论文标题
量化准妻子状态的量子相关性并探测其适合量子传送的性
Quantifying quantum correlation of quasi-Werner state and probing its suitability for quantum teleportation
论文作者
论文摘要
研究了光子在工程中添加的显着性，研究了量子状态的单模和两模式（两部分相关）。具体而言，我们分析了两个准妻子状态的Wigner函数的行为理论上通过超级粘液构建的两个归一化的两部分$ m $ m $ - photon添加了相干状态。这使我们能够使用Wigner对数负性（WLN）来量化量子状态中存在的非经典性量，而量子相关性是根据并发，形成和量子不满的。两种模式状态的WLN对应于单模非经典性和量子相关的总和，并且观察到这两者都可以增强光子添加，从而表现出光子添加在纠缠蒸馏中的功效。通过表明准妻子的性能作为量子通道的性能进一步确定了光子添加的有用性，该量子是通过传送效率量化的单模相干和挤压状态的传送态，可以随着光子的添加而改善。此外，与一组现有结果相反，确定两种模式Wigner函数的负值总体上不能用作量子相关的见证。
The significance of photon addition in engineering the single- and two-mode (bipartite correlations) nonclassical properties of a quantum state is investigated. Specifically, we analyzed the behavior of the Wigner function of two quasi-Werner states theoretically constructed by superposing two normalized bipartite $m$-photon added coherent states. This allowed us to quantify the amount of nonclassicality present in the quantum states using Wigner logarithmic negativity (WLN), while quantum correlations are measured in terms of concurrence, entanglement of formation, and quantum discord. The WLN for a two-mode state corresponds to the sum of the single-mode nonclassicality as well as quantum correlations, and both of these are observed to enhance with photon addition manifesting the efficacy of photon addition in the entanglement distillation. Usefulness of photon addition is further established by showing that the performance of the quasi-Werner states as quantum channel for the teleportation of a single-mode coherent and squeezed states, as quantified via teleportation fidelity, improves with the photon addition. Further, in contrast to a set of existing results, it is established that the negative values of two-mode Wigner function cannot be used in general as a witness of quantum correlation.
