Long-distance radiative coupling between quantum dots in photonic crystal dimers

Abstract

We study the mutual interaction between two identical quantum dots coupled to the normal modes of two-site photonic crystal molecules in a planar waveguide geometry, i.e. photonic crystal dimers. We find that the radiative coupling between the two quantum emitters is maximized when they are in resonance with either the bonding or the antibonding modes of the coupled cavity system. Moreover, we find that such effective interdot coupling is sizable, in the meV range, and almost independent from the cavities distance, as long as a normal mode splitting exceeding the radiative linewidth can be established (strong cavity-cavity coupling condition). In realistic and high quality factor photonic crystal cavity devices, such distance can largely exceed the emission wavelength, which is promising for long distance entanglement generation between two qubits in an integrated nanophotonic platform. We show that these results are robust against position disorder of the two quantum emitters within their respective cavities.

10 pages, 6 figures

References in corpus (9)

• Photonic quantum technologies
• Quantum nature of a strongly-coupled single quantum dot-cavity system
• Single photons from coupled quantum modes
• On the origin of strong photon antibunching in weakly nonlinear photonic molecules
• Photonic-crystal slabs with a triangular lattice of triangular holes investigated using a guided-mode expansion method
• The quantum optical Josephson interferometer
• Photon correlations in a two-site non-linear cavity system under coherent drive and dissipation
• Radiative coupling of quantum dots in photonic crystal structures
• Ultralong-range radiative excitation transfer between quantum dots in a planar microcavity