Highly Efficient Organic Single-Photon Source Operating at Cryogenic Temperatures

The generation of on-demand single- and N-photon states is highly attractive for optical quantum technologies. However, collecting photons with a near-unity efficiency remains a significant challenge, especially in the context of single emitters at cryogenic temperatures. In order to increase collection efficiency, planar antennas have been extensively explored in the last decade, demonstrating near-unity photon collection efficiencies from various quantum emitters at room temperature [1], [2]. Here, we present the cryogenic implementation of a metallo-dielectric antenna for organic molecules with lifetime-limited linewidths and indefinite photostability.