Photons Emitted by Quantum Dots Can be Made Indistinguishable Through Quantum Frequency Conversion

An international collaboration led by researchers from the NIST Center for Nanoscale Science and Technology has demonstrated the ability to make photons emitted by quantum dots at different frequencies identical to each other by shifting their frequencies to match. This “quantum frequency conversion” is an important step for making solid-state, single photon sources, including quantum dots, more useful light sources for photonic quantum information science.