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 1208.3569quant-phmath-phmath.MPphysics.data-an
收藏

量子数系综和多模高斯态的渐近最优量子信道反转

Asymptotically optimal quantum channel reversal for qudit ensembles and multimode Gaussian states

Peter Bowles, Madalin Guta, Gerardo Adesso

备注：
17 pages, 3 figures
发表信息：
New J. Phys. 14 (2012) 113041
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

我们研究了任意量子信道C的最优反转问题，该信道C独立地作用于n个相同制备的d维量子系统的系综的每个分量。在大系综的限制下，我们构造了必须应用于输出系综状态的最佳反向通道R*，以检索在输入状态中准备的m个系统的较小系综，具有最高可能速率m/n。通过将问题映射为量子经典连续变量系统上高斯通道的最优反转，得到了问题的解。我们的一般结果可以很容易地应用于改进鲁棒的长距离量子通信的实现。作为一个例子，我们研究了作用于多量子比特寄存器的相位翻转通道的最佳反转率。

英文摘要：

We investigate the problem of optimally reversing the action of an arbitrary quantum channel C which acts independently on each component of an ensemble of n identically prepared d-dimensional quantum systems. In the limit of large ensembles, we construct the optimal reversing channel R* which has to be applied at the output ensemble state, to retrieve a smaller ensemble of m systems prepared in the input state, with the highest possible rate m/n. The solution is found by mapping the problem into the optimal reversal of Gaussian channels on quantum-classical continuous variable systems, which is here solved as well. Our general results can be readily applied to improve the implementation of robust long-distance quantum communication. As an example, we investigate the optimal reversal rate of phase flip channels acting on a multi-qubit register.

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。

↑