Figure 1

Quantum secured system for ultra-high data bandwidth encryption.

A high speed quantum key distribution (QKD) system is combined with a high speed classical data encryptor (HSE). Details of the QKD system can be found in ref. 14 and the working principle of the HSE can be found in ref. 15. The multiple wavelengths from the HSE are wavelength multiplexed using a dense wavelength division multiplexer (DWDM) before multiplexing with the quantum signals using a coarse wavelength division multiplexer (CWDM). Quantum signals on the receiver side are spectrally filtered using either a 100 GHz or 25 GHz spectral filter. Quantum keys generated by the QKD system are pushed symmetrically over Ethernet to the respective HSE’s. The quantum keys are used to encrypt the 2 × 100 Gb/s data traffic using the AES algorithm in real time.