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.
 Julio T. Barreiro, et. al., Phys. Rev. Lett. 95, 26051 (2005).
 I. Ali-Khan, C. J. Broadbent, and J. C. Howell, Phys. Rev. Lett. 98,
 H.-K. Lo, H. F. Chau, and M. Ardehali, J. Cryptol. 18, 133 (2005).