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

S Gerhardt, J Iles-Smith, D McCutcheon, Y He, S Unsleber, S Betzold, N Gregersen, J Mørk, Sven Höfling, C Schneider

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18 Citations (Scopus)

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^+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.
Original languageEnglish
Article number195432
Number of pages10
JournalPhysical Review. B, Condensed matter and materials physics
Volume97
Issue number19
DOIs
Publication statusPublished - 15 May 2018

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