Erratum: Quantum walk on the line: Entanglement and non-local initial conditions [Phys. Rev. A73, 042302 (2006)]
Gonzalo Abal, R. Siri, A. Romanelli, R. Donangelo · Physical Review A · 2006
The sign in front of the integral expression for the coefficient b 3 in Eq. ͑A7͒ is not correct.This changes our conclusion that for the case of localized initial conditions the asymptotic entropy of entanglement S E is independent of the initial coin state, ͉͘ = cos ␣ ͉ R͘ + e i sin ␣ ͉ L͘.As shown in Fig. 1, S E takes values between 0.736. . .and 1 ͑full entanglement͒.The main conclusions of the paper, related to non-local initial conditions, are not affected by this mistake.