A chiral topological add-drop filter for integrated quantum photonic circuits
Abstract
The integration of quantum emitters within topological nano-photonic devices opens up new avenues for the control of light-matter interactions at the single photon level. Here, we realise a spin-dependent, chiral light-matter interface using individual semiconductor quantum dots embedded in a topological add-drop filter. The filter is imprinted within a valley-Hall photonic crystal (PhC) membrane and comprises a resonator evanescently coupled to a pair of access waveguides. We show that the longitudinal modes of the resonator enable the filter to perform wavelength-selective routing of light, protected by the underlying topology. Furthermore, we demonstrate that for a quantum dot located at a chiral point in the resonator, selective coupling occurs between well-defined spin states and specific output ports of the topological device. This behaviour is fundamental to the operation of chiral devices such as a quantum optical circulator. Our device therefore represents a topologically-protected building block with potential to play an enabling role in the development of chiral integrated quantum photonic circuits.
Keywords
Cite
@article{arxiv.2110.07277,
title = {A chiral topological add-drop filter for integrated quantum photonic circuits},
author = {M. Jalali Mehrabad and A. P. Foster and N. J. Martin and R. Dost and E. Clarke and P. K. Patil and M. S. Skolnick and L. R. Wilson},
journal= {arXiv preprint arXiv:2110.07277},
year = {2023}
}