Direct sampling of optical coherence using quantum interference

Details Direct sampling of optical coherence using quantum interference Direct sampling of optical coherence using quantum interference

2008-12-15

arxiv.org/abs/0812.2876v1

Physics

Quantum Physics

10 pages, 5 figures

Scientific paper

We describe a detector that measures the mutual coherence of two optical fields directly using quantum interference, free from photon noise of the individual irradiances. Our approach utilizes Raman transition in an atomic system where the state evolution is driven by the mutual coherence of the fields interacting with the atoms. Feedback control is used to balance the interaction of the fields being characterized, providing a measure of the mutual coherence. We show that the sensitivity of the coherence measurement can be enhanced significantly above that of conventional interferometric methods when the mutual coherence of the two fields is weak.

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