Journal article Open Access

Higher-Dimensional Quantum Cryptography

Bradley Christensen; Kevin T. McCusker; Daniel J. Gauthier; Daniel Kumor; Venkat Chandar; P. G. Kwiat

We report on a high-speed quantum cryptography system that utilizes simultaneous entanglement in polarization and in "time-bins". With multiple degrees of freedom contributing to the secret key, we can achieve over ten bits of random entropy per detected coincidence. In addition, we collect from multiple spots o the downconversion cone to further amplify the data rate, allowing usto achieve over 10 Mbits of secure key per second.

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