Two-photon interference from remote quantum dots with inhomogeneously broadened linewidths
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In this paper, we study the influence of quasiresonant and nonresonant excitation on the interference properties of single photons emitted from quantum dots (QDs). The quasiresonant excitation scheme leads to an increase of interference visibility of photons emitted from the same QD to 69% compared to 12% for nonresonant excitation. Furthermore, we demonstrate quantum interference of photons emitted from separate QDs which are simultaneously excited into their p shell. We can readily extract a two-photon interference visibility as high as (39 ± 2)% for nonpostselected coincidences exceeding the predicted value based on coherence and radiative decay times of the quantum dot emission (similar to 25%). We account for this observation by treating the emission of both quantum dots as inhomogeneously broadened ensembles of Fourier-limited photons and observe good congruence between experiment and model.
Gold , P , Thoma , A , Maier , S , Reitzenstein , S , Schneider , C , Hoefling , S & Kamp , M 2014 , ' Two-photon interference from remote quantum dots with inhomogeneously broadened linewidths ' Physical Review. B, Condensed matter and materials physics , vol 89 , no. 3 , 035313 . DOI: 10.1103/PhysRevB.89.035313
Physical Review. B, Condensed matter and materials physics
©2014 American Physical Society. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at https://dx.doi.org/10.1103/PhysRevB.89.035313.
This work was financially supported by the German Ministry of Education and Research (BMBF) via the project QuaHL-Rep and by the State of Bavaria.