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Spin-cavity interactions between a quantum dot molecule and a photonic crystal cavity. | LitMetric

AI Article Synopsis

  • Researchers have successfully integrated InAs/GaAs quantum dots into nanophotonic cavities, advancing the field of cavity quantum electrodynamics, but initial efforts focused mainly on two-level systems.
  • They report a breakthrough with a two-spin-cavity system that embeds an InAs quantum dot molecule in a photonic crystal cavity, achieving a spin singlet-triplet system where the spin splitting is much greater than the cavity linewidth.
  • This setup enables cavity-stimulated Raman emission that is selective to spins and demonstrates the first instances of cavity-enhanced optical nonlinearities, paving the way for more control in quantum networks.

Article 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.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4518300PMC
http://dx.doi.org/10.1038/ncomms8665DOI Listing

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