Highly efficient electrically triggered quantum dot micropillar single photon source

We present electrically triggered single photon emission from low mode volume quantum dot-micropillar cavities at operating frequencies of up to 220 MHz. Due to an optimized layout of the doped planar microcavity and an advanced lateral current injection scheme, highly efficient single photon sources featuring g(2)(0)-values well below 0.5 and a Purcell factor of 4 are realized. Single photon emission at a rate as high as (47.0±6.9) MHz with a corresponding overall efficiency of (21.4±3.1) % is demonstrated for a 2.0 μm-diameter device.