Non-Reciprocal Transmission and Reflection of a Chirally-Coupled Quantum Dot

Abstract

We report strongly non-reciprocal behaviour for quantum dot exciton spins coupled to nano-photonic 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.

19 pages, 4 figures, supplemental information available on request

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• Chiral Quantum Optics
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• A chiral one-dimensional atom using a quantum dot in an open microcavity
• Unidirectional transmission of single photons under non-ideal chiral photon-atom interactions
• Nonreciprocal Quantum Transport at Junctions of Structured Leads
• Generating maximal entanglement between spectrally distinct solid-state emitters
• Waveguide Excitation and Spin Pumping of Chirally Coupled Quantum Dots
• Unidirectional coupling of a quantum emitter to a subwavelength grating waveguide with engineered stationary inflection point
• Modelling spatio-temporal dynamics of chiral coupling of quantum emitters to light fields in nanophotonic structures