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Abstract: A qubit a spin-1-2 particle prepared in the up state is scattered by localspin-flipping potentials produced by the two target qubits two fixed spins,both prepared in the down state, to generate an entangled state in the latterwhen the former is found in the down state after scattering. The scatteringprocess is analyzed in three dimensions, both to lowest order and in full orderin perturbation, with an appropriate renormalization for the latter. Theentanglement is evaluated in terms of the concurrence as a function of theincident and scattering angles, the size of the incident wave packet, and thedetector resolution, to clarify the key elements for obtaining an entanglementwith high quality. The characteristics of the results are also discussed in thecontext of indistinguishability of alternative paths for a quantum particle.



Autor: Yuichiro Hida, Hiromichi Nakazato, Kazuya Yuasa, Yasser Omar

Fuente: https://arxiv.org/







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