Quantum entanglement links particles from "summary" of A Breif History of Time and the Universe in a Nutshell by Stephen Hawking
Quantum mechanics is the branch of physics that deals with the behavior of very small particles, such as electrons and photons. One of the most fascinating phenomena in quantum mechanics is quantum entanglement, which occurs when two particles become connected in such a way that the state of one particle is instantly correlated with the state of the other, no matter how far apart they are. This means that if you measure the state of one particle, you can instantly know the state of the other, even if it is on the other side of the universe. The concept of quantum entanglement goes against our everyday intuition, which is based on classical physics, where objects are separate and have definite properties. In the quantum world, however, particles can exist in multiple states at once, a phenomenon known as superposition. When particles become entangled, their states are no longer independent of each other - they are interconnected in a way that defies classical logic. The implications of quantum entanglement are profound and have puzzled scientists for decades. Albert Einstein famously referred to it as "spooky action at a distance," as it seemed to violate the principle of locality, which states that objects can only influence each other if they are in close proximity. However, numerous experiments have confirmed the reality of quantum entanglement, leading to the development of quantum technologies such as quantum computing and quantum cryptography. One of the key features of quantum entanglement is that it is a non-local phenomenon, meaning that the correlations between entangled particles are not limited by the speed of light. This suggests that there is a deeper level of reality beyond our classical understanding, where particles can communicate instantaneously with each other, regardless of distance. In summary, quantum entanglement is a mysterious and fascinating aspect of quantum mechanics that challenges our classical notions of reality. It links particles in a way that defies traditional logic, opening up new possibilities for understanding the fundamental nature of the universe.
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