Quantum Optics

For whom
Students, Employees, Alumni, Press, Business
When
03-05-2019 from 12:30 to 14:05
Where
iGent, Technologiepark Zwijnaarde 126, 9052
Language
English
Organizer
Kamal Kaur
Contact
kamalpreet.kaur@ugent.be
Website
https://webappsx.ugent.be/eventManager/events/seminarhubelclemmen
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NB-Photonics seminar by- Hannes Hubel and Stephane Celmmen

Program:

12:30  –  13:00  Sandwich Lunch in Foyer 1.1 on first floor of iGent Tower

13:00  –  13:05  Introduction by Johan Bauwelinck

13:05  –  13:55  Seminar by Hannes Hubel and Stephane Clemmen (iGent AUD)

13:50 – 14:05    Discussion

 

This is a joint seminar by Hannes Hubel from Austrian institute of technology and Stephane Clemmen from UGent.  

Hannes Hübel is the leader of the experimental developments of QKD at the Austrian Institute of Technology. He began his journey into the quantum realm in 2004 as a Post Doc in the group of Anton Zeilinger at the University of Vienna. After that followed a research position at the Institute of Quantum Computing in Waterloo, Canada in 2009. Hannes Hübel held an assistant professorship at the University of Stockholm, Sweden before taking over the Quantum Technologies group at AIT in 2015. 

Stéphane Clemnmen graduated from Université Libre de Bruxelles in 2010. After a postdoc in Cornell University with prof Gaeta and a second postdoc in Universiteit Ghent with prof Roel Baets, he is now a professor at Ghent University and a FNRS-granted researcher at the Université Libre de Bruxelles. His research expertise is in quantum photonics that is the development of optical active devices and circuits specifically for quantum information applications. Examples include photon sources, generation of entanglement, manipulation of individual photons and quantum logic.

 

Hannes will give talk on "Quantum Labs on a chip" followed by Stephane who will give a presentation on "Emitting single photon for sure...but with a probabilistic source"

 

For more details you can refer to the abstracts of the talks below:

The second quantum revolution is set to revolutionize the fields of computing, sensing and communications. I will show the need for optical integration for quantum communication systems, in particular single and entangled photon sources and detection technologies used in quantum key distribution. Different integration platforms together with their merits and weaknesses for quantum communication applications will be reviewed. Finally, I will present a novel approach based on polymer waveguides that are developed in the Quantum Technology Flagship project UNIQORN. The aim is to integrate more functionality on optical chips than ever before and provide small, robust and cost-effective devices for quantum communication applications.

Spontaneous parametric processes are routinely involved in multiphoton quantum experiments because they constitute bright and highly reproducible photon sources. Unfortunately, their nature is to emit probabilistically. Combining many sources emitting probabilistically  is highly inefficient so that sources based on deterministic single emitters appear currently as more appealing despite many constraints. In this presentation, we will see that parametric sources can in fact emit effectively deterministically a single photon and compete with single emitters thanks to an architecture known as active multiplexing of heralded sources.