Quantum entanglement allows particles to influence each other instantly across any distance.

Quantum entanglement was first discussed in a 1935 paper by Albert Einstein, Boris Podolsky, and Nathan Rosen, known as the EPR paradox. They argued that if quantum mechanics were complete, it would require particles to communicate faster than light, which Einstein believed was impossible. However, physicist John Bell developed 'Bell's Theorem' in 1964 to mathematically test if this instantaneous connection was actually happening.In 1982, researcher Alain Aspect conducted a groundbreaking experiment at the University of Paris-Sud. He used calcium atoms to produce pairs of entangled photons and measured their polarization. His results showed that the particles remained perfectly correlated even when separated by distances that light could not travel in the time the measurement took place.More recently, in 2015, researchers at Delft University of Technology performed a 'loophole-free' Bell test. They separated two electrons by 1.3 kilometers and found they were still linked. This confirmed that the connection is not limited by the speed of light, which is approximately 299,792 kilometers per second. While this allows for instant correlation, it is important to note that it cannot be used to send classical information faster than light because the outcome of the measurement is always random.