US Patent Issued on March 3 for "Single-photon source emitting single-photon with controllable circular polarization direction" (Massachusetts Inventor)

ALEXANDRIA, Va., March 3 -- United States Patent no. 12,567,721, issued on March 3.

"Single-photon source emitting single-photon with controllable circular polarization direction" was invented by Yuan Lu (Cambridge, Mass.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is a single-photon source emitting light with controllable circular polarization direction. A pillar structure above a semiconductor substrate includes a semiconductor single-quantum-dot structure. A spin injection layer is arranged above the pillar structure. A pulsed voltage is applied between the spin injection layer and the semiconductor substrate to inject a spin-polarized single-carrier from the spin injection layer into the sem...