title: Enhancement of Rydberg-mediated single-photon nonlinearities by electrically tuned Förster resonances.
abstract: Mapping the strong interaction between Rydberg atoms onto single photons via electromagnetically induced transparency enables manipulation of light at the single-photon level and few-photon devices such as all-optical switches and transistors operated by individual photons. Here we demonstrate experimentally that Stark-tuned Förster resonances can substantially increase this effective interaction between individual photons. This technique boosts the gain of a single-photon transistor to over 100, enhances the non-destructive detection of single Rydberg atoms to a fidelity beyond 0.8, and enables high-precision spectroscopy on Rydberg pair states. On top, we achieve a gain larger than 2 with gate photon read-out after the transistor operation. Theory models for Rydberg polariton propagation on Förster resonance and for the projection of the stored spin-wave yield excellent agreement to our data and successfully identify the main decoherence mechanism of the Rydberg transistor, paving the way towards photonic quantum gates.
authors: 5th Institute of Physics and Center for Integrated Quantum Science and Technology, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany.
authors: H
authors: H
authors: Gorniaczyk
authors: 5th Institute of Physics and Center for Integrated Quantum Science and Technology, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany.
authors: C
authors: C
authors: Tresp
authors: Institute for Theoretical Physics III and Center for Integrated Quantum Science and Technology, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany.
authors: P
authors: P
authors: Bienias
authors: 5th Institute of Physics and Center for Integrated Quantum Science and Technology, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany.
authors: A
authors: A
authors: Paris-Mandoki
authors: School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK.
authors: W
authors: 0000-0001-6731-1311
authors: W
authors: Li
authors: 5th Institute of Physics and Center for Integrated Quantum Science and Technology, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany.
authors: I
authors: I
authors: Mirgorodskiy
authors: Institute for Theoretical Physics III and Center for Integrated Quantum Science and Technology, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany.
authors: H P
authors: HP
authors: Büchler
authors: School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK.
authors: I
authors: I
authors: Lesanovsky
authors: 5th Institute of Physics and Center for Integrated Quantum Science and Technology, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany.
authors: S
authors: 0000-0003-0309-9715
authors: S
authors: Hofferberth