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.
We report on a quantum dot micropillar-based single-photon source demonstrating tunable emission energy via an applied electric eld and driven by an on-chip, whispering-gallery-mode microlaser. The cavity-enhanced single-photon source is monolithically integrated with an electrically driven, coherent excitation source. The device concept features low laser-threshold currents of a few tens of µA, has a small footprint with a device area of ∼ 200 µm 2 and demonstrates high single-photon purity with g (2) (0) as low as 0.07 ± 0.03 under pulsed electrical excitation of the microlaser. The electric eld applied along the growth direction of the single-photon emitter allows the emission to be tuned by up to 1.1 meV via the quantum-conned Stark eect, bringing it into resonance with the fundamental mode of the surrounding micropillar resonator for enhanced emission via the Purcell eect.
We present a novel compact nanophotonic device consisting of a nonclassical light source excited by a monolithically integrated and electrically driven quantum dot (QD) microlaser. Our device concept is based on self-assembled InAs QDs embedded in micropillar cavities and has many potential applications in the fields of quantum communication and quantum optics-based information processing. Electrically driven micropillars act as whispering gallery mode microlasers operable in both continuous and pulsed mode, with narrow pulse widths of 520 ps and decay constants as low as 160 ps observed. These microlasers are used as on-chip excitation sources to laterally excite individual QDs in nearby micropillars, which in turn act as vertically emitting nonclassical light sources. Our compact solid-state platform utilizes cavity-quantum electrodynamic effects to create antibunched light in continuous and pulsed operation with g (2)C W (0) = 0.76 ± 0.03 and g (2) P u lsed (0) = 0.78 ± 0.11, demonstrating its potential for the generation of triggered single photons in a highly integrated chip.
An integrated optoelectronic feedback system based on semiconductor quantum dot-micropillars is presented. The device consists of an electrically driven microlaser optically coupled to monolithically integrated photodetectors. Via the external amplification and reinjection of the detector photocurrent into the microlaser, self-pulsing in the optoelectronic signal is observed. The feedback-induced self-pulsing is explained qualitatively by a rate equation model, which considers the thermally induced shift in the gain of the laser during pulsing and a Gaussian white-noise term for spontaneous emission. The results show promise for exploring chaos in ultra-compact nanophotonic systems and for technological approaches towards chaos-based secure communication, random number generation, and selfpulsing single photon sources on a highly integrated semiconductor platform.
We demonstrate the on-chip detection of light using photosensitive detectors based on quantum dot micropillar cavities. These microscale detectors are applied exemplarily to probe the emission of a monolithically integrated, electrically pumped whispering gallery mode microlaser. Light is detected via the photocurrent induced in the electrically contacted micropillar detectors under reverse-bias. In order to demonstrate the high potential and applicability of the microdetector presented, we determine the threshold current of an integrated microlaser to be (54 ± 4) μA, in very good agreement with the value of (53 ± 4) μA inferred from the optical data. Within this work, we realize the monolithic integration of a laser and a detector in a single device operating in the regime of cavity-quantum electrodynamics. Our results thus advance the research on microscale sensor technology towards the few-photon quantum limit and pave the way for on-chip opto-electronic feedback experiments.
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