Electric field tuning of excitonic fine-structure splitting in asymmetric InAs/InP nanowire quantum dot molecules

We use an atomistic model to show that coupling between two nanowire quantum dots, forming an artificial molecule, can be used to control bright exciton splitting in these systems with external electric field and even reduce it to zero or reverse it. Importantly, strong interdot coupling allows this reduction to occur without a simultaneous detrimental reduction of excitonic optical activity, which is inherently present in weakly coupled systems. Our results indicate that nanowire quantum dot molecules could form a promising platform for quantum dot--based entanglement generation.