存储在晶体中的多维纠缠的量化
Quantification of multidimensional entanglement stored in a crystal
摘要：
多维纠缠的使用为量子信息处理开辟了新的前景。然而，在实践中的一个重要挑战是证明和表征多维纠缠的测量数据通常是有限的。在这里，我们报告的认证和量化的多个时间模式之间的双光子多维能量-时间纠缠，一个光子已被存储在一个晶体。我们开发了一种纠缠量化的方法，它只利用有限的资源获得的稀疏数据。这使我们能够有效地证明在进行量子存储后形成1.18 ebits的纠缠。我们开发的理论方法可以很容易地扩展到广泛的实验平台，而我们的实验结果表明，能量-时间多维纠缠的量子中继器架构的适用性。
英文摘要：
The use of multidimensional entanglement opens new perspectives for quantum information processing. However, an important challenge in practice is to certify and characterize multidimensional entanglement from measurement data that are typically limited. Here, we report the certification and quantification of two-photon multidimensional energy-time entanglement between many temporal modes, after one photon has been stored in a crystal. We develop a method for entanglement quantification which makes use of only sparse data obtained with limited resources. This allows us to efficiently certify an entanglement of formation of 1.18 ebits after performing quantum storage. The theoretical methods we develop can be readily extended to a wide range of experimental platforms, while our experimental results demonstrate the suitability of energy-time multidimensional entanglement for a quantum repeater architecture.
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