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Publication - Dr Dara McCutcheon

    Intrinsic and environmental effects on the interference properties of a high-performance quantum dot single-photon source

    Citation

    Gerhardt, S, Iles-Smith, J, McCutcheon, DP, He, YM, 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, vol 97.

    Abstract

    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=(99.6-1.4+0.4)%. 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.

    Full details in the University publications repository