Phys.org April 7, 2022
Spin can be also used as the medium for quantum communication by transferring quantum information with light. But the process of transferring information to the spin of extremely small electrons is challenging and must be performed efficiently. An international team of researchers (Japan, Canada, Germany) has realized the world’s first GaAs gate-controlled quantum dot circuit on a (110)-oriented surface that promises to increase photon-electron spin conversion efficiency. This has the effect of encoding quantum information from incident photons into the electron spins. Because of the way the hole interacts with the GaAs crystal lattice, the g-factor, which helps determine the magnetic moment resulting from the spin, can effectively be different in different cryptographic orientations. This feature allows for the efficient conversion of quantum information by using a heavy hole state, which used to be impossible for conventional substrates…read more. Open Access TECHNICAL ARTICLE
Scanning electron micrograph of DQD device showing active gates on the surface of the (110)-oriented GaAs/AlGaAs QW structure. Credit: Journal of Applied Physics 131, 134305 (2022)Â