Probabilistic cloning of coherent states without a phase reference
Probabilistic cloning of coherent states without a phase reference
复制标题
DOI：
10.1103/physreva.86.010305
复制
发表时间：
2012-07-23
影响因子：
2.9
通讯作者：
Andersen, Ulrik L.
中科院分区：
文献类型：
--
作者：
Mueller, Christian R.;Wittmann, Christoffer;Andersen, Ulrik L.
我们提出了一个概率克隆计划独立于任何相位参考。该方案完全基于相位随机位移和光子计数，省略了对非经典资源和非线性材料的需求。在一个实验实现中，我们采用该计划克隆相干态的相位协变字母表，并证明克隆是能够超越迄今为止表现最好的确定性计划。输出状态之间的协方差分析表明，不相关的克隆可以渐近接近。这同时说明了如何通过无噪声前置放大来补偿相干态损失的影响。
We present a probabilistic cloning scheme operating independently of any phase reference. The scheme is based solely on a phase-randomized displacement and photon counting, omitting the need for nonclassical resources and nonlinear materials. In an experimental implementation, we employ the scheme to clone coherent states from a phase covariant alphabet and demonstrate that the cloner is capable of outperforming the hitherto best-performing deterministic scheme. An analysis of the covariances between the output states shows that uncorrelated clones can be approached asymptotically. This simultaneously demonstrates how the effect of loss on coherent states can be compensated via noiseless preamplification.