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Implementations of more general solid-state (SWAP)$^{1/m}$ and controlled-(swap)$^{1/m}$ gates (2001.03428v1)
Published 10 Jan 2020 in quant-ph
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 $m\geq1$) 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.