China Launches World's First Quantum Communications Satellite

The mission will test quantum links—in principle unhackable—between space and the ground

2 min read
A view of QUESS at the Shanghai Engineering Center for Microsatellites in May
Deputy chief engineer Zhou Yilin (third from left) stands next to the quantum satellite at the Chinese Academy of Sciences' Shanghai Engineering Center for Microsatellites in May.
Photo: Cai Yang/Xinhua/Alamy

The first spacecraft designed to perform quantum communications was launched into space today, from the Jiuquan Satellite Launch Center at 1:40am local time.

The Chinese mission, dubbed Quantum Experiments at Space Scale (QUESS), is a milestone for researchers building the technology needed to create large-scale quantum communications networks. Thanks to the fundamental nature of quantum mechanics, which is sensitive to observation and prohibits the copying of unknown states, quantum links should in principle be unhackable. Gregoir Ribordy of the quantum cryptography firm ID Quantique told the Wall Street Journal that a quantum transmission is like a message scribbled on a soap bubble: “If someone tries to intercept it when it’s being transmitted, by touching it, they make it burst.”

Free of turbulent air (except for what you hit between Earth and orbit) and the distortions of fiber, space is an attractive place to pursue quantum communications. QUESS, which boasts the ability to generate pairs of entangled photons, will perform experiments in quantum entanglement and teleportation, Nature reports. But the first order of business will be quantum key distribution, “to establish a quantum key between Beijing and Vienna, using the satellite as a relay,” lead scientist Pan Jian-Wei told Nature in a Q&A published early this year.

Last year, Thomas Scheidl, a member of the Austrian Academy of Sciences team that is collaborating with Pan and his colleagues, explained to IEEE Spectrum how the process would work: 

 The satellite flies over a ground station in Europe and establishes a quantum link to the ground station, and you generate a key between the satellite and the ground station in Europe. Then, some hours later, the satellite will pass a ground station in China and establish a second quantum link and secure key with a ground station in China.

The satellite then has both keys available, and you can combine both keys into one key...Then you send, via a classical channel, the key combination to both of the ground stations. This you can do publicly because no one can learn anything from this combined key. Because one ground station has an individual key, it can undo this combined key and learn about the key of the other ground station.

With any luck, the two-year mission will be the first in a string of quantum communications spacecraft—and a progenitor of secure quantum communication for the masses. 

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Top Tech 2022: A Special Report

Preview two dozen exciting technical developments that are in the pipeline for the coming year

1 min read
Photo of the lower part of a rocket in an engineering bay.

NASA’s Space Launch System will carry Orion to the moon.

Frank Michaux/NASA

At the start of each year, IEEE Spectrum attempts to predict the future. It can be tricky, but we do our best, filling the January issue with a couple of dozen reports, short and long, about developments the editors expect to make news in the coming year.

This isn’t hard to do when the project has been in the works for a long time and is progressing on schedule—the coming first flight of NASA’s Space Launch System, for example. For other stories, we must go farther out on a limb. A case in point: the description of a hardware wallet for Bitcoin that the company formerly known as Square (which recently changed its name to Block) is developing but won’t officially comment on. One thing we can predict with confidence, though, is that Spectrum readers, familiar with the vicissitudes of technical development work, will understand if some of these projects don’t, in fact, pan out. That’s still okay.

Engineering, like life, is as much about the journey as the destination.

See all stories from our Top Tech 2022 Special Report

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