Classifying, quantifying, and witnessing qudit-qumode hybrid entanglement
Classifying, quantifying, and witnessing qudit-qumode hybrid entanglement
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DOI：
10.1103/physreva.85.032307
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发表时间：
2012-03-07
影响因子：
2.9
通讯作者：
van Loock, Peter
中科院分区：
文献类型：
--
作者：
Kreis, Karsten;van Loock, Peter
最近，出现了几种量子信息的混合方法，它们同时利用连续变量和离散变量的方法和资源。本文研究了有限维离散变量量子系统和无限维连续变量量子系统之间的二体混合纠缠。提出了一个分类方案，导致纯混合纠缠态，混合混合纠缠态（有效地支持一个整体的有限维希尔伯特空间），和所谓的真正的混合纠缠态（那些不能描述在一个整体的有限维希尔伯特空间）之间的区别。每个政权的状态的例子和纠缠见证以及量化进行了讨论。特别是，使用热光子噪声通道的通道图，我们发现真正的混合纠缠自然发生在物理上重要的设置。最后，扩展从二体到多体混合纠缠被认为是。
Recently, several hybrid approaches to quantum information emerged which utilize both continuous-and discrete-variable methods and resources at the same time. In this work, we investigate the bipartite hybrid entanglement between a finite-dimensional, discrete-variable quantum system and an infinite-dimensional, continuous-variable quantum system. A classification scheme is presented leading to a distinction between pure hybrid entangled states, mixed hybrid entangled states (those effectively supported by an overall finite-dimensional Hilbert space), and so-called truly hybrid entangled states (those which cannot be described in an overall finite-dimensional Hilbert space). Examples for states of each regime are given and entanglement witnessing as well as quantification are discussed. In particular, using the channel map of a thermal photon noise channel, we find that true hybrid entanglement naturally occurs in physically important settings. Finally, extensions from bipartite to multipartite hybrid entanglement are considered.