Abstract
Resonant excitation of solid state quantum emitters has the potential to deterministically excite a localized exciton while ensuring a maximally coherent emission. In this work, we demonstrate the coherent coupling of an exciton localized in a lithographically positioned, site-controlled semiconductor quantum dot to an external resonant laser field. For strong continuous-wave driving we observe the characteristic Mollow triplet and analyze the Rabi splitting and sideband widths as a function of driving strength and temperature. The sideband widths increase linearly with temperature and the square of the driving strength, which we explain via coupling of the exciton to longitudinal acoustic phonons. We also find an increase of the Rabi splitting with temperature, which indicates a temperature induced delocalization of the excitonic wave function resulting in an increase of the oscillator strength. Finally, we demonstrate coherent control of the exciton excited state population via pulsed resonant excitation and observe a damping of the Rabi oscillations with increasing pulse area, which is consistent with our exciton-photon coupling model. We believe that our work outlines the possibility to implement fully scalable platforms of solid state quantum emitters. The latter is one of the key prerequisites for more advanced, integrated nanophotonic quantum circuits.
Highlights
Semiconductor self-assembled quantum dots (QDs) are prime candidates for solid state quantum emitters [1,2]
The suppressed peak around τ ≈ 0 ns is a clear signature for single photon emission from our site-controlled QD (SCQD)
We have shown for the first time, to the best of our knowledge, the coherent coupling of a resonant laser field to the excitonic state of a SCQD
Summary
Semiconductor self-assembled quantum dots (QDs) are prime candidates for solid state quantum emitters [1,2]. Many groundbreaking experiments have shown their great potential, e.g., in quantum key distribution experiments [3,4], the demonstration of spin–photon entanglement [5,6], and the emission of highly indistinguishable single photons [7,8]. While single photon emission [18,19] and the emission of indistinguishable [20] and polarization entangled photons [21] in this system have been demonstrated, the implementation of resonant fluorescence in this system remains elusive. Resonant coupling of a laser to the quantum emitter, is key toward the emission of single photons with high indistinguishability and to coherently control the state of the excitonic qubit. We observe the characteristic Mollow triplet [22,23,24] in the resonance fluorescence spectra under continuous-wave excitation conditions, and demonstrate the coherent control of the excited
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