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Scott Lecture II : Counting and controlling photons non-destructively.

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Usually photons are destroyed when they are detected. Photon demolition is however not a fate required by quantum principles. An atomic clock operating with Rydberg atoms counts photons non destructively, directly revealing the quantum jumps of the electromagnetic field. By implementing quantum feedback methods, radiation states with well defined photon numbers can be prepared and maintained in a cavity for an arbitrary time. These atomic physics experiments are now extended in the domain of condensed matter physics, the Rydberg atoms being replaced by artificial atoms made of Josephson junction circuits. Applications to quantum information science will be discussed.

This talk is part of the Scott Lectures series.

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