## Imaginary numbers in Quantum mechanics?

Well most of us have heard that you cannot take the square root of $-1$, however, you can easily define a new number, called $i$, to be just that. In equations, $i=\sqrt{-1}$. Seems like fun, but what does it mean for the real world? Well, everything, almost. Remember the discussion about superpositions? There we said […]

## A superposition

At the heart of quantum mechanics is the super awesome superposition. Pretty much all of the weirdness of quantum mechanics is due to superpositions. Ever heard of Schrödingers cat? When we speak of objects, we generally classify them by their possible states. for example, a cat is either dead or alive, $|\textrm{dead}\rangle$ or $|textrm{alive}\rangle$. A […]