OSC Colloquium Lecture Series

    Thursday, September 6, 2018 - 3:45pm
    Optical Sciences - Meinel Aud. #307

    1630 E. University Blvd.

    3rd Floor Lobby area


    Open to campus and public


    Speaker: Dr. Elohim Becerra, University of New Mexico

    Topic: "Optimized Photon Counting Measurements for Coherent State Discrimination"

    Visit our website for future lecture dates and speaker information: http://www.optics.arizona.edu/news-events/events/colloquium For a list of our archived lectures: http://www.optics.arizona.edu/news-events/events/colloquium/archive


    Efficient and reliable measurements for the discrimination of nonorthogonal states of light are a critical element for quantum and classical communications. The intrinsic quantum noise in coherent states of light sets the achievable sensitivity limits of any measurement aiming to distinguish among different states, and ultimately bounds the amount of information in classical communication. At the same time, this intrinsic noise makes coherent states non-orthogonal, which means these states can be used in quantum key distribution for secret communications. Here I describe our work on nonconventional measurement strategies for coherent states of light based on photon counting that can surpass the conventional limits of detection, such as the heterodyne and homodyne limits. We investigate optimized strategies based on photon number resolution and adaptive detection that allow for increasing robustness and measurement sensitivities. I will describe or experimental demonstrations of these optimized discrimination strategies for surpassing the conventional limits of detection under noise and loss encountered in communication links.

    Speaker Bio(s): 

    Francisco Elohim Becerra works in the field of experimental quantum optics and quantum information. He received his PhD degree in 2009 from CINVESTAV, Mexico, performing his PhD research work at the University of Maryland in experimental quantum optics and atomic physics in the generation of entangled photons for quantum communication. He was a postdoctoral researcher at the National Institute of Standards and Technology from 2010 to 2013 performing research on quantum measurements and nonconventional detection methods. In 2013, he joined the Department of Physics and Astronomy at the University of New Mexico (UNM) as an Assistant Professor. His current research involves quantum measurements for efficient optical communications with coherent states, and quantum optics with atomic physics for long distance quantum communications with high capacity, sources of entangled photons and quantum memories.


    Refreshments 3:30pm

    Lecture @ 3:45pm - 5pm

    Hosted by: Poul Jessen