Intrinsic and environmental effects on the interference properties of a high-performance quantum dot single-photon source
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We report a joint experimental and theoretical study of the interference properties of a single-photon source based on a In(Ga)As quantum dot embedded in a quasiplanar GaAs microcavity. Using resonant laser excitation with a pulse separation of 2 ns, we find near-perfect interference of the emitted photons, and a corresponding indistinguishability of I=(99.6^+0.4_−1.4)%. For larger pulse separations, quasiresonant excitation conditions, increasing pump power, or with increasing temperature, the interference contrast is progressively and notably reduced. We present a systematic study of the relevant dephasing mechanisms and explain our results in the framework of a microscopic model of our system. For strictly resonant excitation, we show that photon indistinguishability is independent of pump power, but strongly influenced by virtual phonon-assisted processes which are not evident in excitonic Rabi oscillations.
Gerhardt , S , Iles-Smith , J , McCutcheon , D , He , Y , Unsleber , S , Betzold , S , Gregersen , N , Mørk , J , Höfling , S & Schneider , C 2018 , ' Intrinsic and environmental effects on the interference properties of a high-performance quantum dot single-photon source ' Physical Review. B, Condensed matter and materials physics , vol. 97 , no. 19 , 195432 . https://doi.org/10.1103/PhysRevB.97.195432
Physical Review. B, Condensed matter and materials physics
© 2018, American Physical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1103/PhysRevB.97.195432
DescriptionWe acknowledge support by the State of Bavaria and the German Ministry of Education and Research (BMBF) within the project Q.com. J.I.-S. and J.M. acknowledge support from the Danish Research Council (DFF-4181-00416) and Villum Fonden (NATEC Centre). This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 703193.
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