2014
DOI: 10.1103/physrevb.89.205312
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Statistical properties of exciton fine structure splitting and polarization angles in quantum dot ensembles

Abstract: We propose an effective model to describe the statistical properties of exciton fine structure splitting (FSS) and polarization angle of quantum dot ensembles (QDEs). We derive the distributions of FSS and polarization angle for QDEs and show that their statistical features can be fully characterized using at most three independent measurable parameters. The effective model is confirmed using atomistic pseudopotential calculations as well as experimental measurements for several rather different QDEs. The mode… Show more

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Cited by 18 publications
(21 citation statements)
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“…Therefore, the FSS in an ELED containing QDs is the key parameter determining the quality of the entangled-photon pairs. Recent work has shown that in standard self-assembled QDs 22 , the probability of finding QDs with a FSS smaller than the radiative linewidth of the X emission (1 μeV) is lower than 10 −2 . This finding implies that as-grown QDs are still impractical for scalable quantum networks.…”
mentioning
confidence: 98%
“…Therefore, the FSS in an ELED containing QDs is the key parameter determining the quality of the entangled-photon pairs. Recent work has shown that in standard self-assembled QDs 22 , the probability of finding QDs with a FSS smaller than the radiative linewidth of the X emission (1 μeV) is lower than 10 −2 . This finding implies that as-grown QDs are still impractical for scalable quantum networks.…”
mentioning
confidence: 98%
“…In spite of these accomplishments, there are two points that are often overlooked: First, in the presence of unavoidable structural asymmetries the anisotropic electron-hole exchange interaction induces a fine structure splitting (FSS; s ) between the intermediate exciton X levels 21 that markedly lowers the degree of entanglement of the source 22 , which eventually emits only classically polarization-correlated photons. Even though methods to suppress the FSS exist 6 23 , advanced quantum optics experiments 24 are still carried out using single ‘hero' QDs that have—for probabilistic reasons 25 —zero FSS. Second, even having at hand a bunch of these special QDs, each of them emits entangled photons at a different random energy, and any attempt to modify these energies via external perturbations restores the FSS, thus spoiling entanglement 10 .…”
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confidence: 99%
“…1(c)]-limits the capability of a QD to generate photon pairs featuring a high entanglement degree [12,24,25]. Recent calculations [26] show that a very low portion of as-grown QDs are free of asymmetries (~10-3) and the numbers increase slightly if sophisticated growth protocols are employed [21]. Therefore, the probability of finding two as-grown QDs for a QR is ~10-9 or less.…”
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confidence: 99%
“…The range of tunability depends on the QD stru ctural details and on the m agnitude o f S, and S2 reachable in practice. Using QD parameters estim ated in previous works [24,26], assuming m axim um values of 5 j andS? ~ 1.8 GPa, and taking into account the experim ental value [42] o f the shift o f the X energy with stress (a = -29 m eV/ GPa, so as to include strain-related effects on the conduction band), we predict that at s = 0 the X energy can be controlled in a range as large as 100 meV [see Fig.…”
mentioning
confidence: 99%