Deterministic photon pairs and coherent optical control of a single quantum dot

H Jayakumar, A Predojević, T Huber, T Kauten… - Physical review …, 2013 - APS
Physical review letters, 2013APS
The strong confinement of semiconductor excitons in a quantum dot gives rise to atomlike
behavior. The full benefit of such a structure is best observed in resonant excitation where
the excited state can be deterministically populated and coherently manipulated. Because of
the large refractive index and device geometry it remains challenging to observe resonantly
excited emission that is free from laser scattering in III/V self-assembled quantum dots. Here
we exploit the biexciton binding energy to create an extremely clean single photon source …
The strong confinement of semiconductor excitons in a quantum dot gives rise to atomlike behavior. The full benefit of such a structure is best observed in resonant excitation where the excited state can be deterministically populated and coherently manipulated. Because of the large refractive index and device geometry it remains challenging to observe resonantly excited emission that is free from laser scattering in III/V self-assembled quantum dots. Here we exploit the biexciton binding energy to create an extremely clean single photon source via two-photon resonant excitation of an quantum dot. We observe complete suppression of the excitation laser and multiphoton emissions. Additionally, we perform <?format ?>full coherent control of the ground-biexciton state qubit and observe an extended coherence time using an all-optical echo technique. The deterministic coherent photon pair creation makes this system suitable for the generation of time-bin entanglement and experiments on the interaction of photons from dissimilar sources.
American Physical Society
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