The power of a quantum computer is limited by how long it can remain in a certain state, and high-energy particles hurtling from space can destroy those quantum states
Source:
https://www.newscientist.com/article/2252933-quantum-computers-may-be-destroyed-by-high-energy-particles-from-space/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home