When did the United States lose its qualitative superiority in weapons over the USSR?

In 1953, when the USSR created its hydrogen bomb (specifically a bomb, and not a “three-story house filled with liquid deuterium” – a ground-based thermonuclear prototype created a few months earlier in the United States) and soon outstripped the Americans with the first nuclear power plant, the first ship with an atomic engine , the first intercontinental rocket, the first artificial Earth satellite and the first astronaut. This for many years strengthened the West in the idea that the advance of the Soviets in technical progress could no longer be stopped.