Optical transparency induced by a largely Purcell-enhanced quantum dot in a polarization-degenerate cavity

• URL: http://arxiv.org/abs/2111.13653v4
• Date: Tue, 20 Sep 2022 17:45:35 GMT
• Title: Optical transparency induced by a largely Purcell-enhanced quantum dot in a polarization-degenerate cavity
• Authors: Harjot Singh, Demitry Farfurnik, Zhouchen Luo, Allan S. Bracker, Samuel G. Carter, and Edo Waks
• Abstract summary: Optically-active spin systems coupled to photonic cavities with high cooperativity can generate strong light-matter interactions. We demonstrate coupling with cooperativity as high as $8$ of an InAs/GaAs quantum dot to a fabricated bullseye cavity.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Optically-active spin systems coupled to photonic cavities with high cooperativity can generate strong light-matter interactions, a key ingredient in quantum networks. But obtaining high cooperativities for quantum information processing often involves the use of photonic crystal cavities that feature a poor optical access from the free space, especially to circularly polarized light required for the coherent control of the spin. Here, we demonstrate coupling with cooperativity as high as $8$ of an InAs/GaAs quantum dot to a fabricated bullseye cavity that provides nearly degenerate and Gaussian polarization modes for efficient optical accessing. We observe spontaneous emission lifetimes of the quantum dot as short as $80$ ps (a $\approx 15$ Purcell enhancement) and a $\approx 80\%$ transparency of light reflected from the cavity. Leveraging the induced transparency for photon switching while coherently controlling the quantum dot spin could contribute to ongoing efforts of establishing quantum networks.

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