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Updated: Feb 7, 2026

Production and Targeting of Monovalent Quantum Dots
Published on: October 23, 2014
Nonreciprocal Transmission and Reflection of a Chirally Coupled Quantum Dot
D L Hurst1, D M Price1, C Bentham1
1Department of Physics and Astronomy , University of Sheffield , Hounsfield Road , Sheffield , S3 7RH , United Kingdom.
Abstract:
We report strongly nonreciprocal behavior for quantum dot exciton spins coupled to nanophotonic waveguides under resonant laser excitation. A clear dependence of the transmission spectrum on the propagation direction is found for a chirally coupled quantum dot, with spin up and spin down exciton spins coupling to the left and right propagation directions, respectively. The reflection signal shows an opposite trend to the transmission, which a numerical model indicates is due to direction-selective saturation of the quantum dot. The chiral spin-photon interface we demonstrate breaks reciprocity of the system and opens the way to spin-based quantum optical components such as optical diodes and circulators in a chip-based solid-state environment.
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