Nihilism was first founded by German philosopher Friedrich Nietzsche. Nietzsche characterized nihilism as emptying the world and especially human existence of meaning, purpose, comprehensible truth, or essential value. He hints that nihilism can become a false belief, when it leads individuals to discard any hope of meaning in the world and thus to invent some compensatory alternate measure of significance. If you are an atheist, you do not believe in God. You don't believe in god, meaning that you believe in no objective morality. If you are an atheist, you are a nihilist.
Quantum Nihilism was first formed be Chris Shea-Kurek in 2005. It is the combination of Quantum Physics and nihilism. Quantum Phyisics suggests that we are all one thing. We are all made of atoms that are made by something called quarks. According to quantum nihilism, we are all one thing. This one thing moves through an infinite amount of space at an infinite velocity, and it moves so fast that it actually interacts with itself. In the middle of all this chaos, there is an order and this order is what you percieve to be existence.