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Nonlocality in quantum groups

Project description

Probing non-local graph symmetries

Funded by the Marie Skłodowska-Curie Actions programme, the NONLOCQUANT project will conduct research on quantum automorphism groups of graphs and probe their connection to isomorphism games. The project will investigate physical observables in quantum behaviours, prove self-testing theorems and foster links between quantum groups and quantum information. A key topic addressed will be the non-local symmetries of graphs – quantum symmetries of graphs arising from non-classical quantum strategies of the corresponding isomorphism game. Recent results in quantum information theory will be leveraged to address open questions in quantum groups.

Objective

This project focuses on quantum automorphism groups of graphs and their connection to isomorphism games. We will investigate physically observable quantum behaviours, prove self-testing theorems and foster a two-way exchange between quantum groups and quantum information. The latter connection relies on quantum isomorphisms of graphs, which are defined as perfect quantum strategies of isomorphism games. Quantum isomorphisms from a graph to itself have been shown to be equivalent to quantum automorphisms, in the setting of quantum automorphism groups. One of the main questions that the project aims to understand are nonlocal symmetries of graphs. Those are quantum symmetries of graphs coming from non-classical quantum strategies of the corresponding isomorphism game. Interestingly, there are graphs that have quantum symmetry, but all quantum strategies are equivalent to classical ones. Thus, there is a difference between the considered model of reality and our observations of reality. Understanding this phenomenon will enable us to provide new examples of pairs of quantum isomorphic, non-isomorphic graphs. Another objective is to obtain self-testing theorems for isomorphism games. In the language of nonlocal games, self-testing means that any near perfect strategy is close to some fixed reference strategy. Self-testing theorems of linear binary constraint systems will be studied to transfer them to the isomorphism game setting. The project aims also to use recent results in quantum information theory for addressing open questions in quantum groups. On the one hand, giving examples of quantum automorphism groups of graphs that are not residually finite dimensional. On the other hand, figuring out the complexity of computing quantum symmetry and nonlocal symmetry.

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Topic(s)

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MSCA-IF - Marie Skłodowska-Curie Individual Fellowships (IF)

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Call for proposal

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(opens in new window) H2020-MSCA-IF-2020

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Coordinator

KOBENHAVNS UNIVERSITET
Net EU contribution

Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.

€ 207 312,00
Address
NORREGADE 10
1165 KOBENHAVN
Denmark

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Region
Danmark Hovedstaden Byen København
Activity type
Higher or Secondary Education Establishments
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Total cost

The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.

€ 207 312,00
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