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.

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Cited by in corpus (6)

• Topological photonics: fundamental concepts, recent developments, and future directions
• Observation of topological frequency combs
• Chiral quantum optics: recent developments, and future directions
• Topological Edge Mode Tapering
• Single-photon transport in a whispering-gallery mode microresonator directionally coupled with a two-level quantum emitter
• Routing single photons with quantum emitters coupled to nanostructures