Continuous-variable teleportation in the characteristic-function description
Continuous-variable teleportation in the characteristic-function description
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DOI：
10.1103/physreva.74.042306
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发表时间：
2006-07
影响因子：
2.9
通讯作者：
P. Marian;T. A. Marian
中科院分区：
文献类型：
--
作者：
P. Marian;T. A. Marian
我们根据所涉及的量子态的特征函数给出了连续变量隐形传态协议的描述。 Braunstein-Kimble 协议是为不平衡零差测量以及任意输入和资源状态而编写的。我们证明该协议的输出是输入单模场与测量和经典通信引起的经典场之间的叠加。我们选择通过测量引起的场的平均光子数来描述通过隐形传态的输入状态失真。仅在对称高斯资源状态的情况下，我们才能找到最佳添加噪声与用于定义不可分离性的最小 EPR 相关性之间的关系。
We give a description of the continuous-variable teleportation protocol in terms of the characteristic functions of the quantum states involved. The Braunstein-Kimble protocol is written for an unbalanced homodyne measurement and arbitrary input and resource states. We show that the output of the protocol is a superposition between the input one-mode field and a classical one induced by measurement and classical communication. We choose to describe the input state distortion through teleportation by the average photon number of the measurement-induced field. Only in the case of symmetric Gaussian resource states we find a relation between the optimal added noise and the minimal EPR correlations used to define inseparability.