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

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

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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 + 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
JournalPhysical Review B (Condensed Matter and Materials Physics)
Volume97
Number of pages10
ISSN1098-0121
DOIs
Publication statusPublished - 2018

Cite this

Gerhardt, Stefan ; Iles-Smith, Jake ; McCutcheon, Dara ; He, Yu-Ming ; Unsleber, Sebastian ; Betzold, Simon ; Gregersen, Niels ; Mørk, Jesper ; Höfling, Sven ; Schneider, Christian. / Intrinsic and environmental effects on the interference properties of a high-performance quantum dot single-photon source. In: Physical Review B (Condensed Matter and Materials Physics). 2018 ; Vol. 97.
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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 acorresponding 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.",
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Intrinsic and environmental effects on the interference properties of a high-performance quantum dot single-photon source. / Gerhardt, Stefan; Iles-Smith, Jake; McCutcheon, Dara; He, Yu-Ming; Unsleber, Sebastian; Betzold, Simon; Gregersen, Niels; Mørk, Jesper; Höfling, Sven; Schneider, Christian.

In: Physical Review B (Condensed Matter and Materials Physics), Vol. 97, 195432, 2018.

Research output: Contribution to journalJournal articleResearchpeer-review

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AU - Gerhardt, Stefan

AU - Iles-Smith, Jake

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AU - He, Yu-Ming

AU - Unsleber, Sebastian

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AU - Höfling, Sven

AU - Schneider, Christian

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N2 - 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 acorresponding 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.

AB - 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 acorresponding 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.

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