Modified BB84 Protocol Using CCD Technology

Quantum cryptography and especially quantum key distribution (QKD) is a technique that allocates secure keys only for a short distance. QKD protocols establish secure key by consent of both the sender and receiver. However, communication has to take place via an authenticate channel. Without this channel, QKD is vulnerable to man-in-the-middle attack. While not completely secure, it offers huge advantages over traditional methods by the use of entanglement swapping and quantum teleportation. In our research, we adopt the principle of charge-coupled device (CCD) to transfer the qubit from the sender to the receiver via a quantum channel. This technology has an added advantage over polarizer as only the circuit for transmitting the qubit is sufficient. No extra circuitry to implement the polarizer is required.