High-efficiency quantum interrogation measurements via the quantum Zeno effect

Details High-efficiency quantum interrogation measurements via the quantum Zeno effect High-efficiency quantum interrogation measurements via the quantum Zeno effect

1999-09-27

arxiv.org/abs/quant-ph/9909083v1

Physical Review Letters 83, no. 23, pp. 4725-4728 (1999).

Physics

Quantum Physics

4 pages, 3 postscript figures. To appear in Phys. Rev. Lett; submitted June 11, 1999

Scientific paper

10.1103/PhysRevLett.83.4725

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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