An electrically driven cavity-enhanced source of indistinguishable photons with 61% overall efficiency

• Published in: APL photonics Vol. 1; no. 1; pp. 011301 - 011301-6
• Main Authors: Schlehahn, A., Thoma, A., Munnelly, P., Kamp, M., Höfling, S., Heindel, T., Schneider, C., Reitzenstein, S.
• Format: Journal Article
• Language: English
• Published: AIP Publishing LLC 01.04.2016
• ISSN: 2378-0967; 2378-0967
• DOI: 10.1063/1.4939831

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.