Experimental free-space quantum networks and satellite quantum communication

24 03/2014

Monday, 24 Mar. 2014, 14:00 - 15:00

Workgroup Walther Group

Presenter: Evan Meyer-Scott
Host: P. Walther
Where: Christian-Doppler-Hörsaal, 3rd floor, Boltzmanngasse 5, 1090 Vienna

I will speak about two projects at the Institute for Quantum Computing on free-space quantum communication.

The first is a recent experiment on tripartite quantum nonlocality. Many tests of quantum nonlocality have studied pairs of correlated particles, but recent interest is pushing the experimental frontier to test larger systems. We showed for the first time a violation of Mermin’s inequality while closing the locality and freedom-of-choice loopholes, by measuring three-photon GHZ states with independent observers at remote locations. I will detail our experimental configuration and results.

The second is a large‐scale theoretical and experimental effort towards launching a Canadian quantum satellite. I will present the proposed mission format and our software and hardware developments, providing automated polarization alignment and post-processing for quantum key distribution. Finally, I will detail our results on high-loss quantum key distribution and the expected satellite performance.