High-efficiency quantum interrogation measurements via the quantum Zeno effect

A. G. White (1); A. Zeilinger (2) ((1) Los Alamos National Laboratory (2) University of Innsbruck); G. Weihs (2); H. Weinfurter (2); J. R. Mitchell (1); O. Nairz (2); P. G. Kwiat (1)

High-efficiency quantum interrogation measurements via the quantum Zeno effect

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arxiv quant-ph/9909083 v1 pith:BOCRKOFB submitted 1999-09-27 quant-ph

P. G. Kwiat (1) , A. G. White (1) , J. R. Mitchell (1) , O. Nairz (2) , G. Weihs (2) , H. Weinfurter (2) , A. Zeilinger (2) ((1) Los Alamos National Laboratory (2) University of Innsbruck) This is my paper · ORCID

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keywords quantumefficiencieseffectinterrogationlightobjectzenoabsorbed

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The phenomenon of quantum interrogation allows one to optically detect the presence of an absorbing object, without the measuring light interacting with it. In an application of the quantum Zeno effect, the object inhibits the otherwise coherent evolution of the light, such that the probability that an interrogating photon is absorbed can in principle be arbitrarily small. We have implemented this technique, demonstrating efficiencies exceeding the 50% theoretical-maximum of the original ``interaction-free'' measurement proposal. We have also predicted and experimentally verified a previously unsuspected dependence on loss; efficiencies of up to 73% were observed and the feasibility of efficiencies up to 85% was demonstrated.

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