Triggered Single-Photon Emission of Resonantly Excited Quantum Dots Grown on (111)B GaAs Substrate

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Abstract

In the recent decades, semiconductor quantum dots (QDs) have proven to be valuable candidates as sources for various photonic applications. Of particular interest are, due to their wide-ranging applicability in quantum communication and computation, indistinguishable photons as well as entangled photon pairs, which can be emitted on demand. The latter require highly symmetric QDs with a small to vanishing excitonic fine-structure splitting. Herein, quantum optical properties of QDs grown via molecular-beam epitaxy (MBE) on (111)B-GaAs substrate are reported to study their emission in terms of triggered single-photon emission under quasi-resonant p-shell excitation, and under strict resonant s-shell excitation. The investigations reveal very good emission properties of these types of QDs, especially under s-shell resonant excitation. In fact, the results yield almost background-free triggered single photons with excellent multiphoton suppression associated with g(2)(0) = (0.033 ± 0.027) and a degree of indistinguishability of (41 ± 10)%. The achieved results underline the high optical quality of (111)-QDs and show their high potential for applications in photonic quantum technologies.

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von Helversen, M., Haisler, A. V., Daurtsev, M. P., Dmitriev, D. V., Toropov, A. I., Rodt, S., … Reitzenstein, S. (2022). Triggered Single-Photon Emission of Resonantly Excited Quantum Dots Grown on (111)B GaAs Substrate. Physica Status Solidi - Rapid Research Letters, 16(8). https://doi.org/10.1002/pssr.202200133

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