Controlling the polarisation correlation of photon pairs from a charge-tuneable quantum dot

Correlation between the rectilinear polarisations of the photons emitted from the biexciton decay in a single quantum dot is investigated in a device which allows the charge-state of the dot to be controlled. Optimising emission from the neutral exciton states maximises the operating efficiency of t...

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Bibliographic Details
Published inarXiv.org
Main Authors Young, R J, Dewhurst, S J, Stevenson, R M, Shields, A J, Atkinson, P, Cooper, K, Ritchie, D A
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 06.06.2007
Subjects
Correlation
Decay
Electron spin
Emissions control
Excitons
Photons
Physics - Quantum Physics
Quantum dots
Quantum theory
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Summary:Correlation between the rectilinear polarisations of the photons emitted from the biexciton decay in a single quantum dot is investigated in a device which allows the charge-state of the dot to be controlled. Optimising emission from the neutral exciton states maximises the operating efficiency of the biexciton decay. This is important for single dot applications such as a triggered source of entangled photons. As the bias on the device is reduced correlation between the two photons is found to fall dramatically as emission from the negatively charged exciton becomes significant. Lifetime measurements demonstrate that electronic spin-scattering is the likely cause.
ISSN:2331-8422
DOI:10.48550/arxiv.0706.0853