Abstract
We demonstrate non-perturbative coupling between a single self-assembled InGaAs quantum dot and an external fiber-mirror-based microcavity. Our results extend the previous realizations of tunable microcavities while ensuring spatial and spectral overlap between the cavity mode and the emitter by simultaneously allowing for deterministic charge control of the quantum dots. Using resonant spectroscopy, we show that the coupled quantum dot cavity system is at the onset of strong coupling, with a cooperativity parameter of C ≈ 2.0 ± 1.3. Our results constitute a milestone in the progress toward the realization of a high-efficiency solid-state spin–photon interface.
Highlights
The interaction between a quantum emitter and a single optical cavity mode, termed cavity quantum electrodynamics (QED), has enabled a number of key experimental advances in quantum optics, including the observation of enhancement of spontaneous emission [1], demonstration of the photon blockade effect [2] and vacuum induced transparency [3]
In this Article, we demonstrate C = 2 by coupling excitonic transitions of single self-assembled quantum dots (QD) to a hybrid cavity structure which consists of a GaAs/AlAs-based distributed Bragg reflector (DBR) mirror below the QD layer, and a curved fiber-end mirror approached from the top
We have presented a very versatile QD-microcavity platform for performing state-of-the-art cavity QED experiments
Summary
The interaction between a quantum emitter and a single optical cavity mode, termed cavity quantum electrodynamics (QED), has enabled a number of key experimental advances in quantum optics, including the observation of enhancement of spontaneous emission [1], demonstration of the photon blockade effect [2] and vacuum induced transparency [3]. A technologically very relevant all-solid-state cavity QED platform in the optical domain consists of quantum dots (QD) coupled to nano-fabricated cavities For these integrated devices achieving spectral and spatial overlap has been a major challenge. Even though techniques that overcome these limitations using state-of-the-art nanotechnology methods have been demonstrated, a flexible cavity design where large C can be achieved for every QD would greatly improve the prospects for novel solid-state cavity-QED experiments In this Article, we demonstrate C = 2 by coupling excitonic transitions of single self-assembled QDs to a hybrid cavity structure which consists of a GaAs/AlAs-based distributed Bragg reflector (DBR) mirror below the QD layer, and a curved fiber-end mirror approached from the top. We demonstrate a fully tunable spin-cavity-QED system requiring a minimum of technological steps, together with fiber-coupled optical output, that can in principle satisfy the high collection efficiency requirement of quantum information processing protocols
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