On the security of fiber optic quantum cryptography systems without the control of the intensity of quasi-single-photon coherent states
S. N. Molotkov · Journal of Experimental and Theoretical Physics Letters · 2015
Internal losses in systems of quantum cryptography can be used at attacks by an eavesdropper. As a result, the security of keys cannot be ensured for a number of protocols. This problem can be solved by using geometrically uniform coherent states with a larger number of bases. The security of keys at the number of bases N b /2 = 4 and the number of states N b = 8 can be guaranteed even without the control of the intensity of input states.