Quantum Go is a Go variant which provides a straightforward illustration of interesting quantum phenomena. Players no longer play single stones on the board but instead they take turns placing pairs of go stones which are called entangled. When one of the stones in an entangled pair is in direct contact with another stone, a phenomenon of quantum-like collapse occurs, where one of the stones in the pair is kept on the board and the other one is removed.
The aim of the game is still to surround more territory than the opponent. As the number of stones increases, all the entangled pairs of stones eventually reduce to single stones and Quantum Go closely resembles normal Go.
See Quantum Go for the rules of Quantum Go and example games.
There are several kinds of Quantum Go except the above.
Arne: Quantum Go
Lu-Feng Qiao: Quantum Go