Experimental investigation of criteria for continuous variable entanglement
Experimental investigation of criteria for continuous variable entanglement
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DOI：
10.1103/physrevlett.90.043601
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发表时间：
2003-01-31
影响因子：
8.6
通讯作者：
Ralph, TC
中科院分区：
文献类型：
--
作者：
Bowen, WP;Schnabel, R;Ralph, TC
我们从两个振幅压缩光束的干涉中产生一对纠缠光束。根据EPR悖论和不可分性标准对纠缠进行了量化，这两个结果都明显超过了标准量子极限。我们通过实验分析了退相干对每个准则的影响，并证明了定性差异。我们还描述了纠缠光束中存在的所需和多余光子的数量，并根据这些变量提供了量子信息协议有效性的等高线图。
We generate a pair of entangled beams from the interference of two amplitude squeezed beams. The entanglement is quantified in terms of EPR paradox and inseparability criteria, with both results clearly beating the standard quantum limit. We experimentally analyze the effect of decoherence on each criterion and demonstrate qualitative differences. We also characterize the number of required and excess photons present in the entangled beams and provide contour plots of the efficacy of quantum information protocols in terms of these variables.