Fermions are local realistic

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Anicet Tibau


University of Oxford

January 28, 2021 3:15 PM


Since EPR and Bell, we associate quantum theory with non-locality. In this talk I present that this is not necessarily the case. I will go through the Deutsch-Hayden [1] formalism based on the Heisenberg picture to explain how quantum physics is a local-realistic theory at a structural level, and that all quantum phenomena has a local nature. The crucial point in this point of view is that the elements of reality are not described by numbers, rather with algebraic structures. Also, I will expose the main ideas and results from Raymond-Robichaud & Brassard [2] focussing on the theorem that states that any theory with reversible dynamics that follows the no-signalling theory is a local realistic theory (at a structural level). I will present these concepts in fermionic theory, where there is this halo of further non-locality in the system due to the -1 phase acquisition when two fermions are exchanged. I will explain the deduction of the fermionic descriptors and their relation to the Raymond-Robichaud formalism. If time allows for it I will present some brief examples in the fermionic context on how the descriptors allow one to give a completely local account of all quantum phenomena.  


[1] D. Deutsch and P. Hayden, Information flow in entangled systems, Proc. R. Soc. Lond. A 456(1999):1759-1774, 2000

[2] G. Brassard and P. Raymond-Robichaud, The equivalence of local-realistic and no-signalling theories, arXiv:1710.01380, 2017


Zoom meeting details 

Topic: Quantum Information and Quantum Computing Working Group
Time: January 28, 2021, 3:15 PM Warsaw
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Meeting ID: 96294497969
Passcode: 729533

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