Highly indistinguishable on-demand resonance fluorescence photons from a deterministic quantum dot micropillar device with 74% extraction efficiency.

Sebastian Unsleber,Jian-Wei Pan,Niels Gregersen,Chao-Yang Lu,Christian Schneider,Sven Höfling,Sebastian Maier,Stefan Gerhardt,Martin Kamp,Yu-Ming He

doi:10.1364/oe.24.008539

Abstract

The implementation and engineering of bright and coherent solid state quantum light sources is key for the realization of both on chip and remote quantum networks. Despite tremendous efforts for more than 15 years, the combination of these two key prerequisites in a single, potentially scalable device is a major challenge. Here, we report on the observation of bright single photon emission generated via pulsed, resonance fluorescence conditions from a single quantum dot (QD) deterministically centered in a micropillar cavity device via cryogenic optical lithography. The brightness of the QD fluorescence is greatly enhanced on resonance with the fundamental mode of the pillar, leading to an overall device efficiency of η = (74 ± 4) % for a single photon emission as pure as g(2)(0) = 0.0092 ± 0.0004. The combination of large Purcell enhancement and resonant pumping conditions allows us to observe a two-photon wave packet overlap up to ν = (88 ± 3) %.

Highlights

Building compact and bright solid state sources of on-demand and Fourier-limited single photons is a major challenge in engineering quantum emitters and solid state microcavities [1]
We report on the observation of bright single photon emission generated via pulsed, resonance fluorescence conditions from a single quantum dot (QD) deterministically centered in a micropillar cavity device via cryogenic optical lithography
We have discussed the implementation of a QD based single photon source based on a micropillar aligned to a pre-selected QD via cryogenic optical lithography

Summary

Introduction

Building compact and bright solid state sources of on-demand and Fourier-limited single photons is a major challenge in engineering quantum emitters and solid state microcavities [1]. Equal timing requires an excitation technique which minimizes time jittering of the emission event, while maximizing the wave packet overlap requires close-to Fourier limited photons. In principal, the latter can be achieved more easy using the Purcell effect to enhance the emission rate of the emitter [18]. While single photon streams can be generated from a single quantum dot under non-resonant or quasi-resonant excitation conditions, it has been recognized that resonance fluorescence excitation is the most suitable configuration to simultaneously minimize time jittering and maximize coherence [19, 20]

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Results

Conclusion