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Journal Article
An integrated space-to-ground quantum communication network over 4,600 kilometres
2021
Overview
Quantum key distribution (QKD)
1
,
2
has the potential to enable secure communication and information transfer
3
. In the laboratory, the feasibility of point-to-point QKD is evident from the early proof-of-concept demonstration in the laboratory over 32 centimetres
4
; this distance was later extended to the 100-kilometre scale
5
,
6
with decoy-state QKD and more recently to the 500-kilometre scale
7
–
10
with measurement-device-independent QKD. Several small-scale QKD networks have also been tested outside the laboratory
11
–
14
. However, a global QKD network requires a practically (not just theoretically) secure and reliable QKD network that can be used by a large number of users distributed over a wide area
15
. Quantum repeaters
16
,
17
could in principle provide a viable option for such a global network, but they cannot be deployed using current technology
18
. Here we demonstrate an integrated space-to-ground quantum communication network that combines a large-scale fibre network of more than 700 fibre QKD links and two high-speed satellite-to-ground free-space QKD links. Using a trusted relay structure, the fibre network on the ground covers more than 2,000 kilometres, provides practical security against the imperfections of realistic devices, and maintains long-term reliability and stability. The satellite-to-ground QKD achieves an average secret-key rate of 47.8 kilobits per second for a typical satellite pass—more than 40 times higher than achieved previously. Moreover, its channel loss is comparable to that between a geostationary satellite and the ground, making the construction of more versatile and ultralong quantum links via geosynchronous satellites feasible. Finally, by integrating the fibre and free-space QKD links, the QKD network is extended to a remote node more than 2,600 kilometres away, enabling any user in the network to communicate with any other, up to a total distance of 4,600 kilometres.
A quantum network that combines 700 fibre and two ground-to-satellite links achieves quantum key distribution between more than 150 users over a combined distance of 4,600 kilometres.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
