Quantum Cryptography. By Taipan Tamsare. Outline. Motivation Quantum Physics Polarization Quantum Cryptography Eavesdropping and Detection Current State Affairs Summary. Motivation. Why Quantum Cryptography? Nearly Impossible to steal Detect if someone is listening “Secure”.
Alice prepares 16 bits
in the following bases,
Thus the following states are sent to Bob:
Bob receives the stream of qubits and measures each one in a random basis:
So Bob gets
_ _ 0 _ _ 0 _ 0 _ 0_ 0 1 1 _ _
These bits will be the shared key they use for encryption.