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PGI Colloquium:

Prof. Dr. Edo Waks,
University of Maryland, College Park, USA

PGI Lecture Hall, Building 04.8, 2nd Floor, Room 365

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02 Dec 2019 14:00

Quantum Nanophotonics: Controlling Light with a Single Spin

Abstract: Interactions between light and matter lie at the heart of optical communication and information processing. Nanophotonic devices enhance light-matter interactions by confining photons to small mode volumes, enabling devices to operate at significantly lower energies.  In the strong coupling regime these interactions are sufficiently large to generate a nonlinear response with a single photon, an essential component for quantum information processing applications.  In this talk I will describe our effort to couple spin to light using nanophotonics. I will discuss an experimental demonstration of a quantum transistor, a fundamental building block for quantum computers and quantum networks, using a single electron spin that strongly interact with light through a nanophotonic cavity.  This device enables the spin to switch a single photon, and a single photon to flip the spin. I will discuss how the nanophotonic transistor can realize high fidelity all-optical spin readout, as well as a single photon transistor where one control photon can switch many signal photons. Finally, I will describe our recent effort to extend our results into the telecommunication wavelengths, and to integrate multiple devices on a chip to assemble integrated quantum photonic circuits.

Contact

PD Dr. Alexander Pawlis
Phone: +49 2461 61-2077
Fax: +49 2461 61-2333
email: a.pawlis@fz-juelich.de

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