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Originally published in Science Express on 13 December 2001
Science 4 January 2002:
Vol. 295. no. 5552, pp. 102 - 105
DOI: 10.1126/science.1066790
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Reports

Electrically Driven Single-Photon Source

Zhiliang Yuan,1 Beata E. Kardynal,1 R. Mark Stevenson,1 Andrew J. Shields,1* Charlene J. Lobo,2 Ken Cooper,2 Neil S. Beattie,12 David A. Ritchie,2 Michael Pepper12

Electroluminescence from a single quantum dot within the intrinsic region of a p-i-n junction is shown to act as an electrically driven single-photon source. At low injection currents, the dot electroluminescence spectrum reveals a single sharp line due to exciton recombination, while another line due to the biexciton emerges at higher currents. The second-order correlation function of the diode displays anti-bunching under a continuous drive current. Single-photon emission is stimulated by subnanosecond voltage pulses. These results suggest that semiconductor technology can be used to mass-produce a single-photon source for applications in quantum information technology.

1 Toshiba Research Europe Limited, Cambridge Research Laboratory, 260 Cambridge Science Park, Milton Road, Cambridge, CB4 0WE, UK.
2 Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge, CB3 0HE, UK.
*   To whom correspondence should be addressed: E-mail: andrew.shields{at}crl.toshiba.co.uk

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