Colloquium - Fast Light & the Advancement of Quantum Correlations

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Venue:CP 220

Dr. Ryan Glasser National Institute of Standards & Technology Rockville, Maryland

Abstract: Quantum states of light have been shown to provide improvements in a variety of systems, resulting in provably secure communication, sub-shot noise interferometry, and computation schemes that scale better with resources than when using classical means. A key aspect of these entangled and squeezed states of light is that they exhibit correlations that are stronger than allowed classically. Due to the important role these quantum correlations play in the field of quantum optics, numerous investigations into their fundamental behavior have taken place. For example, how such states evolve when propagating through a slow light medium, in which the group velocity of light is less than the speed of light in vacuum, c, have been conducted in the past. We seek to investigate how quantum correlations behave when propagating through a medium exhibiting anomalous dispersion. In such a medium, optical pulses may propagate with group velocities that are larger than c, or even negative. In this talk I will show that by using a nondegenerate four-wave mixing (4WM) process in warm rubidium vapor, which may be used to generate squeezed and entangled states of light, it is possible to generate pulses with negative group velocities. I will show that the same system can support the fast light propagation of images, and with a slight modification may operate as a multi-spatial-mode phase-sensitive amplifier. Finally, I will discuss recent results characterizing the behavior of quantum correlations in the presence of a fast light medium, and conclude with a discussion of possible future research involving the 4WM system.