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Journal Article

Photon sorters and QND detectors using single photon emitters


Witthaut,  Dirk
Max Planck Research Group Network Dynamics, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Witthaut, D., Lukin, M. D., & Srense, A. S. (2012). Photon sorters and QND detectors using single photon emitters. Europhysics Letters, 97(5): 50007. doi:10.1209/0295-5075/97/50007.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0029-10FF-2
We 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 nonlinearities. As a speci c application we show how these elements can be integrated into an error-proof Bell state analyzer, whose e ciency exceeds the best possible performance with linear optics even for a modest atom- eld 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.