Twin-Field Quantum Key Distribution Protocol Based on Wavelength-Division-Multiplexing Technology

Abstract

Quantum key distribution (QKD) generates information-theoretical secret keys between two parties based on the physical laws of quantum mechanics. With the development of quantum communication network, it is feasible and economical to combine QKD with classical optical communication through the same fiber by using dense wavelength division multiplexing (DWDM) technology. In this paper, a detail scheme of TF-QKD protocol with DWDM technology is proposed and the performance is analyzed, which takes the influence of quantum channel number and adjacent quantum crosstalk on the secret key rates into considering. The simulation results show that the scheme further increases the secret key rate of TF-QKD and its variants. Therefore, this scheme provides a method to improve the secret key rate for practical quantum networks.

Research progress in quantum key distribution

“…[60] In the same year, researchers from Beijing University of Posts and Telecommunications proposed TF-QKD based on wavelength-division-multiplexing technology, which further increased the secret key rate of TF-QKD and its variants. [61] In 2023, researchers from Nanjing University proposed a twophoton TF-QKD protocol that eliminates the strict constraints on intensity and probability, [62] in the same year, researchers from the University of Science and Technology of China achieved 100 km TF-QKD. [63] TF-QKD is a very promising field that offers new possibilities for ultra-long-distance quantum secure communication.…”

Compact generation scheme of path–frequency hyperentangled photons using 2D periodical nonlinear photonic crystal

“…By exploiting multiple degrees of freedom, hyperentanglement allows for more efficient transmission of information and increases resistance to noise. [19] Such advancements pave the way for significant applications in secure quantum key distribution, [20,21] quantum teleportation, [22] and quantum cryptography. [23,24] The generation of hyperentangled photon pairs through the spontaneous parametric down-conversion (SPDC) process in nonlinear photonic crystals (NPC) [25][26][27][28] with second-order susceptibility χ (2) is widely employed in research.…”

Joint Authentication Public Network Cryptographic Key Distribution Protocol Based on Single Exposure Compressive Ghost Imaging

“…However, the longer the CK, the more timeconsuming the encryption and decryption processes become. In addition to the above algorithm-based schemes, there are several other CKD protocols [such as quantum key distribution (QKD) [9][10][11][12] and CKDs based on optical channel physical features [13,14] ] that exploit physical properties. The former uses quantum mechanical properties to ensure communication security, but its equipment is too expensive, its key generation rate is limited, the security of the signal is affected by the transmission length, and it is difficult to achieve simultaneous CKD to multiple parties.…”