Coherence effects in quantum optics yesterday, today and tomorrow
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abstract
Historically, coherence effects such as the Hanle effect, quantum beats, and coherent population trapping served to define the physics of the field. Applications of phase coherent media have yielded electromagnetically induced transparency (EIT), lasers operating without population inversion (LWI), quantum noise suppression through correlated emission laser, and ultraslow light having a group velocity of a few meter per second. In the near future, new physics and devices are likely to be developed.
