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Q: Fachverband Quantenoptik und Photonik

Q 66: Quantum Information: Photons and Nonclassical Light III

Q 66.3: Vortrag

Freitag, 12. März 2010, 14:30–14:45, E 214

Efficient error-proof Bell measurements for photons by coupling to a single emitter — •Dirk Witthaut^1,2, Mikhail D. Lukin³, and Anders S. Sørensen¹ — ¹QUANTOP, Niels Bohr Institute, University of Copenhagen, Denmark — ²Max-Planck-Institute for Dynamics and Self-Organisation, Göttingen, Germany — ³Department of Physics, Harvard University, Cambridge, USA

We present an efficient error-proof Bell state analyzer composed of linear optical elements and a non-linear element provided by the coupling to a single emitter, which can be realized in a photonic microcavity or a surface plasmon polariton mode on a nanowire. The setup is error-proof in the sense that every detection event projects unambiguously onto one of the Bell states, and losses may lead to inconclusive, but never to wrong measurement outcomes. Even more, a large class of errors results in a full transmission of all photons, so that they can be recycled for another attempt. Efficiencies exceeding the best possible performance with linear optics are shown to be achievable with modest atom-field coupling and a simple optical setup.