Entanglement quantification from incomplete measurements: applications using photon-number-resolving weak homodyne detectors
Entanglement quantification from incomplete measurements: applications using photon-number-resolving weak homodyne detectors
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DOI：
10.1088/1367-2630/12/3/033042
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发表时间：
2009-11
影响因子：
3.3
通讯作者：
G. Puentes;A. Datta;Á. Feito;J. Eisert;M. Plenio;I. Walmsley
中科院分区：
文献类型：
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作者：
G. Puentes;A. Datta;Á. Feito;J. Eisert;M. Plenio;I. Walmsley
一些重要的量子信息处理协议（如纠缠蒸馏）的成功证书是基于协议前后系统量子态纠缠含量的差异。在这种情况下，有效的界限需要放置在纠缠的非本地状态从本地测量获得的统计一致。在本文中，我们数值研究的能力相结合的相位灵敏度和光子数分辨率的混合零差检测器设置准确的界限上的纠缠内容的双模正交压缩态，而不需要全状态层析成像。我们表明，它是可能的设置严格的下限上的一个家庭的双模消磁态的纠缠只使用几个测量。这对连续变量纠缠蒸馏的实验演示的资源要求提出了显着的改进，该实验演示传统上依赖于全量子态层析成像。
The certificate of success for a number of important quantum information processing protocols, such as entanglement distillation, is based on the difference in the entanglement content of the system quantum states before and after the protocol. In such cases, effective bounds need to be placed on the entanglement of non-local states consistent with statistics obtained from local measurements. In this paper, we study numerically the ability of a hybrid homodyne detector that combines phase sensitivity and photon-number resolution to set accurate bounds on the entanglement content of two-mode quadrature squeezed states without the need for full state tomography. We show that it is possible to set tight lower bounds on the entanglement of a family of two-mode degaussified states using only a few measurements. This presents a significant improvement over the resource requirements for the experimental demonstration of continuous-variable entanglement distillation, which traditionally relies on full quantum state tomography.