We all know about the launching of a entanglement based communication satellite by China. But, once a Prof. of Quantum physics has told me that it's even "theoretically impossible" as it will be violation of the "law of casualty" as the two points get information ahead of the speed of light to connect the two point. I want to know the truth behind. On a recent newspaper article, I have seen that the Chinese authority has stated that the satellite has transmitted GB of data. I want to know whether it's possible or not as per the laws of quantum physics.