Key words
(English)
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Quantum entanglement; Bell nonlocality; Bell's theorem
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Research programs
(English)
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COST-Action MP1006 - Fundamental Problems in Quantum Physics
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Short description
(English)
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Quantum theory is our most accurate scientific theory. However, a century after its discovery, a deep and clear understanding of its foundations is still missing. The advent of quantum information offers a new perspective on this problem. Some of the most counter-intuitive quantum features (e.g. entanglement), once viewed as evidence of the failure of the theory, are now considered as its defining properties, and represent extremely powerful resources for information processing. Remarkably, entangled quantum particles can lead to nonlocal correlations. Long considered as two facets of the same phenomenon, entanglement and nonlocality turn out to be completely different concepts. Notably there exist nonlocal correlations more powerful than those of quantum theory which are still consistent with relativity. This raises many fundamental questions: Why is quantum nonlocality limited? Are there any physically implausible consequences of super-quantum models? Is there a physical principle from which quantum theory emerges? Answering these questions could potentially revolutionise our understanding of the foundations of quantum theory. The key challenges of this project are (1) to understand precisely the relation between entanglement and quantum nonlocality, (2) to characterize the nonlocal correlations of multipartite quantum systems, and (3) to find out why nonlocality is limited in quantum mechanics, identifying physical principles capturing the essence of quantum correlations
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Partners and International Organizations
(English)
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AT; BE; CZ; FI; FR; DE; EL; HU; IE; IL; IT; LV; LT; MT; PL; PT; RS; SK; SI; ES; SE; TR; UK; US; AU
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Abstract
(English)
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Quantum theory is our most accurate scientific theory. However, a century after its discovery, a deep and clear understanding of its foundations is still missing. The advent of quantum information offers a new perspective on this problem. Some of the most counter-intuitive quantum features (e.g. entanglement), once viewed as evidence of the failure of the theory, are now considered as its defining properties, and represent extremely powerful resources for information processing. Remarkably, entangled quantum particles can lead to nonlocal correlations. Long considered as representing two facets of the same phenomenon, entanglement and nonlocality turn out to be completely different concepts. Notably there exist nonlocal correlations more powerful than those of quantum theory which are still consistent with relativity. This raises many fundamental questions: Why is quantum nonlocality limited? Are there any physically implausible consequences of super-quantum models? Is there a physical principle from which quantum theory emerges? Answering these questions could potentially revolutionise our understanding of the foundations of quantum theory. The key challenges of this project are (1) to understand precisely the relation between entanglement and quantum nonlocality, (2) to characterize the nonlocal correlations of multipartite quantum systems, and (3) to find out why nonlocality is limited in quantum mechanics, identifying physical principles capturing the essence of quantum correlations.
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References in databases
(English)
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Swiss Database: COST-DB of the State Secretariat for Education and Research Hallwylstrasse 4 CH-3003 Berne, Switzerland Tel. +41 31 322 74 82 Swiss Project-Number: C13.0088
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