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

Article

关键词: NEAR-UNITY INDISTINGUISHABILITY;    SOLID-STATE;    MOLLOW TRIPLET;    SEMICONDUCTOR;    FLUORESCENCE;    DEVICE;    GENERATION;    EMITTERS;    BRIGHT;    CAVITY;   

DOI  :  10.1103/PhysRevB.97.195432

来源: SCIE

【 摘 要 】

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 = (99.61(-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.

【 授权许可】

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