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A discrete relativistic spacetime formalism for 1+1-QED with continuum limits

We build a quantum cellular automaton (QCA) which coincides with 1+1 QED on its known continuum limits. It consists in a circuit of unitary gates driving the evolution of particles on a one dimensional lattice, and having them interact with the gauge field on the links. The particles are massive fermions, and the evolution is exactly U(1) gauge-invariant. We show that, in the continuous-time discrete-space limit, the QCA converges to the Kogut-Susskind staggered version of 1+1 QED. We also show that, in the continuous spacetime limit and in the free one particle sector, it converges to the Dirac equation, a strong indication that the model remains accurate in the relativistic regime.

preprint2022arXivOpen access
Kevissen SellapillayPablo ArrighiGiuseppe Di Molfetta
quant-ph
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Kevissen SellapillayPablo ArrighiGiuseppe Di Molfetta

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