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

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  • Patrick M. Vora

    (NRC research associate residing at the Naval Research Laboratory
    Present Address: George Mason University, Fairfax, Virginia 22030, USA.)

  • 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)

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.

Suggested Citation

  • 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 & Daniel Gammon, 2015. "Spin–cavity interactions between a quantum dot molecule and a photonic crystal cavity," Nature Communications, Nature, vol. 6(1), pages 1-9, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8665
    DOI: 10.1038/ncomms8665
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