UVA Virtual Lab simulations of Quantum Cellular Automata logic gates:
(Web Source: http://www.virlab.virginia.edu/VL/QCA_logic.htm)
Majority Gate: All three inputs get a vote, majority rules.
OR Gate: Anchor (fix) one input at 1. Then if either of two free inputs goes to 1, get 1 as output.
AND Gate: Anchor (fix) one input at 0. Then both of the free inputs must go to 1 in order to get 1 as output.
QCA's combined to form a binary adder (a basic building block that allows computers to do math)