Noiseless Linear Amplifiers in Entanglement-Based Continuous-Variable Quantum Key Distribution

Abstract

We propose a method to improve the performance of two entanglement-based continuous-variable quantum key distribution protocols using noiseless linear amplifiers. The two entanglement-based schemes consist of an entanglement distribution protocol with an untrusted source and an entanglement swapping protocol with an untrusted relay. Simulation results show that the noiseless linear amplifiers can improve the performance of these two protocols, in terms of maximal transmission distances, when we consider small amounts of entanglement, as typical in realistic setups.

Advances in quantum cryptography

“…The use of NLAs in MDI-QKD setups was investigated in Ref. [440] while photon subtraction has been explored in Refs. [441,442].…”

EntangleNet: Theoretical Reestablishment of Entanglement in Quantum Networks †

“…The phenomenon of entanglement swapping for continuous variables is discussed in [16]. A quantum key distribution scheme involving entanglement swapping is proposed in [17], while a quantum conferencing scheme for secure communication between several users is developed in [18].…”

Security Analysis of Unidimensional Continuous-Variable Quantum Key Distribution Using Uncertainty Relations

“…This unconditional security is guaranteed by the basic principles of quantum mechanics. Continuous-variable quantum key distribution (CV-QKD) has attracted considerable attention over the past years because of its good performances in the secret key rates and compatibility with the current optical networks [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ]. A particular class of CV-QKD protocols that is based on the Gaussian modulation of coherent states has experienced a rapid development [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ].…”