Electron teleportation between quantum dots using virtual dark exciton

Abstract

We here propose a mechanism to teleport electrons between quantum dots through the transformation of a virtual bright exciton into a dark exciton. This mechanism relies on the interactions of two composite bosons: a pair of electrons with opposite spins, trapped in two dots and an electron-hole pair in a free exciton coupled to an unabsorbed pump pulse, which makes it ``bright'' but virtual. This bright exciton first turns ``dark'' by dropping its electron and stealing the trapped electron with opposite spin through an exchange Coulomb process with the trapped pair. In a second step, the dark exciton ``flies'' with its electron to the other dot where it turns bright again, by the inverse process. The ``Shiva diagrams'' for composite boson many-body effects that we have recently introduced, enlighten this understanding.