Entanglement Transfer and C-Not Gate Implemented in A Fiber Connected 3-Atom System

Abstract

A robust scheme for unknown entangled state transfer and C-Not gate implemented between two spatially separated atoms is proposed. It is shown that, in the effective three-atom Ising model, two-atom unknown entangled state can be transferred from one pair of atoms to another deterministically by only repeating a simple operation of turning on/off local laser field applied on atom for two times at controlling time $\frac{\pi }{2{\Omega }_0}$. The whole time cost is less than $\frac{3\pi }{2{\Omega }_0}$. The successful probability and the fidelity are almost 100% for small atomic spontaneous emission rate. Deterministic two-atom C-Not gate can also be implemented in this model by just turning on/off the local laser field applied on the single target atom and leaving the controlling atom in its cavity alone for a while. The whole time cost is less than $\frac{\pi }{2{\Omega }_0}+\frac{3\pi \Delta }{2g^2}$. It is demonstrated that the scheme is insensitive to cavity leakage and fiber loss.

arXiv comment5 pages, 2 figures

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