QuantenNichtlokalität

QuantenNichtlokalität refers to a phenomenon in quantum mechanics where two or more quantum particles become linked in such a way that they share the same fate, regardless of the distance separating them. This connection is established through a process called entanglement. When particles are entangled, measuring a property of one particle instantaneously influences the corresponding property of the other, even if they are light-years apart.

This seemingly instantaneous influence defies classical intuition, which suggests that information cannot travel faster than the speed of light. Albert Einstein famously described this aspect of quantum mechanics as "spooky action at a distance" because it appeared to violate the principle of locality, which states that an object is influenced only by its immediate surroundings.

However, numerous experiments, starting with those inspired by Bell's theorem, have consistently confirmed the reality of quantum nonlocality. These experiments have ruled out local hidden variable theories, which attempted to explain quantum correlations through pre-determined properties that were not accessible to direct measurement.

While quantum nonlocality does not allow for faster-than-light communication (as the outcomes of measurements are still random and cannot be controlled to transmit information), it has profound implications for our understanding of the universe and forms the basis for emerging quantum technologies such as quantum computing and quantum cryptography. The non-classical correlations observed in entangled systems are a fundamental departure from the classical world and highlight the counter-intuitive nature of quantum reality.