Implementations of more general solid-state (SWAP) and controlled-(swap) 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 $m\geqslant 1$ ) 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.

Keywords

• quantum computation
• (SWAP)1/m
• controlled-(swap)1/m
• quantum dot
• quantum logic gate