Improved fidelity of triggered entangled photons from single quantum dots

Details Improved fidelity of triggered entangled photons from single quantum dots Improved fidelity of triggered entangled photons from single quantum dots

2006-01-27

arxiv.org/abs/quant-ph/0601187v2

New J. Phys. 8, 29 (2006)

Physics

Quantum Physics

9 pages. Paper is available free of charge at http://www.iop.org/EJ/abstract/1367-2630/8/2/029/, see also 'A semiconductor s

Scientific paper

10.1088/1367-2630/8/2/029

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.

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