Optical coupling of two distant InAs/GaAs quantum dots by a photonic-crystal microcavity

Abstract

Long distance $(1.4\text{ }\ensuremath{\mu}\text{m})$ interaction of two different InAs/GaAs quantum dots in a photonic crystal microcavity is observed. Simultaneous coupling of both quantum dots to the cavity is demonstrated by Purcell effect measurements. Resonant optical excitation in the $p$ state of any of the quantum dots, results in an increase in the $s$-state emission of the other one. The cavity-mediated coupling can be controlled by varying the excitation intensity. These results represent an experimental step toward the realization of quantum logic operations using distant solid-state qubits.