Multiatom and resonant interaction scheme for quantum state transfer and logical gates between two remote cavities via an optical fiber

摘要

A system consisting of two single-mode cavities spatially separated andconnected by an optical fiber and multiple two-level atoms trapped in thecavities is considered. If the atoms resonantly and collectively interact withthe local cavity fields but there is no direct interaction between the atoms,we show that an ideal quantum state transfer and highly reliable quantum swap,entangling, and controlled-Z gates can be deterministically realized betweenthe distant cavities. We find that the operation of state transfer and swap,entangling, and controlled-Z gates can be greatly speeded up as number of theatoms in the cavities increases. We also notice that the effects of spontaneousemission of atoms and photon leakage out of cavity on the quantum processes canalso be greatly diminished in the multiatom case.