Applied Physics

Quantum Networking

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Science  27 May 2005:
Vol. 308, Issue 5726, pp. 1229
DOI: 10.1126/science.308.5726.1229c

The ability to send single photons down optical fibers offers the possibility of secure communications over existing fiber networks. One challenge has been to find single-photon sources that emit at the telecom wavelengths of 1300 nm. The emission wavelength of quantum dots can be tuned by controlling their size, making them ideal candidates for further study. On the other hand, infrared communication wavelengths would require the dots to be relatively large; under typical growth conditions, this would require a longer growth time, resulting in a high density of dots on the surface and a large number of single-photon sources. By carefully adjusting the growth conditions, Ward et al. show that they can whittle down and isolate the number of emitters to just one, thereby providing a practical source of single photons for quantum communication over fiber-optic networks. — ISO

Appl. Phys. Lett. 86, 201111 (2005).

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