The problem of closing the detection loophole with asymmetric systems, such as entangled atom-photon pairs, is addressed. We show that, for the Bell inequality ${I}_{3322}$, a minimal detection efficiency of 43% can be tolerated for one of the particles, if the other one is always detected. We also study the influence of noise and discuss the prospects of experimental implementation.
Bradley Christensen, Kevin T. McCusker, Joseph B. Altepeter, Brice Calkins, Thomas Gerrits, Adriana E. Lita, Aaron Miller, Lynden K. Shalm, Yu Zhang, Sae Woo Nam, Nicolas Brunner, Charles Ci Wen Lim, Nicolas Gisin, Paul G. Kwiat
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