



01587nas a2200217   4500008004100000245005800041210005700099260001400156520092600170100003001096700002401126700002801150700002101178700002401199700002301223700001901246700002501265700002401290700001801314856003701332       2021                        eng d00aTunable three-body loss in a nonlinear Rydberg medium0 aTunable threebody loss in a nonlinear Rydberg medium  c9/28/20203 a<p>Long-range Rydberg interactions, in combination with electromagnetically induced transparency (EIT), give rise to strongly interacting photons where the strength, sign, and form of the interactions are widely tunable and controllable. Such control can be applied to both coherent and dissipative interactions, which provides the potential to generate novel few-photon states. Recently it has been shown that Rydberg-EIT is a rare system in which three-body interactions can be as strong or stronger than two-body interactions. In this work, we study a three-body scattering loss for Rydberg-EIT in a wide regime of single and two-photon detunings. Our numerical simulations of the full three-body wavefunction and analytical estimates based on Fermi&#39;s Golden Rule strongly suggest that the observed features in the outgoing photonic correlations are caused by the resonant enhancement of the three-body losses.</p>1 aHuerta, Dalia, P. Ornelas1 aBienias, Przemyslaw1 aCraddock, Alexander, N.1 aGullans, Michael1 aHachtel, Andrew, J.1 aKalinowski, Marcin1 aLyon, Mary, E.1 aGorshkov, Alexey, V.1 aRolston, Steven, L.1 aPorto, J., V.  uhttps://arxiv.org/abs/2009.1359901697nas a2200205   4500008004100000245010900041210006900150260001300219520100800232100003001240700002801270700003101298700002401329700001601353700001601369700002501385700002301410700002101433856003701454       2020                        eng d00aOn-demand indistinguishable single photons from an efficient and pure source based on a Rydberg ensemble0 aOndemand indistinguishable single photons from an efficient and   c3/4/20203 a<p>Single photons coupled to atomic systems have shown to be a promising platform for developing quantum technologies. Yet a bright on-demand, highly pure and highly indistinguishable single-photon source compatible with atomic platforms is lacking. In this work, we demonstrate such a source based on a strongly interacting Rydberg system. The large optical nonlinearities in a blockaded Rydberg ensemble convert coherent light into a single-collective excitation that can be coherently retrieved as a quantum field. We observe a single-transverse-mode efficiency up to 0.18(2), g(2)=2.0(1.5)&times;10&minus;4, and indistinguishability of 0.982(7), making this system promising for scalable quantum information applications. Accounting for losses, we infer a generation probability up to 0.40(4). Furthermore, we investigate the effects of contaminant Rydberg excitations on the source efficiency. Finally, we introduce metrics to benchmark the performance of on-demand single-photon sources.&nbsp;</p>1 aOrnelas-Huerta, Dalia, P.1 aCraddock, Alexander, N.1 aGoldschmidt, Elizabeth, A.1 aHachtel, Andrew, J.1 aWang, Yidan1 aBienias, P.1 aGorshkov, Alexey, V.1 aRolston, Steve, L.1 aPorto, James, V.  uhttps://arxiv.org/abs/2003.02202