Using chirped laser pulses and a magnetic field to control dark excitons in semiconductor quantum dots

https://www.eurekalert.org/news-releases/1089946

"bright/ accessible excitons emit light... dark excitons optically inactive, so have significantly longer life making ideal for storing/ controlling quantum states, generating entanglement... manipulate excitons' spin state in controlled manner/ transform bright excitons into dark ones, can also reverse process by further laser pulse.... can be kept in dark state for prolonged time, reactivated later... control of quantum memories and the generation of entangled photon pairs in quantum dots"

Related: IEEE study achieves efficient integration of quantum dot lasers on silicon chiplets
https://www.eurekalert.org/news-releases/1091524