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quant-ph2026
Tangent fermions can restore vacuum stability of discrete-time Dirac models
C. W. J. Beenakker
The Dirac quantum walk (a 1+1 dimensional space-time discretization of the Dirac equation) has a mass gap both at the center and at the corner of the quasi-energy-momentum Bri…
quant-ph2026
Quantum circuit decomposition of the tangent-fermion Dirac operator
C. W. J. Beenakker
The Dirac operator on a lattice cannot be both local and free of fermion doubling, at least not without breaking fundamental symmetries. Non-local, symmetry-preserving discretizati…