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Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Measurement and modification of biexciton-exciton time correlation from an InAs quantum dot

Tobias Huber, Ana Predojević, Harishankar Jayakumar, Glenn S. Solomon, Gregor Weihs

Published May 1, 2011• 1 citation
Publisher

Abstract

Entangled photon pairs are an essential tool for various quantum protocols as teleportation [1], entanglement swapping [2], and realisation of quantum gates [3]. The traditional way to produce entangled photon pairs is the spontaneous parametric downconversion [4]. These sources are well developed and reliable. However, the number of photon pairs emitted in downconversion obey the thermal distribution.

DOI
10.1109/cleoe.2011.5943409

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Entangled photon pairs are an essential tool for various quantum protocols as teleportation [1], entanglement swapping [2], and realisation of quantum gates [3]. The traditional way to produce entangled photon pairs is the spontaneous parametric downconversion [4]. These sources are well developed and reliable. However, the number of photon pairs emitted in downconversion obey the thermal distribution.
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Photons which are generated in a two-photon cascade process have an underlying time correlation since the spontaneous emission of the upper level populates the intermediate state. This correlation leads to a reduction of the purity of the photon emitted from the intermediate state. Here we characterize this time correlation for the biexciton-exciton cascade of an InAs/GaAs quantum dot. We show that the correlation can be reduced by tuning the biexciton transition in resonance to a planar distributed Bragg reflector cavity. The enhanced and inhibited emission into the cavity accelerates the biexciton emission and slows down the exciton emission thus reduces the correlation and increases the purity of the exciton photon. This is essential for schemes like creating time-bin entangled photon pairs from quantum dot systems.