Experimental Quantum Cryptography with Qutrits

Details Experimental Quantum Cryptography with Qutrits Experimental Quantum Cryptography with Qutrits

2005-11-16

arxiv.org/abs/quant-ph/0511163v2

New J. Phys. 8 (2006) 75

Physics

Quantum Physics

New version includes additional references and a few minor changes to the manuscript

Scientific paper

10.1088/1367-2630/8/5/075

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 %.

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