There are some great explanation here, but I wanted to add an article that gave me some insight about the subject: http://arstechnica.com/science/2010/01/a-tale

There are some great explanation here, but I wanted to add an article that gave me some insight about the subject: http://arstechnica.com/science/2010/01/a-tale-of-two-qubits-how-quantum-computers-work/1/ http://arstechnica.com/science/2010/01/a-tale-of-two-qubits-...