Experimental realization of quantum cryptosystem over 87 km
Tetsuya Hasegawa, T. Nishioka, Hirokazu Ishizuka, J. Abe, M. Matsui, Shigeki Takeuchi · 2003
We have successfully implemented telecom-wavelength quantum cryptosystem over 87.5 km (world's longest) including error correction and privacy amplification. We confirmed that key distribution was performed at a rate of 7.2 bps with a 7.6% QBER.