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arXiv:1503.01242

Quantum state transfer between three ring-connected atoms

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

Published Mar 4, 2015• 0 citations
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Abstract

A robust quantum state transfer scheme is discussed for three atoms that are trapped by separated cavities linked via optical fibers in ring-connection. It is shown that, under the effective three-atom Ising model, arbitrary quantum state can be transferred from one atom to another deterministically via an auxiliary atom with maximum unit fidelity. The only required operation for this scheme is replicating turning on/off the local laser fields applied to the atoms for two steps with time cost $\frac{\sqrt{2}π}{Γ_{0}}$. The scheme is insensitive to cavity leakage and atomic position due to the condition $Δ\approx κ\gg g$. Another advantage of this scheme is that the cooperative influence of spontaneous emission and operating time error can reduce the time cost for maximum fidelity and thus speed up the implementation of quantum state transfer.

DOI
10.48550/arxiv.1503.01242

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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 p2/O0. The whole time cost is less than 3p2/O0. 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 p2/O0+3p?2/g2. It is demonstrated that the scheme is insensitive to cavity leakage and fiber loss.
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