Preprint article · Journal article
Intrinsic and environmental effects on the interference properties of a high-performance quantum dot single-photon source
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.
Language: | English |
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Year: | 2018 |
Pages: | 12 |
ISSN: | 24699969 , 24699950 , 1550235x and 10980121 |
Types: | Preprint article and Journal article |
DOI: | 10.1103/PhysRevB.97.195432 |
ORCIDs: | Gregersen, Niels and Mørk, Jesper |