arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1006.0837quant-ph
收藏

二分高斯态的量子表征

Quantum characterization of bipartite Gaussian states

D. Buono, G. Nocerino, V. D'Auria, A. Porzio, S. Olivares, M. G. A. Paris

摘要:

高斯二分态是实现连续变量量子信息协议的基本工具。它们的完整表征是通过重构相应的协方差矩阵来获得的。在这里,我们详细描述和实验证明了一个强大的和可靠的方法来充分表征二分光高斯态通过一个单一的零差检测器。我们已经成功地将我们的方法应用于产生一对热交叉偏振纠缠CW频率简并光束的亚阈值II型光学参量振荡器产生的二分态。该方法提供了一个可靠的重建的协方差矩阵,并允许检索所有的物理信息的状态下调查。这些包括可观测的量,如能量和压缩,以及不可观测的量,如纯度,熵和纠缠。我们的程序还包括先进的测试高斯的状态,总的来说,代表了一个强大的工具来研究二分高斯态从生成阶段的检测。

英文摘要:

Gaussian bipartite states are basic tools for the realization of quantum information protocols with continuous variables. Their complete characterization is obtained by the reconstruction of the corresponding covariance matrix. Here we describe in details and experimentally demonstrate a robust and reliable method to fully characterize bipartite optical Gaussian states by means of a single homodyne detector. We have successfully applied our method to the bipartite states generated by a sub-threshold type-II optical parametric oscillator which produces a pair of thermal cross-polarized entangled CW frequency degenerate beams. The method provide a reliable reconstruction of the covariance matrix and allows to retrieve all the physical information about the state under investigation. These includes observable quantities, as energy and squeezing, as well as non observable ones as purity, entropy and entanglement. Our procedure also includes advanced tests for Gaussianity of the state and, overall, represents a powerful tool to study bipartite Gaussian state from the generation stage to the detection one.

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。

↑