Spin–cavity interactions between a quantum dot molecule and a photonic crystal cavity

Patrick M. Vora (), Allan S. Bracker, Samuel G. Carter, Timothy M. Sweeney, Mijin Kim, Chul Soo Kim, Lily Yang, Peter G. Brereton, Sophia E. Economou and Daniel Gammon
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Patrick M. Vora: NRC research associate residing at the Naval Research Laboratory
Allan S. Bracker: Naval Research Laboratory
Samuel G. Carter: Naval Research Laboratory
Timothy M. Sweeney: NRC research associate residing at the Naval Research Laboratory
Mijin Kim: Sotera Defense Solutions Inc.
Chul Soo Kim: Naval Research Laboratory
Lily Yang: NRC research associate residing at the Naval Research Laboratory
Peter G. Brereton: US Naval Academy
Sophia E. Economou: Naval Research Laboratory
Daniel Gammon: Naval Research Laboratory

Nature Communications, 2015, vol. 6, issue 1, 1-9

Abstract: Abstract The integration of InAs/GaAs quantum dots into nanophotonic cavities has led to impressive demonstrations of cavity quantum electrodynamics. However, these demonstrations are primarily based on two-level excitonic systems. Efforts to couple long-lived quantum dot electron spin states with a cavity are only now succeeding. Here we report a two-spin–cavity system, achieved by embedding an InAs quantum dot molecule within a photonic crystal cavity. With this system we obtain a spin singlet–triplet Λ-system where the ground-state spin splitting exceeds the cavity linewidth by an order of magnitude. This allows us to observe cavity-stimulated Raman emission that is highly spin-selective. Moreover, we demonstrate the first cases of cavity-enhanced optical nonlinearities in a solid-state Λ-system. This provides an all-optical, local method to control the spin exchange splitting. Incorporation of a highly engineerable quantum dot molecule into the photonic crystal architecture advances prospects for a quantum network.

Date: 2015
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DOI: 10.1038/ncomms8665

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