Doering, Daniel; McDonald, Gordon; Debs, John; Figl, Cristina; Altin, Paul; Bachor, Hans; Robins, Nicholas; Close, John
Every measurement of the population in an uncorrelated ensemble of two-level systems is limited by what is known as the quantum projection noise limit. Here, we present quantum-projection-noise-limited performance of a Ramsey-type interferometer using freely propagating coherent atoms. The experimental setup is based on an electro-optic modulator in an inherently stable Sagnac interferometer, optically coupling the two interfering atomic states via a two-photon Raman transition. Going beyond...[Show more]
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