Performance Analysis of Continuous Variable Quantum Teleportation with Noiseless Linear Amplifier in Seawater Channel

Abstract

Continuous variable quantum teleportation (CVQT) is one of the technologies currently explored to implement global quantum networks. Entanglement source is an indispensable resource to realize CVQT, and its distribution process has natural symmetry. Though there are many results for CVQT over optical fiber or atmospheric channel, little attention is paid to seawater channel. In this paper, a model based on seawater chlorophyll concentration is used to study the attenuation effect of seawater on light. In our scheme, a noiseless linear amplifier is utilized for enhancing the performance of CVQT under seawater channel. Simulation results show that the proposed scheme has an improvement in terms of fidelity and maximum transmission distance compared with the original scheme.

Non-Gaussian approach: Withstanding loss and noise of multi-scattering underwater channel for continuous-variable quantum teleportation

“…This paper presents an extension of prior research [23] by introducing a novel multi-scattering random channel model for underwater CVQT links. The proposed model employs MC simulation method and integrates the chlorophyll concentration model to effectively capture the spatialtemporal behavior of the channel.…”

Free-Space Quantum Teleportation with Orbital Angular Momentum Multiplexed Continuous Variable Entanglement

“…However, most of the current research has focused on improving the fidelity of the teleported quantum state and increasing the scale of communication distance. Typically, non-Gaussian entangled sources, arising from operations such as photon addition and subtraction [12,13], photon catalysis [14], and noiseless quantum amplification [15][16][17][18], were used in CVQT protocols to improve system fidelity. Otherwise, non-traditional coherent state sources such as discrete variable sources [19,20], spin coherent states [21], and thermal states [22] were also employed to achieve this goal.…”

“…On this basis, Wen et al proposed to further increase the secure communication distance while improving the system fidelity with methods such as photon catalysis and noiseless linear amplification [14,15]. Similarly, Wu and Xu et al proposed that the fidelity and transmission distance of CVQT systems in underwater and turbulent atmospheric channels can be improved using noiseless linear amplifier, respectively [17,18]. Furthermore, Zuo et al theoretically demonstrated the realisability of the CVQT protocol in a ground-to-satellite uplink, thereby extending the transmission distance to the hundreds of kilometres scale [24].…”