Quantifying quantum coherence

One of the weirdness of quantum physics is the so called Superposition Principle, that can be explained in a just a few words at the fact that a quantum mechanical object can be in two states at the same time. Taking the qubit as an analogy, if we think of the classical computational bit of either being 0 or 1, the quantum mechanical counterpart will be a bit able to be 0, 1, or 0 and 1 at the same time. Researchers are now trying to measure how much superposition or coherence, as well as how useful that can be, in a system. A step forward for a better understanding of the quantum world for future practical applications.