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Field-Intensity Correlations of Light

Date: 2018-01-18
Time: 14:30
Venue: 中科院物理研究所M楼253会议室
Speaker: Professor Luis A. Orozco

Joint Quantum Institute, Department of Physics, University of Maryland and NIST

The nature of light is a topic that has animated discussions in physics since the time of Isaac Newton. The argument of wave versus particle is resolved in quantum electrodynamics by a formalism that combines both of these aspects.The formalism is fundamentally statistical, and as with quantum phenomena in general, it is through the statistical uncertainty, fluctuations that the wave and particle natures of light sit selfconsistently side by side. Two lines of experiments have been followed: those measuring the particle aspect of light (correlations between pairs of photon detection using the Hanbury Brown and Twiss technique) and those studying the wave aspect of light (squeezing experiments that measure the fluctuation variance of the wave amplitude). No attempt has previously been made to draw on the particle and wave aspects together by correlating a photon detection with fluctuations of the electromagnetic wave amplitude.
I will present the formalism of the field-intensity correlation, third order on the field, and show how we have managed to measure this correlation, using as a source a cavity QED system. The source is known to emit nonclassical light; this has been demonstrated in both photon correlation and squeezing measurements. We now have a way to observe the fluctuation of the wave amplitude of light underlying these measurements by exploiting the conditioning on a photon detection to catch it as it occurs. This correlation function in its relations to the field (wave) – intensity(particle) opens interesting possibilities in quantum information and quantum feedback.

Luis A. Orozco was born in Guadalajara, Mexico in 1958. He completed his engineering studies at the Instituto Tecnológicoy de Estudios Superiores de Occidente in Guadalajara, Mexico and his postgraduate studies at the University of Texas at Austin, obtaining his doctorate in 1987. He held a postdoctoral position at Harvard working at CERN, Switzerland. He returned to the United States and worked from 1991 to 2003 as a professor in the physics department of the State University of New York at Stony Brook. Since 2003, he is a professor of physics at the University of Maryland in College Park, MD, USA, where he is co-director of the Physics Frontier Center of the Joint Quantum Institute. Throughout his career Dr. Orozco has been Guggenheim Fellow (1998), Fellow of the American Physical Society (2000) Fellow of the Optical Society of America (2003), Fellow of the Institute of Physics, UK (2005), Distinguished Traveling Lecturer of the American Physical Society (2002-20017) and corresponding member of the Academia Mexicana de Ciencias since (2005). He has an Honoris Causa Doctorate from INAOE, Mexico (2016). He has graduated 23 PhD students and more than 60 undergraduates have worked in his group. Together with his students and collaborators he is author of more than 100 publications. As a researcher, he is interested in quantum optics, quantum information, fundamental symmetry tests, and high precision spectroscopy.

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联系人: 陆 凌 研究员 (Tel:82649203)