Optical Transparency Induced by a Largely Purcell Enhanced Quantum Dot in a Polarization-Degenerate Cavity
- Harjot SinghHarjot SinghDepartment of Electrical and Computer Engineering, Institute for Research in Electronics and Applied Physics, and Joint Quantum Institute, University of Maryland, College Park, Maryland 20742, United StatesMore by Harjot Singh
- Demitry Farfurnik*Demitry Farfurnik*Email for D.F.: [email protected]Department of Electrical and Computer Engineering, Institute for Research in Electronics and Applied Physics, and Joint Quantum Institute, University of Maryland, College Park, Maryland 20742, United StatesMore by Demitry Farfurnik
- Zhouchen Luo
- Allan S. BrackerAllan S. BrackerNaval Research Laboratory, 4555 Overlook Avenue SW, Washington, D.C. 20375, United StatesMore by Allan S. Bracker
- Samuel G. CarterSamuel G. CarterNaval Research Laboratory, 4555 Overlook Avenue SW, Washington, D.C. 20375, United StatesMore by Samuel G. Carter
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- Edo Waks
Optically active spin systems coupled to photonic cavities with high cooperativity can generate strong light–matter interactions, a key ingredient in quantum networks. However, 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 a 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 (an ∼15 Purcell enhancement) and a ∼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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