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arXiv 1602.05074quant-ph
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多光子类W态的制备及其在量子隐形传态和超密集编码中的应用

Generating multi-photon W-like states for perfect quantum teleportation and superdense coding

Ke Li, Fan-Zhen Kong, Ming Yang, Fatih Ozaydin, Qing Yang, Zhuo-Liang Cao

摘要:

多体纠缠的一个有趣的方面是,对于完美的隐形传态和超密度编码,不需要最大纠缠的W态,而是需要一类特殊的非最大纠缠的类W态。因此,有效制备类W态在量子通信中具有重要意义,但这方面的研究还没有W态的制备那么多。在这封信中,我们提出了一个简单的光学方案,通过融合两个类W态或用辅助光子扩展类W态来有效地制备大尺度基于偏振的纠缠类W态。我们的方案还可以通过熔合或扩展W甚至类W态来产生大规模W态。代价分析表明,在产生大尺度W态时,非最大纠缠类W态的融合机制比最大纠缠W态的融合机制效率更高。我们的方案也可以与Bell态进行聚变或膨胀,它由一个偏振相关分束器、两个偏振分束器和光子探测器组成。不需要辅助光子或受控门操作,我们的方案可以实现与当前的光子技术,我们相信它使量子隐形传态和超密集编码在多体设置的进步。

英文摘要:

An interesting aspect of multipartite entanglement is that for perfect teleportation and superdense coding, not the maximally entangled W states but a special class of non-maximally entangled W-like states are required. Therefore, efficient preparation of such W-like states is of great importance in quantum communications, which has not been studied as much as the preparation of W states. In this letter, we propose a simple optical scheme for efficient preparation of large-scale polarization based entangled W-like states by fusing two W-like states or expanding a W-like state with an ancilla photon. Our scheme can also generate large-scale W states by fusing or expanding W or even W-like states. The cost analysis show that in generating large scale W states, the fusion mechanism achieves a higher efficiency with non-maximally entangled W-like states than maximally entangled W states. Our scheme can also start fusion or expansion with Bell states, and it is composed of a polarization dependent beam splitter, two polarizing beam splitters and photon detectors. Requiring no ancilla photons or controlled gates to operate, our scheme can be realized with the current photonics technology and we believe it enables advances in quantum teleportation and superdense coding in multipartite settings.

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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