Heisenberg's uncertainty principle
However, it is now clear that the uncertainty principle is a property of all wave-like systems. It arises in quantum mechanics simply due to the matter wave nature of all quantum objects. Thus, the uncertainty principle actually states a fundamental property of quantum systems, and is not a statement about the observational success of current technology. "Measurement" does not mean just a process in which a physicist-observer takes part, but rather <u/l>any interaction between classical and quantum objects regardless of any observer</u/l>.