Satellites could prove the solution to providing global quantum communications

Ashley G. Smart

The satellite-based distribution of entangled photons to cities 1200 km apart bolsters prospects for a global quantum communication network.

Imran Khan

The security of our critical infrastructure is threatened by the advent of future quantum computers, breaking asymmetric cryptography – an essential part of our secure communication architecture. Quantum key distribution (QKD) remedies this weakness by providing a long term secure solution, safe against attacks from quantum computers. Satellites currently provide the only feasible way of connecting local metropolitan quantum networks over global distances. We present our work, performed in the Quantum Information Processing group in Erlangen, Germany and its planned spin-off company InfiniQuant towards developing an economically viable solution for a globally secure communication architecture.

Georgi Gary Rozenman, Alona Maslennikov, Sara P. Gandelman +5 more

Satellite-based quantum communications represent a critical advancement in the pursuit of secure, global-scale quantum networks. Leveraging the principles of quantum mechanics, these systems offer unparalleled security through Quantum Key Distribution (QKD) and other quantum communication protocols. This review provides a comprehensive overview of the current state of satellite-based quantum communications, focusing on the evolution from terrestrial to space-based systems. We explore the distinct advantages and challenges of discrete-variable (DV) and continuous-variable (CV) quantum communication technologies in the context of satellite deployments. The paper also discusses key milestones such as the successful implementation of quantum communication via the Micius satellite and outlines the primary challenges, including atmospheric turbulence and the development of quantum repeaters, that must be addressed to achieve a global quantum internet. This review aims to consolidate recent advancements in the field, providing insights and perspectives on the future directions and potential innovations that will drive the continued evolution of satellite-based quantum communications.

Thomas D. Jennewein, Brendon L. Higgins, Eric Choi

Yuan Wen Cao