Sylvia Bratzik
Abstract:
Using the original repeater protocol [1] we calculate secret key rates and compare them for different distillation protocols (the Deutsch et al. protocol [2] and entanglement pumping [3]) and different distillation strategies (varying the number of distillation rounds in the nesting levels). The secret key rate is composed of the secret fraction and the repeater rate. In our analysis we derive formulas for the repeater rate which account for the classical communication time due to entanglement swapping and entanglement distillation. Depending on the type and value of the experimental imperfections, we show which distillation configuration leads to the optimal secret key rate.
[1] H.J. Briegel, W. Dür, J.I. Cirac, and P. Zoller, Phys. Rev. Lett. 81, 5932 (1998).
[2] D. Deutsch et al., Phys. Rev. Lett. 77, 2818 (1996).
[3] W. Dür, H.J. Briegel, J.I. Cirac, and P. Zoller, Phys. Rev. A 59, 169 (1999).