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A quantum lock was something capable of separating a certain area of space from entangling with the rest of space-time. This kept events in the contained area from tearing apart space around the affected area.
In 2382, Juel Ducane and Jena Noi established a quantum lock around the third moon of Rakon IV in order to stop the battle between various Temporal Cold War factions from tearing apart space-time. (DTI novel: Watching the Clock)