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Quantum Optics, at the heart of quantum metrology and quantum information

Date:  Thursday, May 2nd, 2019

Time: 4:00pm

Location:100 Willamette Hall

Speaker: Nicolas Treps, Laboratoire Kastler Brossel, Sorbonne Universite

Abstract: Light has always been an invaluable tool for high precision measurements, and the corresponding sensitivity limits a very active research field. These limits arise from a complex interplay between light fundamental properties, such as its wave nature for the Rayleigh criteria, and the detection systems, delivering an intensity map. But quantitative limits can be set only when one consider noise, whatever its origin, and thus ultimately it is the quantum nature of light that governs the fundamental limits to sensitivity.

Quantum Optics emerged when experimentally it became possible to operate optical non-linearities acting directly on the quantum fluctuations, and thus on the spatio-temporal distribution of the photons. It was then demonstrated that the use of non-classical light light fields can improve the sensitivity of interferometers, for instance. But the possibility to master exotic light quantum state expend applicability beyond quantum metrology. Information carried by quantum light can be utilised for quantum communications of even quantum computing. Hence, in the same way that light was used to demonstrate the basic principle of quantum mechanics, we expect that it will be a cornerstone of quantum technologies.

During this talk, I will review the main concepts that make light such an invaluable tool for quantum technologies. I will then focus on the continuous variable approach and optical frequency combs, where the measurement of the electric field on its many frequency degrees of freedom allow for the multiplexing of quantum information and an interplay between quantum and classical application.

Host: Brian Smith

All attendees are invited to attend a colloquium reception in the Willamette Hall, Paul Olum atrium at 3:40pm.

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