A Secure Communication System for Free Space Utilizing Quantum Computing Based Multiple Bits Encryption and Decryption

In this research, an embedded system based quantum encryption and decryption using polarization scheme is proposed in the transmitter and receiver side .The information data andencryption code is fed into quantum encryption setup, where the encryption takes place and ispassed to the LED’s polarizer form where it is converted as photons and passed to the receiver. At the receiver end, LDR’s (light dependent resistor) are used, which act as a detector forconversion of light energy to optical energy. LDR output is decrypted using quantum decryptingand the original message is recovered. In the proposed system, the polarization state of photoncarries, quantum encryption key (private key if user). The property of photons is used in errordetection in the proposed system.The significant outcome of this research is that eaves dropping in quantumcommunication channel are always detected and the proposed system does not implementcomplex mathematical algorithms for its security. This research work is implemented in anembedded hardware for different transmission lengths for which encryption and decryption isperformed at a faster rate, when compared to implementation involving software simulationalone. The future enhancement of the above research would involve avoiding the usage ofquantum repeaters to achieve significant data transmission and reception.