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arXiv 0710.3259quant-ph
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具有雕塑噪声非高斯源的连续变量量子隐形传态

Continuous variable quantum teleportation with sculptured and noisy non-Gaussian resources

F. Dell'Anno, S. De Siena, L. Albano Farias, F. Illuminati

摘要:

我们研究了利用辐射场的相关类非高斯态作为纠缠源的连续变量量子隐形传态。首先,我们介绍了双模压缩对称叠加Fock态,包括双光束高斯态的有限截断作为特殊实现。这些状态依赖于一组自由的独立参数,可以调整的隐形传态协议的优化,与增强的成功概率的隐形传态的相干和Fock输入状态。我们发现,优化过程减少了纠缠资源截断双光束状态,从而代表了一类最佳的非高斯资源的量子隐形传态。然后,我们引入了另一类双模非高斯纠缠资源,压缩猫状态的形式。我们分析了优化(CV)隐形传态时的性能和性质,并将它们与以前的工作\cite{CVTelepNoi}中引入的优化压缩Bell态进行比较。我们讨论了如何最佳资源的隐形传态的特点是一个适当的平衡的纠缠内容和压缩真空亲和力。最后研究了热噪声对量子隐形传态效率的影响。为此,一个方便的框架是将噪声纠缠资源描述为非高斯态和热态的线性叠加。虽然热分量的存在大大降低了隐形传态的保真度,但与嘈杂的双光束高斯态相比,嘈杂的非高斯态仍然是首选资源。

英文摘要:

We investigate continuous variable (CV) quantum teleportation using relevant classes of non-Gaussian states of the radiation field as entangled resources. First, we introduce the class two-mode squeezed symmetric superposition of Fock states, including finite truncations of twin-beam Gaussian states as special realizations. These states depend on a set of free independent parameters that can be adjusted for the optimization of teleportation protocols, with an enhancement of the success probability of teleportation both for coherent and Fock input states. We show that the optimization procedure reduces the entangled resources to truncated twin beam states, which thus represents an optimal class of non-Gaussian resources for quantum teleportation. We then introduce a further class of two-mode non-Gaussian entangled resources, in the form of squeezed cat-like states. We analyze the performance and the properties of such states when optimized for (CV) teleportation, and compare them to the optimized squeezed Bell-like states introduced in a previous work \cite{CVTelepNoi}. We discuss how optimal resources for teleportation are characterized by a suitable balance of entanglement content and squeezed vacuum affinity. We finally investigate the effects of thermal noise on the efficiency of quantum teleportation. To this aim, a convenient framework is to describe noisy entangled resources as linear superpositions of non-Gaussian state and thermal states. Although the presence of the thermal component strongly reduces the teleportation fidelity, noisy non-Gaussian states remain preferred resources when compared to noisy twin-beam Gaussian states.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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