in bulk diamond Radko, Ilya P. ; Boll, Mads ; Israelsen, Niels M. ; Raatz, Nicole ; Meijer, Jan ; Jelezko, Fedor ; Andersen, Ulrik L. ; Huck, Alexander Abstract Publication: Optics Express Pub Date: November 2016 DOI: 10.1364/OE.24.027715 Bibcode: 2016OExpr..2427715R