Experimental quantum cryptography with qutrits
2006; IOP Publishing; Volume: 8; Issue: 5 Linguagem: Inglês
10.1088/1367-2630/8/5/075
ISSN1367-2630
AutoresSimon Gröblacher, Thomas Jennewein, Alipasha Vaziri, Gregor Weihs, Anton Zeilinger,
Tópico(s)Quantum Mechanics and Applications
ResumoWe 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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