Hi all My question: One of the four Bell's state are measuring in the Bell basis. Whether the result of measurement of this one of the four Bell's state will be the same Bell's state (just that Bell's state which are measuring) ? The each of four Bell's state is a quantum superposition of the two entangled qubits. Whether the result of measurement in the case of Bell basis will be superposition as well ? Whether there will not be collapse of the superposition ?