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

Stefan Gerhardt*, Jake Iles-Smith, Dara P.S. McCutcheon, Yu Ming He, Sebastian Unsleber, Simon Betzold, Niels Gregersen, Jesper Mørk, Sven Höfling, Christian Schneider

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

14 Citations (Scopus)
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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.

Original languageEnglish
Article number195432
JournalPhysical Review B
Volume97
Issue number19
DOIs
Publication statusPublished - 18 May 2018

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