Group Seminar via Zoom: Photon Routing and Switching using Cavity QED

August 11, 2020

Harjot Singh, JQI
Group meeting via video conference (Zoom)
Tuesday, August 11th, 15:00 (MEZ)

Dealing with the unique situation of partial lock downs worldwide and home office solutions at our Institute due to the current spreading of the Covid 19 virus, we are now holding our group seminars and journal clubs via video conference. This procedure enables us to continue our research, enhance discussions and exchange important information.


Cavity quantum electrodynamics (QED) is widely used for applications in quantum and classical optical information processing. I will focus on the application of photon routing and switching. When these applications are performed using the photon blockade effect of cavity QED systems, there is a fundamental limit to their efficiency. This fundamental limit was studied by Rosenblum et. al. by considering the problem of routing 2 indistinguishable photons to different ports. I will develop on their results and show that this limit can be exceeded by making use of linear optics. I will also consider the problem of single photon switching and present arguments for why we need 3 level systems in a cavity to perform this task. I will give a brief description of the results using charged InAs quantum dots in 2D photonic crystal cavities, and point out the possible improvements. I will present the work I have done so far in working on these improvements.

If you would like to join our group seminars via Zoom, please contact us for more information.

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