QUANTUM CRYPTOGRAPHY NETWORK

Problem:

Existing fiber based and free space optical links have limited range due to the transmission losses. Transmission losses inside an optical fiber limits the maximum achievable quantum key distribution range to hundred(s) of kilometers. Free space optical links have direct line-of-sight access problem due the shape of the Earth, which requires elevated nodes. Even with the elevated nodes there is a range limitation due to the losses within the atmosphere. Satellites are exploited in order to extend the QKD range. In this case the optical ground stations act as a trusted quantum nodes and still requires further improvement in order to provide the key to specific locations on Earth where there is no optical ground station. 

Technology:

The invention relates generally to the quantum cryptographic systems and more specifically to the extension of distances to quantum key delivery in order to establish a quantum communication network. 

Advantages:

Invention provides solution to:

•Limited free space and fiber based optical link range

•Line-of-sight access for free-space optical links

•Secure transfer of quantum keys to distant targets that are out of link range.

The ease of implementation of the idea of courier drone makes this invention 

a suitable candidate for establishing a quantum cryptography network. The 

use of extra keys for secure transfer of a key to distant location benefit from 

the fact that if the pre-shared secret key is:

i. Random

ii. Safe (private)

Related Publications:

http://labs.ozyegin.edu.tr/qoptics/

TRL 5-6