Inter-site collaboration demonstrates wavelength conversion of single photons emitted by semiconductor quantum dots


Schematic overview of the experimental setup, sub- divided into the single photon source (green), the frequency conversion module with the excitation laser (yellow), and the detection module for converted photons (blue). (Figure 1 of the publication)

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)


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