Experimental Eavesdropping Based on Optimal Quantum Cloning
Experimental Eavesdropping Based on Optimal Quantum Cloning
The security of quantum cryptography is guaranteed by the no-cloning theorem, which implies that an eavesdropper copying transmitted qubits in unknown states causes their disturbance. Nevertheless, in real cryptographic systems some level of disturbance has to be allowed to cover, e.g., transmission losses. An eavesdropper can attack such systems by …