Science Daily June 24, 2022
An international team of researchers (Switzerland, Germany) built and successfully interfaced a single-photon source based on cavity-enhanced spontaneous parametric down-conversion in periodically poled potassium titanyl phosphate and a matched memory based on electromagnetically induced transparency in warm 87Rb vapor. The bandwidth of the photons emitted by the source was 370MHz, which is within the accepted bandwidth of the memory. The experimental complexity was kept low, with all components operating at or above room temperature. Read-out noise of the memory was considerably reduced by exploiting polarization selection rules in the hyperfine structure of spin-polarized atoms. They demonstrated single-photon storage and retrieval in a ground-state vapor cell memory, demonstrating the single-photon character of the retrieved light. According to the researchers the platform of single-photon source and atomic memory is attractive for future experiments on room-temperature quantum networks operating at high bandwidth…read more. Open Access TECHNICAL ARTICLEÂ
Basic scheme of the experiment… Credit: PRX Quantum 3, 020349, 7 June 2022Â