An electrically driven cavity-enhanced source of indistinguishable photons with 61% overall efficiency
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We report on an electrically driven efficient source of indistinguishable photons operated at pulse-repetition rates f up to 1.2 GHz. The quantum light source is based on a p-i-n-doped micropillar cavity with integrated self-organized quantum dots, which exploits cavity quantum electrodynamics effects in the weak coupling regime to enhance the emission of a single quantum emitter coupled to the cavity mode. We achieve an overall single-photon extraction efficiency of (61 ± 11) % for a device triggered electrically at f = 625 MHz. Analyzing the suppression of multi-photon emission events as a function of excitation repetition rate, we observe single-photon emission associated with g(2)HBT(0) values between 0.076 and 0.227 for f ranging from 373 MHz to 1.2 GHz. Hong-Ou-Mandel-type two-photon interference experiments under pulsed current injection at 487 MHz reveal a photon-indistinguishability of (41.1 ± 9.5) % at a single-photon emission rate of (92 ± 23) MHz.
Schlehahn , A , Thoma , A , Munnelly , P , Kamp , M , Höfling , S , Heindel , T , Schneider , C & Reitzenstein , S 2016 , ' An electrically driven cavity-enhanced source of indistinguishable photons with 61% overall efficiency ' APL Photonics , vol 1 , no. 1 , 011301 . DOI: 10.1063/1.4939831
© 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
This work was financially supported by the German Research Foundation (DFG) under Grants RE2974/9-1 and SCHN1376/1-1 as well as the German Federal Ministry of Education and Research (BMBF) through the VIP-project “QSOURCE”.
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