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Biphoton interference with a quantum dot source of entangled light

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  • A. J. Hudson
  • R. M. Stevenson
  • R. J. Young
  • P. Atkinson
  • K. Cooper
  • D. A. Ritchie
  • A. J. Shields
<mark>Journal publication date</mark>04/2008
<mark>Journal</mark>Physica E: Low-dimensional Systems and Nanostructures
Issue number6
Number of pages3
Pages (from-to)1888-1890
<mark>Original language</mark>English


We demonstrate optical interferometry beyond the limits imposed by the photon wavelength using 'triggered' entangled photon pairs from a semiconductor quantum dot. Interference fringes of the entangled biphoton state reveals a periodicity half of that obtained with the single photon, and much less than that of the pump laser. High fringe visibility indicates that biphoton interference is less sensitive to decoherence than interference of two sequential single photons. The results suggest that quantum interferometry may be possible using a semiconductor LED-like device. (C) 2007 Elsevier B.V. All rights reserved.