Demonstration of integrated microscale optics in surface-electrode ion   traps
  In ion trap quantum information processing, efficient fluorescence collection is critical for fast, high-fidelity qubit detection and ion-photon entanglement. The expected size of future many-ion processors require scalable light collection systems. We report on the development and testing of a microfabricated surface-electrode ion trap with an integrated high numerical aperture (NA) micromirror for fluorescence collection. When coupled to a low NA lens, the optical system is inherently scalable to large arrays of mirrors in a single device. We demonstrate stable trapping and transport of 40Ca+ ions over a 0.63 NA micromirror and observe a factor of 1.9 enhancement in photon collection compared to the planar region of the trap. 
J. True Merrill, Curtis Volin, David Landgren, Jason M. Amini, Kenneth   Wright, S. Charles Doret, C.-S. Pai, Harley Hayden,...
quant-ph