Free-Space Quantum Electrodynamics with a Single Rydberg Superatom

In a recent experiment we have investigated the interaction of a propagating few-photon field interacting with an single two-plus-one level system. The system was realized by collectively coupling thousands of atoms to a Rydberg state in order to form a Rydberg superatom.

A. Paris-Mandoki, C. Braun, J. Kumlin, C. Tresp, I. Mirgorodskiy, F. Christaller, H. P. Büchler, and S. Hofferberth
Free-Space Quantum Electrodynamics with a Single Rydberg Superatom
Phys. Rev. X 7, 41010 (2017)

Back in business

Within 6 months, we have rebuilt our Rydberg apparatus from scratch in our new lab. What was a completely empty room in early April is now the coolest place (2 μK) at SDU. We are currently putting the last touches on our Rydberg excitation system, then we are ready to go! You can see some pictures from the new lab and of the first steps towards single-photon interaction at SDU here.

New Master Student

Nina Stiesdal has joined us as the first new Master student at our new home SDU. She will join the Rydberg superatom experiment for the next 10 months! Velkommen til holdet!

Results on EIT with Rydberg molecules published in PRA

Our work investigating the role of Rydberg molecules in storage and retrieval of single photons has been published in PRA:

I. Mirgorodskiy, F. Christaller, C. Braun, A. Paris-Mandoki, C. Tresp and S. Hofferberth,
”Electromagnetically induced transparency of ultra-long-range Rydberg molecules”
Phys. Rev. A, 96, 011402 (2017)

Very similar results had previously been observed in the MPQ Quantum Dynamics group!

Calculations of Rydberg interaction potentials

Our manuscript on the calculation of full Rydberg-Rydberg interaction potentials including angular dependencies and external electric and magnetic fields is now published as a tutorial paper in J. Phy.s B. Have a look at the published article J. Phys. B, 50, 13 or the preprint arXiv:1612.08053 !

On top, we provide the software for the calculation of such interaction potentials as an open-source project. Both the source code as well as installers for Windows, Linux and Mac OS are freely available at
github. For information about future releases and updates to the software, you can sign our mailing list there.

New results published in PRL!

Our work realizing a single-photon absorber was published in PRL and is featured as an editor’s suggestion!

If you are interested how we saturate a dense atomic sample with one photon and make it transparent for up to 35 subsequent
photons, please take a read.

C. Tresp, C. Zimmer, I. Mirgorodskiy, H. Gorniaczyk, A. Paris-Mandoki, & S. Hofferberth,
Single-Photon Absorber Based on Strongly Interacting Rydberg Atoms,
Phys. Rev. Lett. 117, 223001 (2016)

Enhancement of Rydberg-mediated single-photon nonlinearities by electrically tuned Förster resonances

title pic

We are very happy to announce the publication of our work on electrically tuned Förster resonances on Nature Communications. If you are interested in how these resonances boost the nonlinearity on the single photon level, have a read (open access)!

H. Gorniaczyk, C. Tresp, P. Bienias, A. Paris-Mandoki, W. Li, I. Mirgorodskiy, H. P. Büchler, I. Lesanovsky & S. Hofferberth,
Enhancement of Rydberg-mediated single-photon nonlinearities by electrically tuned Förster resonances,
Nature Communications 7, 12480 (2016)