Project description
Solving the mysteries of quantum entanglement
Quantum entanglement is a key element in quantum computing and information, but many questions about it remain unresolved. Most notably, we do not fully understand how to manipulate or detect mixed-state entanglement. There is also no clear theory explaining its role in thermodynamics or gravity. These gaps hinder progress in both fundamental physics and practical applications. The ERC-funded ETQO project aims to tackle these issues by exploring the generalised quantum Stein’s lemma (GQSL) and related questions. The project will work to solve key problems in the theory of entanglement, develop new tools to measure it, and investigate how entanglement can help in designing experiments to detect the quantumness of gravity. Through this, it will bridge the gap between quantum information theory and fundamental physics.
Objective
Quantum entanglement fuels the most important quantum information processing protocols and is central to modern physics. However, the most profound questions concerning its operational meaning remain unanswered. Most importantly, we do not know how efficiently mixed-state entanglement can be (i) manipulated or (ii) detected, (iii) whether it is possible to formulate a thermodynamical theory of entanglement revolving around a unique entropic measure, and finally (iv) how entanglement can be exploited to reveal quantum features of gravity in experiments with gravitationally interacting quantum systems. A single key statement connects all these questions, the Generalised Quantum Stein's Lemma (GQSL) from quantum hypothesis testing. I have however uncovered [Lami and Regula, Nature Physics 19, 184 (2023); BBGLPRT, Nature Physics, in press (2023)] a fatal flaw in the original proof of the GQSL, which is now regarded as one of the most important open problems in entanglement theory.
This project addresses questions (i)-(iv) in a unified way through the GQSL. The road map includes five key objectives. (O1) Solve the GQSL with techniques from quantum Shannon theory. (O2) Expand its scope from entanglement to other quantum resources and from states to processes. (O3) Design new entanglement measures and use them to obtain tight constraints on entanglement manipulation. (O4) Determine the ultimate performances of quantum communication networks, and characterise entanglement in many-body systems. Finally, (O5) investigate quantum gravitational experiments systematically with the formalism of quantum hypothesis testing, formulating a complete proposal of a new type of `dynamical' quantum gravitational experiment. Thanks to my strong track record in quantum information theory, entanglement theory, and their applications to fundamental physics problems, I am in an ideal position to complete this project, whose goal is to build new bridges connecting these three key areas.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
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- natural sciences physical sciences theoretical physics
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Keywords
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
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HORIZON.1.1 - European Research Council (ERC)
MAIN PROGRAMME
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Topic(s)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Funding Scheme
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
HORIZON-ERC - HORIZON ERC Grants
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Call for proposal
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
(opens in new window) ERC-2024-STG
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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.
56126 PISA
Italy
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.