2025-03-112025-03-112025-02-21Drmota, P., Main, D., Ainley, E., Agrawal, A., Araneda, G., Nadlinger, D.P.,...,Lucas, D.M. (2025). Experimental quantum advantage in the odd-cycle game. Physical Review Letters, 134, 070201. https://doi.org/10.1103/PhysRevLett.134.070201.0031-90071079-7114https://hdl.handle.net/11441/169899Wereport the first experimental demonstration of the odd-cycle game. We entangle two atoms separated by ∼2 m, and the players use them to win the odd-cycle game with a probability ∼26σ above that allowed by the best classical strategy. The experiment implements the optimal quantum strategy, is free of loopholes, and achieves 97.8(3)% of the theoretical limit to the quantum winning probability. We perform the associated Bell test and measure a nonlocal content of 0.54(2)—the largest value for physically separate devices, free of the detection loophole, ever observed.application/pdf6 p.engAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/Quantum advantageQuantum systemsOdd-cycle gameinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess10.1103/PhysRevLett.134.070201