Single entangled photon pair emission from an InGaAs/GaAs quantum dot up to temperatures of 30 K
| R. Hafenbrak, S. M. Ulrich, L. Wang, A. Rastelli, O. G. Schmidt, P. Michler Phys. Status Solidi C 6, 389 (2009) URL PDF |
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| Abstract | ||
| Photon pairs emitted from the biexciton-exciton cascade of a single self-assembled InGaAs/GaAs quantum dot can be polarization-entangled. The degree of entanglement is reduced by the fine structure splitting of the involved exciton level. We measure this splitting in high resolution using a scanning Fabry-Perot interferometer. By quantum state tomography we can determine the two photon polarization state. We are able to verify the conditions of entangled or classically correlated photon pairs in full consistence with the observed fine structure splittings. The entanglement remains relatively unaffected for elevated sample temperatures where we observe reliable entanglement up to 30 K. |