Patent ID: 8525149
Filing Date: 2013-09-03
Classification: B82Y,H01L

Abstract:
1. A photon source comprising: a quantum dot; electrical contacts configured to apply an electric field across said quantum dot: and an electrical source coupled to said contacts, said electrical source being configured to apply a first voltage at which electrons and holes are injected into said quantum dot to form a bi-exciton or higher order exciton, and a second voltage at which injection of electrons and holes is stopped, wherein said photon source further comprises a barrier configured to increase the time which an electron or hole takes to tunnel to or from said quantum dot to be greater than the radiative lifetime of an exciton in the quantum dot when the second voltage is applied, the quantum dot being suitable for emission of entangled pairs of photons during decay of a bi-exciton or higher order exciton.