Scalable ion–photon quantum interface based on integrated diffractive mirrors
Moji Ghadimi, Valdis Blūms, Benjamin G. Norton, Paul M. Fisher, Steven C. Connell, Jason M. Amini, Curtis Volin, Harley Hayden, Chien-Shing Pai, David Kielpinski, Mirko Lobino, Erik W. Streed · npj Quantum Information · 2017
Abstract Quantum networking links quantum processors through remote entanglement for distributed quantum information processing and secure long-range communication. Trapped ions are a leading quantum information processing platform, having demonstrated universal small-scale processors and roadmaps for large-scale implementation. Overall rates of ion–photon entanglement generation, essential for remote trapped ion entanglement, are limited by coupling efficiency into single mode fibers and scaling to many ions. Here, we show a microfabricated trap with integrated diffractive mirrors that couples 4.1(6)% of the fluorescence from a174Yb+ion into a single mode fiber, nearly triple the demonstrated bulk optics efficiency. The integrated optic collects 5.8(8)% of theπtransition fluorescence, images the ion with sub-wavelength resolution, and couples 71(5)% of the collected light into the fiber. Our technology is suitable for entangling multiple ions in parallel and overcomes mode quality limitations of existing integrated optical interconnects.