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Vanishing fine-structure splittings in telecommunication-wavelength quantum dots grown on (111)A surfaces by droplet epitaxy

Abstract : The emission cascade of a single quantum dot is a promising source of entangled photons. A prerequisite for this source is the use of a symmetric dot analogous to an atom in a vacuum, but the simultaneous achievement of structural symmetry and emission in a telecom band poses a challenge. Here we report the growth and characterization of highly symmetric InAs/InAlAs quantum dots self-assembled on C3v symmetric InP(111)A. The broad emission spectra cover the O (λ∼1.3 μm), C (λ∼1.55 μm), and L (λ∼1.6 μm) telecom bands. The distribution of the fine-structure splittings is considerably smaller than those reported in previous works on dots at similar wavelengths. The presence of dots with degenerate exciton lines is further confirmed by the optical orientation technique. Thus, our dot systems are expected to serve as efficient entangled photon emitters for long-distance fiber-based quantum key distribution.
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https://hal.insa-toulouse.fr/hal-02052065
Contributor : Insa Toulouse Scd <>
Submitted on : Thursday, February 28, 2019 - 11:42:40 AM
Last modification on : Tuesday, June 16, 2020 - 3:44:02 PM

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  • HAL Id : hal-02052065, version 1

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Xiangming Liu, Neul Ha, Hideaki Nakajima, Takaaki Mano, Takashi Kuroda, et al.. Vanishing fine-structure splittings in telecommunication-wavelength quantum dots grown on (111)A surfaces by droplet epitaxy. Physical Review B: Condensed Matter and Materials Physics, American Physical Society, 2014, 90 (8). ⟨hal-02052065⟩

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