Witthaut, DirkLukin, MikhailSørensen, Anders S.2012-11-262012Witthaut, Dirk, Mikhail D. Lukin, and Anders S. Sørensen. 2012. Photon sorters and QND detectors using single photon emitters. Europhysics Letters 97(5): 50007.0295-50751286-4854http://nrs.harvard.edu/urn-3:HUL.InstRepos:9938867We discuss a new method for realizing number-resolving and non-demolition photo detectors by strong coupling of light to individual single photon emitters, which act as strong optical non-linearities. As a specific application we show how these elements can be integrated into an error-proof Bell state analyzer, whose efficiency exceeds the best possible performance with linear optics even for a modest atom-field coupling. The methods are error-proof in the sense that every detection event unambiguously projects the photon state onto a Fock or Bell state and imperfections only result in reduced success probability, not in wrong results.en-USlinear opticsquantum-dotatomtransistorplasmonscircuitcavityJournal Article2012-11-2610.1209/0295-5075/97/50007