Abstract
We report on the observation of bright emission of single photons under pulsed resonance fluorescence conditions from a single quantum dot (QD) in a micropillar cavity. The brightness of the QD fluorescence is greatly enhanced via the coupling to the fundamental mode of a micropillar, allowing us to determine a single photon extraction efficiency of (20.7 ± 0.8) % per linear polarization basis. This yields an overall extraction efficiency of (41.4 ± 1.5) % in our device. We observe the first Rabi-oscillation in a weakly coupled quantum dot-micropillar system under coherent pulsed optical excitation, which enables us to deterministically populate the excited QD state. In this configuration, we probe the single photon statistics of the device yielding g(2)(0) = 0.072 ± 0.011 at a QD-cavity detuning of 75 μeV.
Highlights
Bright, efficient sources of single photons are key elements for quantum optics applications, including quantum networks [1], linear optical quantum computing [2, 3] and quantum teleportation [4, 5]
We report on the observation of bright emission of single photons under pulsed resonance fluorescence conditions from a single quantum dot (QD) in a micropillar cavity
The resonant cavity approach enhances the spontaneous emission rate of single QDs via cavity quantum electrodynamics, and as such can lead to significantly increased operation frequencies and is a viable tool to improve the indistinguishability of emitted photons [17, 31]
Summary
Efficient sources of single photons are key elements for quantum optics applications, including quantum networks [1], linear optical quantum computing [2, 3] and quantum teleportation [4, 5]. QD-based single photon sources suffer from poor photon extraction efficiencies (similar to other solid state approaches), since only a minor fraction of the photons can leave the high refractive index material This problem can be mitigated by integrating QDs into optical microcavities [20, 24,25,26] or photonic waveguides [27,28,29,30], where overall extraction efficiencies up to ≈ 0.8 photons per pulse have been demonstrated. We present results on the coherent control and deterministic injection of a QD exciton in the micropillar with a quality factor (Q-factor) of 5950 and a Purcell factor of FP = 3.0 ± 0.6 This allows us to detect single photons on demand from the resonantly driven system, with an overall extraction efficiency of the device up to ηext = (41.4 ± 1.5)% characterized by a low two photon probability of g(2)(0) = 0.072 ± 0.011. We study the dynamics of the coupled system via measuring the dependence of the Rabi-oscillations for different QD-cavity and QD-laser detunings
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