Micius, the World’s First Quantum Communication Satellite, Has Left the Sky
Table of Contents
27 Jan 2026 — China’s Micius satellite (墨子号), the world’s first quantum communication satellite, has reentered Earth’s atmosphere, according to tracking data from N2YO showing the spacecraft’s status as decayed as of late January 2026.
The ~635 kg satellite had orbited at approximately 500 km altitude in a sun-synchronous orbit since its launch on August 16, 2016 from the Jiuquan Satellite Launch Center. Designed for a two-year mission, it operated for nearly a decade – far exceeding its intended lifespan. The reentry is consistent with heightened atmospheric drag from the current Solar Cycle 25 solar maximum, which has accelerated orbital decay for multiple low-Earth orbit spacecraft.
No official statement from the Chinese Academy of Sciences (CAS) has been issued at the time of writing. (As far as I was able to find.)
What Micius Achieved
It is difficult to overstate what this single satellite accomplished. Named after the ancient Chinese philosopher Mozi – who discovered that light travels in straight lines and was likely the first person to record a pinhole image – Micius became the defining platform for space-based quantum communication.
In 2017 alone, the satellite produced three landmark papers that fundamentally demonstrated space-based quantum communication was possible. Liao et al. in Nature reported the first satellite-to-ground decoy-state QKD, generating approximately 300 kilobits of secure key during a single 273-second pass — a channel efficiency roughly 20 orders of magnitude better than equivalent fiber at the same 1,200 km distance. Yin et al. in Science demonstrated entanglement distribution over 1,200 km to ground stations in Delingha and Lijiang, violating Bell’s inequality under strict Einstein locality conditions and winning the AAAS Newcomb Cleveland Prize. Ren et al. in Nature achieved the first ground-to-satellite quantum teleportation over up to 1,400 km.
In January 2018, Micius facilitated the first intercontinental quantum-secured video conference — a 75-minute call between CAS president Bai Chunli in Beijing and Anton Zeilinger in Vienna, secured by satellite-relayed QKD across 7,600 km. In 2020, it demonstrated entanglement-based QKD over 1,120 km without requiring a trusted relay — a proof-of-concept that eliminated the most significant security assumption in satellite QKD. It was even used for a China-Russia QKD link spanning 3,800 km between Moscow and Ürümqi.
A Monument, Not a Setback
Micius reentering the atmosphere is not a loss for China’s quantum communications program — it is a monument to how far the field has moved beyond it.
The satellite had already been operationally superseded. The Jinan-1 microsatellite, launched in 2022, weighs roughly one-sixth as much, uses ground stations 130 times lighter, and generates keys two to three orders of magnitude faster. In March 2025, Jinan-1 established a 12,900 km intercontinental QKD link between Beijing and Stellenbosch, South Africa — the first between the Northern and Southern Hemispheres. Pan Jianwei has announced plans for additional LEO quantum satellites launching in 2025, a medium-Earth orbit satellite by 2027, and a geostationary orbit satellite called “Dawn” that would enable daytime QKD with continuous communication windows.
Meanwhile, China’s ground-based quantum network has scaled to over 12,000 km of carrier-grade QKD-secured fiber across 17 provinces, serving 6.8 million users through China Telecom Quantum. The satellite segment is now one component of a much larger integrated infrastructure, not the centerpiece.
There is a temptation to draw a Sputnik analogy in reverse — to treat Micius’s reentry as a symbolic ending. That would miss the point. Sputnik proved something was possible. Micius proved space-based quantum communication was possible, and then China built an entire operational ecosystem on top of what it learned. As I have covered in my analysis of China’s quantum networking dominance, no other nation has anything comparable — and the gap is widening, not closing.
Micius earned its retirement. The work it started is now infrastructure.
Quantum Upside & Quantum Risk - Handled
My company - Applied Quantum - helps governments, enterprises, and investors prepare for both the upside and the risk of quantum technologies. We deliver concise board and investor briefings; demystify quantum computing, sensing, and communications; craft national and corporate strategies to capture advantage; and turn plans into delivery. We help you mitigate the quantum risk by executing crypto‑inventory, crypto‑agility implementation, PQC migration, and broader defenses against the quantum threat. We run vendor due diligence, proof‑of‑value pilots, standards and policy alignment, workforce training, and procurement support, then oversee implementation across your organization. Contact me if you want help.
