The quantum limit refers to the fundamental limit set by quantum mechanics on the precision or accuracy of measurements or other physical processes. In quantum mechanics, certain properties, such as position and momentum, cannot be measured with infinite accuracy simultaneously due to the inherent uncertainty principle. This limit has implications in fields such as quantum computing, quantum sensing, and quantum metrology, where researchers strive to reach the ultimate limits of precision allowed by the laws of quantum mechanics. By understanding and pushing the boundaries of the quantum limit, scientists can develop more advanced technologies and improve our understanding of the quantum world.