China has made an historic discovery with a quantum experiment. It was previously known that two particles could communicate with each other instantly despite being far away from one another. In theory, two particles that are light years away could behave as if they were one and the same. This is a phenomenon known as quantum entanglement. Using this knowledge, Chinese researchers broke the previous record of 100 kilometers by producing a quantum entanglement of two particles separated by a distance of 1,200km! How did they do it?