1Univ. Grenoble Alpes, Inria, 38000 Grenoble, France
2Univ. Grenoble Alpes, CNRS, Grenoble INP, LIG, 38000 Grenoble, France
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Abstract
We investigate what quantum advantages can be obtained in multipartite non-cooperative games by studying how different types of quantum resources can lead to new Nash equilibria and improve social welfare — a measure of the quality of an equilibrium. Two different quantum settings are analysed: a first, in which players are given direct access to an entangled quantum state, and a second, which we introduce here, in which they are only given classical advice obtained from quantum devices. For a given game $G$, these two settings give rise to different equilibria characterised by the sets of equilibrium correlations $Q_textrm{corr}(G)$ and $Q(G)$, respectively. We show that $Q(G)subseteq Q_textrm{corr}(G)$, and by exploiting the self-testing property of some correlations, that the inclusion is strict for some games $G$. We make use of SDP optimisation techniques to study how these quantum resources can improve social welfare, obtaining upper and lower bounds on the social welfare reachable in each setting. We investigate, for several games involving conflicting interests, how the social welfare depends on the bias of the game and improve upon a separation that was previously obtained using pseudo-telepathic solutions.
![Improving social welfare in non-cooperative games with different types of quantum resources Improving social welfare in non-cooperative games with different types of quantum resources PlatoBlockchain Data Intelligence. Vertical Search. Ai.](https://platoblockchain.com/wp-content/uploads/2024/06/improving-social-welfare-in-non-cooperative-games-with-different-types-of-quantum-resources.jpg)
Featured image: The two quantum scenarios we consider. (a) “Quantum advice”: direct access to a shared quantum state. (b) “Quantum correlated advice”: classical access to a quantum correlation $C(s|r)$ via several local mediators sharing an entangled quantum state.
Popular summary
We study how quantum resources, such as entanglement, can help the players achieve Nash equilibria with better social welfare than using classical resources. We make a novel distinction between two different types of quantum resources: one in which the players have full control of a quantum device to perform measurements, and another in which they only have indirect, classical access to a quantum device they are provided with. Surprisingly, we find that this latter, classical access to quantum devices actually allows the players to reach more Nash equilibria. Numerical simulations indicate that some of these additional equilibria achieve higher social welfare for the players.
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► References
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This Paper is published in Quantum under the Creative Commons Attribution 4.0 International (CC BY 4.0) license. Copyright remains with the original copyright holders such as the authors or their institutions.
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