Quantum entanglement is a well-established phenomenon in quantum mechanics, and its existence has been confirmed through numerous experimental observations. It is a fundamental aspect of quantum theory and has been tested and verified in a wide range of experiments. The predictions of quantum entanglement have been found to be in excellent agreement with experimental results.
One of the key aspects of quantum entanglement that has often been described as "spooky" is the idea of non-locality. When two particles are entangled, their states become correlated in a way that is independent of the physical distance between them. This means that measuring one particle can instantaneously affect the state of the other particle, even if they are separated by large distances. This seemingly instantaneous action at a distance is what Albert Einstein famously referred to as "spooky action at a distance."
This non-local correlation is puzzling because it appears to violate classical intuitions about cause and effect and the notion of local realism, which suggests that physical properties are determined locally and that information cannot travel faster than the speed of light. However, quantum mechanics allows for such non-local correlations, and numerous experiments have confirmed the predictions of quantum entanglement.
Quantum entanglement has been observed in various experiments, including tests of Bell's inequalities, which provide a way to experimentally determine whether a system exhibits non-local correlations. These experiments have consistently shown violations of Bell's inequalities, supporting the existence of entanglement.
While quantum entanglement may seem counterintuitive, it is a well-established and extensively studied phenomenon in quantum physics. Its implications have led to significant advances in fields such as quantum information processing, quantum cryptography, and quantum teleportation.