By performing a full analysis of the projected local density of states (LDOS) in a photonic crystal waveguide, we show that phase plays a crucial role in the symmetry of the light-matter interaction. By considering a quantum dot (QD) spin coupled to a photonic crystal waveguide (PCW) mode, we demonstrate that the light-matter interaction can be asymmetric, leading to unidirectional emission and a deterministic entangled photon source. Further we show that understanding the phase associated with both the LDOS and the QD spin is essential for a range of devices that that can be realised with a QD in a PCW. We also show how quantum entanglement can completely reverse photon propagation direction, and highlight a fundamental breakdown of the semiclassical dipole approximation for describing light-matter interactions in these spin dependent systems.
@article{arxiv.1406.0714,
title = {Polarization engineering in photonic crystal waveguides for spin-photon entanglers},
author = {Andrew B. Young and Arthur Thijssen and Daryl M. Beggs and Petros Androvitsaneas and L. Kuipers and John G. Rarity and Stephen Hughes and Ruth Oulton},
journal= {arXiv preprint arXiv:1406.0714},
year = {2015}
}
Comments
Updated version fixes some errors. The main changes have come in the second half of the paper, with a more in depth treatment of the scattering from dipoles inside the PCW