Experimental Quantum Cryptography with Qutrits
摘要
We produce two identical keys using, for the first time, entangled trinary quantum systems (qutrits) for quantum key distribution. The advantage of qutrits over the normally used binary quantum systems is an increased coding density and a higher security margin. The qutrits are encoded into the orbital angular momentum of photons, namely Laguerre-Gaussian modes with azimuthal index l +1, 0 and -1, respectively. The orbital angular momentum is controlled with phase holograms. In an Ekert-type protocol the violation of a three-dimensional Bell inequality verifies the security of the generated keys. A key is obtained with a qutrit error rate of approximately 10 %.
引用
@article{arxiv.quant-ph/0511163,
title = {Experimental Quantum Cryptography with Qutrits},
author = {Simon Groeblacher and Thomas Jennewein and Alipasha Vaziri and Gregor Weihs and Anton Zeilinger},
journal= {arXiv preprint arXiv:quant-ph/0511163},
year = {2007}
}
备注
New version includes additional references and a few minor changes to the manuscript