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arXiv:1503.01310

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

Yao Deng, Yan-Qing, Guo, Pei Pei, Dianfu Wang, Mi Dong

Published Mar 4, 2015• 0 citations
arXivHTMLPDF

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 $\fracπ{2Ω_{0}}$. The whole time cost is less than $\frac{3π}{2Ω_{0}}$. 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 $\fracπ{2Ω_{0}}+\frac{3πΔ}{2g^{2}}$. It is demonstrated that the scheme is insensitive to cavity leakage and fiber loss.

DOI
10.48550/arxiv.1503.01310

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Implementation of a quantum swap\sqrt{\rm_{swap}}swap​​ gate for two distant atoms trapped in separate cavities
The generation of atomic entanglement is discussed in a system that atoms are trapped in separate cavities which are connected via optical fibres. Two distant atoms can be projected to Bell-state by synchronized turning off of the local laser fields and then performing a single quantum measurement by a distant controller. The distinct advantage of this scheme is that it works in a regime where Δ ≈ κ ≫ g, which makes the scheme insensitive to cavity strong leakage. Moreover, the fidelity is not affected by atomic spontaneous emission.