论文标题
在远程状态准备中对资源的最佳开发
Optimal exploitation of the resource in remote state preparation
论文作者
论文摘要
考虑了具有共享量子状态和经典通信的远程状态制备（RSP）的传输效率（TE）。以下[B。 Daki等人，Nat。物理。 8，666（2012）]，协议的编码和解码策略分别仅限于与物理相关的投射测量和单一操作员分别相关类别。结果表明，与以前的参数相反，二次保真度以及线性保真度可能是量化RSP TE的有效功能。然后，在完全优化的方案中评估了协议的TE，以线性和二次保真度来评估，该方案包括对编码参数的最大化以及对解码参数的有意义的最大化。结果表明，在这种情况下，TE量表以资源状态的平方相关矩阵的两个最大特征值的总和仅适用于产品状态。这种方法成功地量化了根据资源状态参数的协议的性能，并提供了一种比较任何两个资源状态对RSP的有用性的方法。
Transmission efficiency (TE) of remote state preparation (RSP) with a shared quantum state and one bit of classical communication is considered. Following [B. Daki et al., Nat. Phys. 8, 666 (2012)], the encoding and decoding strategies of the protocol are restricted to the physically relevant classes of projective measurements and unitary operators, respectively. It is shown that contrary to the previous arguments, the quadratic fidelity as well as the linear fidelity could be a valid figure of merit to quantify the TE of RSP. Then, the TE of the protocol in terms of both linear and quadratic fidelities is evaluated in a fully optimized scenario which includes the maximization over the encoding parameters as well as a meaningful maximization over the decoding parameters. The results show that in this scenario, the TE scales with the sum of the two largest eigenvalues of the squared correlation matrix of the resource state that is zero only for product states. This approach successfully quantifies the performance of the protocol in terms of the resource state parameters and provides a means to compare the usefulness of any two resource states for RSP.
