Robert J Young et al 2006 New J. Phys. 8 29 doi:10.1088/1367-2630/8/2/029
Improved fidelity of triggered entangled photons from single quantum dots
Robert J Young1,3, R Mark Stevenson1, Paola Atkinson2, Ken Cooper2, David A Ritchie2 and Andrew J Shields1
Show affiliationsWe 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 
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.
- PACS
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42.50.Dv Quantum state engineering and measurements
03.67.Mn Entanglement measures, witnesses, and other characterizations
- Subjects
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Condensed matter: electrical, magnetic and optical
Optics, quantum optics and lasers
- Dates
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Issue 2 (February 2006)
Received 30 January 2006
Published 23 February 2006
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Improved fidelity of triggered entangled photons from single quantum dots
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