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December 20, 2020 11:10 pm

Winner Announced In the World's First 'Quantum Chess' Tournament

Aleksander Kubica is a postdoctoral fellow at Canada's Perimeter Institute for Theoretical Physics and Institute for Quantum Computing. And he's also the winner of the world's first quantum chess tournament. (It's now available for streaming on Twitch, and begins with a clip of the late Stephen Hawking playing a 2016 game against Ant-Man star Paul Rudd.) "It's a complicated version of regular chess that incorporates the quantum concepts of superposition, entanglement, and interference," explains Ars Technica (in an article shared by John Trumpian):In quantum chess, there are multiple boards on which the pieces exist, and their number is not fixed. Players can perform "quantum moves" as well as regular chess moves; players just need to indicate which type of move they're performing. Any quantum move will create a superposition of boards (doubling the number of possible boards in the superposition with each quantum move), although the player will see a single board representing all boards at the same time. And any individual move acts on all boards at the same time. Pawns move the same as in regular chess, but other pieces can make either standard moves or quantum moves, such that they can occupy more than one square simultaneously. In a 2016 blog post, Chris Cantwell of Quantum Realm Games offered the example of a white queen performing a quantum move from D1 to D3. "We get two possible boards. On one board the queen did not move at all. On the other, the queen did move. Each board has a 50 percent chance of 'existence'..." In 2016 Stephen Hawking had played a game of quantum chess against Paul Rudd in a video which also featured both Keanu Reeves and Alex Winter, stars of the "Bill and Ted" movies.

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