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Improved fidelity of triggered entangled photons from single quantum dots

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  • Robert J. Young
  • R. Mark Stevenson
  • Paola Atkinson
  • Ken Cooper
  • David A. Ritchie
  • Andrew J. Shields
Article number29
<mark>Journal publication date</mark>23/02/2006
<mark>Journal</mark>New Journal of Physics
Issue number2
Number of pages9
Publication StatusPublished
<mark>Original language</mark>English


We demonstrate the triggered emission of polarization-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])/root 2 state that we determine is sufficient to satisfy numerous tests for entanglement. The improved quality of entanglement represents a significant step towards the realization of a practical quantum dot source compatible with applications in quantum information.