Inter-site collaboration demonstrates wavelength conversion of single photons emitted by semiconductor quantum dots
ML4Q researchers from Bonn and Jülich have published recent results in Optics Letters on wavelength conversion at the single-photon level – a process required to forge a quantum network from distinct quantum devices. Such devices include solid-state emitters of single or entangled photons, as well as network nodes based on atoms or ions.
In this study, the authors demonstrate the conversion of single photons emitted from a semiconductor quantum dot at 853 nm via sum frequency conversion to the wavelength of the strong transition of Yb+ ions at 370 nm. They also show that the single-photon character of the quantum dot emission is preserved during the conversion process.
Publication: Anica Hamer, David Fricker, Marcel Hohn, Paola Atkinson, Mihail Lepsa, Stefan Linden, Frank Vewinger, Beata Kardynal, and Simon Stellmer, “Converting single photons from an InAs/GaAs quantum dot into the ultraviolet: preservation of second-order correlations,” Opt. Lett. 47, 1778-1781 (2022)