Continuous variable quantum communication with 40 pairs of entangled sideband

TL;DR

This paper demonstrates an efficient method to extract and control 40 pairs of entangled sideband modes from squeezed light, advancing large-scale quantum communication capabilities.

Contribution

It introduces a novel scheme for extracting and stabilizing multiple entangled mode pairs using optical filtering and control technology, enabling large-capacity quantum communication.

Findings

Achieved a maximum entanglement level of 6.5 dB.

Successfully demonstrated quantum dense coding with these entangled modes.

Enhanced the scalability of quantum communication networks.

Abstract

Constructing large-scale quantum resources is an important foundation for further improving the efficiency and scalability of quantum communication. Here, we present an efficient extraction and stable control scheme of 40 pairs of entangled sideband modes from the squeezed light by specially designing optical parametric oscillator. Utilizing the low-loss optical frequency comb control technology and the local cross-correlation algorithm, we model and manage the efficient separation process of the entangled sidebands modes facilitated by the optical filtering cavities, a maximum entanglement level of 6.5 dB is achieved. The feasibility of large-capacity quantum dense coding based on these entangled sideband modes is proved experimentally, which is of great significance for optimizing the utilization of quantum resources, thereby contributing to the advancement of large-capacity quantum communication networks and enabling the realization of more secure and efficient quantum communication systems.