Abstract
Considering the ocean water’s optical attenuation is significantly larger than that of Fiber Channel, we propose an approach to enhance the security of underwater continuous-variable quantum key distribution (CVQKD). In particular, the photon subtraction operation is performed at the emitter to enhance quantum entanglement, thereby improving the underwater transmission performance of the CVQKD. Simulation results show that the photon subtraction operation can effectively improve the performance of CVQKD in terms of underwater transmission distance. We also compare the performance of the proposed protocol in different water qualities, which shows the advantage of our protocol against water deterioration. Therefore, we provide a suitable scheme for establishing secure communication between submarine and submarine vehicles.
Highlights
Quantum communication is a new type of communication method and quantum key distribution (QKD) [1,2,3,4] is part of it
We propose a novel method that uses photon subtraction operation [18,19,20] to improve the performance of underwater continuous-variable quantum key distribution (CVQKD) and extend its effective transmission distance
We find that the maximum transmission distance using one-photon subtraction operation can be 123.1 m for the one-photon subtraction-involved seawater CVQKD system
Summary
Quantum communication is a new type of communication method and quantum key distribution (QKD) [1,2,3,4] is part of it. The traditional way of underwater communication is to use underwater acoustic technology and its shortcomings are obvious, such as high extension, low bandwidth and security issues [5] To solve these problems, research has found that undersea optical communication can effectively improve communication bandwidth and reduce delay. We propose a novel method that uses photon subtraction operation [18,19,20] to improve the performance of underwater CVQKD and extend its effective transmission distance. This potentially allows one to establish the safest and largest underwater communication network [5].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
