Improved fidelity of triggered entangled photons from single quantum dots
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Open Access
- 1 February 2006
- journal article
- Published by IOP Publishing in New Journal of Physics
- Vol. 8 (2), 29
- https://doi.org/10.1088/1367-2630/8/2/029
Abstract
We demonstrate the on-demand emission of polarisation-entangled photon pairs from the biexciton cascade of a single InAs quantum dot embedded in a GaAs/AlAs planar microcavity. Improvements in the sample design blue shifts the wetting layer to reduce the contribution of background light in the measurements. Results presented show that >70% of the detected photon pairs are entangled. The high fidelity of the (|HxxHx>+|VxxVx>)/2^0.5 state that we determine is sufficient to satisfy numerous tests for entanglement. The improved quality of entanglement represents a significant step towards the realisation of a practical quantum dot source compatible with applications in quantum information.Keywords
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