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

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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Cited by in corpus (7)

• Quantum dots for photonic quantum information technology
• Optical properties of circular Bragg gratings with labyrinth geometry to enable electrical contacts
• High-performance designs for fiber-pigtailed quantum-light sources based on quantum dots in electrically-controlled circular Bragg gratings
• Polarized and Un-Polarized Emission from a Single Emitter in a Bullseye Resonator
• Circular photonic crystal grating design for charge-tunable quantum light sources in the telecom C-band
• Post-fabrication tuning of circular Bragg resonators for enhanced emitter-cavity coupling
• Purcell enhanced and tunable single-photon emission at telecom wavelengths from InAs quantum dots in circular photonic crystal resonators