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Abstract: We investigate whether a two-qubit quantum gate can be implemented in ascattering process involving a flying and a static qubit. To this end, we focuson a paradigmatic setup made out of a mobile particle and a quantum impurity,whose respective spin degrees of freedom couple to each other during aone-dimensional scattering process. Once a condition for the occurrence ofquantum gates is derived in terms of spin-dependent transmission coefficients,we show that this can be actually fulfilled through the insertion of anadditional narrow potential barrier. An interesting observation is that underresonance conditions the above enables a gate only for isotropic Heisenbergexchange interactions and fails for an XY interaction. We show the existenceof parameter regimes for which gates able to establish a maximum amount ofentanglement can be implemented. The gates are found to be robust to variationsof the optimal parameters.



Author: G. Cordourier-Maruri, F. Ciccarello, Y. Omar, M. Zarcone, R. de Coss, S. Bose

Source: https://arxiv.org/







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