Implementations of more general solid-state (SWAP)${}^{1/m}$ and controlled-(swap)${}^{1/m}$ gates

Abstract

Universal quantum gates are the core elements in quantum information processing. We design two schemes to realize more general (SWAP)${}^{1/m}$ and controlled--(swap)${}^{1/m}$ gates (for integer $m\ge 1$) by directing flying single photons to solid--state quantum dots. The parameter $m$ is easily controlled by adjusting two quarter--wave plates and one half--wave plate. Additional computational qubits are not required to construct the two gates. Evaluations of the gates indicate that our proposals are feasible with current experimental technology.

arXiv comment20 page,7 figures

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