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- W3035502269 abstract "It has been shown that certain quantum walks give rise to relativistic wave equations, such as the Dirac and Weyl equations, in their long-wavelength limits. This intriguing result raises the question of whether something similar can happen in the multi-particle case. We construct a one-dimensional quantum cellular automaton (QCA) model which matches the quantum walk in the single particle case, and which approaches the quantum field theory of free fermions in the long-wavelength limit. However, we show that this class of constructions does not generalize to higher spatial dimensions in any straightforward way, and that no construction with similar properties is possible in two or more spatial dimensions. This rules out the most common approaches based on QCAs. We suggest possible methods to overcome this barrier while retaining locality." @default.
- W3035502269 created "2020-06-19" @default.
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- W3035502269 creator A5061373590 @default.
- W3035502269 date "2020-10-12" @default.
- W3035502269 modified "2023-10-18" @default.
- W3035502269 title "Quantum field theory from a quantum cellular automaton in one spatial dimension and a no-go theorem in higher dimensions" @default.
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- W3035502269 doi "https://doi.org/10.1103/physreva.102.042211" @default.
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