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arXiv quant-ph/0609071quant-phcond-mat.stat-mechmath-phmath.MPphysics.optics
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光态工程、量子通信和三模高斯态纠缠混杂的鲁棒性

Optical state engineering, quantum communication, and robustness of entanglement promiscuity in three-mode Gaussian states

Gerardo Adesso, Alessio Serafini, Fabrizio Illuminati

摘要:

我们提出了一个新的,详细的研究的实用性的三模高斯态的连续变量量子信息的现实处理,特别强调的可能性开辟了他们真正的三方纠缠。我们描述了工程师的几个类的纯和混合的三模状态,突出其信息和/或纠缠特性的实用方案。特别是,我们介绍了一个简单的程序-基于无源光学元件-产生纯三模高斯态与{ \em任意}纠缠结构(在初始双模压缩态的可用性)。我们深入分析了分布式纠缠的性质及其共享结构的起源,表明纠缠共享的混杂性是对称高斯态所特有的一个特征,即使在存在显着程度的混合性和退相干的情况下也能生存。接下来,我们讨论了所考虑的三方纠缠态的适用性的实施量子信息和通信协议的连续变量。这将导致一个可行的实验建议,以测试混杂共享的连续变量三方纠缠,在最佳保真度的隐形传态网络与高斯资源。最后,我们专注于三模式状态的对称和非对称电信的应用程序,并挑选出最佳高斯资源的结构特性,后者在不同的设置协议。我们的分析旨在奠定基础,为实际的量子通信与连续变量超越二分方案。

英文摘要:

We present a novel, detailed study on the usefulness of three-mode Gaussian states states for realistic processing of continuous-variable quantum information, with a particular emphasis on the possibilities opened up by their genuine tripartite entanglement. We describe practical schemes to engineer several classes of pure and mixed three-mode states that stand out for their informational and/or entanglement properties. In particular, we introduce a simple procedure -- based on passive optical elements -- to produce pure three-mode Gaussian states with {\em arbitrary} entanglement structure (upon availability of an initial two-mode squeezed state). We analyze in depth the properties of distributed entanglement and the origin of its sharing structure, showing that the promiscuity of entanglement sharing is a feature peculiar to symmetric Gaussian states that survives even in the presence of significant degrees of mixedness and decoherence. Next, we discuss the suitability of the considered tripartite entangled states to the implementation of quantum information and communication protocols with continuous variables. This will lead to a feasible experimental proposal to test the promiscuous sharing of continuous-variable tripartite entanglement, in terms of the optimal fidelity of teleportation networks with Gaussian resources. We finally focus on the application of three-mode states to symmetric and asymmetric telecloning, and single out the structural properties of the optimal Gaussian resources for the latter protocol in different settings. Our analysis aims to lay the basis for a practical quantum communication with continuous variables beyond the bipartite scenario.

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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