Quantum communication using single photons from a semiconductor quantum dot emitting at a telecommunication wavelength
P. M. Intallura, M. B. Ward, O. Z. Karimov, Zhiliang L. Yuan, Patrick See, P. Atkinson, D. A. Ritchie, Andrew J. Shields · Journal of Optics A Pure and Applied Optics · 2009
Quantum key distribution with single photons from a telecommunication-wavelength quantum dot source is performed over a standard optical fibre link. The source was operated at a temperature of 70 K and gave g(2)(0)~0.166 with an efficiency of 5% after coupling into the single-mode fibre. Correlation results are quoted without subtraction of detector dark counts and g(2)(0) as low as 0.1 was measured, at reduced efficiency. This source enabled a proof-of-principle demonstration of quantum key distribution over 35 km of fibre using the BB84 protocol and phase encoding.