Colloquia & Guest Speakers
Spatial Quantum Correlations in the Macroscopic Regime
Dr. Alberto Marino Valle
Monday, November 21, 2016
Goergen Hall, Room 101
The study of the spatial quantum correlations in entangled beams of light has become an active research area due to the role that these quantum correlations play in the field of quantum imaging, which promises to improve optical resolution and image detection and to enhance quantum communications through parallel quantum information encoding. The presence of spatial quantum correlations is a result of momentum conservation and an indication that the entangled beams are composed of multiple spatial modes. In this talk I will show that non-degenerate four-wave mixing (FWM) in a double-lambda configuration in a rubidium vapor cell is an excellent source of continuous-variable (CV) entangled twin beams with a large number of spatial modes. I will describe some of the spatial quantum properties of the twin beams generated by the FWM process. In particular, I will show how the size of the spatial correlations, or coherence area, can be controlled through a change in the size and profile of the pump required for the FWM. The coherence area places a limit on quantum imaging applications and is ultimately linked to the number of spatial modes that make up the entangled beams. Finally, I will present results on the direct measurement of the spatial quantum correlations with a high quantum efficiency CCD camera in the macroscopic regime.
Alberto Marino is an Assistant Professor at the University of Oklahoma. His research focuses on experimental quantum optics, with particular emphasis on its applications to quantum information science and quantum metrology. Before arriving at the University of Oklahoma, he held a postdoctoral position and then an Assistant Research Scientist position at the Joint Quantum Institute (NIST/University of Maryland). He obtained an M.S. and a Ph.D. in optics from the Institute of Optics at the University of Rochester.
Refreshments will be served.