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Gaussian entanglement distribution with gigahertz bandwidth

机译:Gigahertz带宽的高斯纠缠分布

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摘要

The distribution of entanglement with Gaussian statistic can be used to generate a mathematically proven secure key for quantum cryptography. The distributed secret key rate is limited by the entanglement strength, the entanglement bandwidth, and the bandwidth of the photoelectric detectors. The development of a source for strongly bipartite entangled light with high bandwidth promises an increased measurement speed and a linear boost in the secure data rate. Here, we present the experimental realization of a Gaussian entanglement source with a bandwidth of more than 1.25 GHz. The entanglement spectrum was measured with balanced homodyne detectors and was quantified via the inseparability criterion introduced by Duan and coworkers with a critical value of 4 below which entanglement is certified. Our measurements yielded an inseparability value of about 1.8 at a frequency of 300 MHz to about 2.8 at 1.2 GHz, extending further to about 3.1 at 1.48 GHz. In the experiment we used two 2.6 mm long monolithic periodically poled potassium titanyl phosphate (KTP) resonators to generate two squeezed fields at the telecommunication wavelength of 1550 nm. Our result proves the possibility of generating and detecting strong continuous-variable entanglement with high speed. (C) 2016 Optical Society of America
机译:使用高斯统计的缠结分布可用于生成量子密码术的数学证明的安全键。分布式秘密密钥率受到缠结强度,缠结带宽和光电检测器的带宽的限制。具有高带宽的强烈双链缠结光源的源的开发承诺增加了测量速度和基于安全数据速率的线性升压。在这里,我们介绍了高斯纠缠源的实验性,带宽超过1.25 GHz。用平衡的杂质探测器测量纠缠频谱,通过段和工友引入的不可分割性标准量化,临界值4下调,纠缠已被认证。我们的测量结果在1.2GHz的300 MHz的频率下,在300 MHz至约2.8的频率下产生了约1.8的不可分割值,进一步延伸至1.48GHz的约3.1。在实验中,我们使用了两种2.6mm长的整体定期氧化钛磷酸钛(KTP)谐振器,以在电信波长为1550nm处产生两个挤压的场。我们的结果证明了以高速产生和检测强大的连续变量纠缠的可能性。 (c)2016年光学学会

著录项

  • 来源
    《Optics Letters》 |2016年第21期|共4页
  • 作者单位

    Univ Hamburg Inst Laserphys Luruper Chaussee 149 D-22761 Hamburg Germany;

    Univ Hamburg Inst Laserphys Luruper Chaussee 149 D-22761 Hamburg Germany;

    Leibniz Univ Hannover Inst Gravitat Phys Callinstr 38 D-30167 Hannover Germany;

    Univ Hamburg Inst Laserphys Luruper Chaussee 149 D-22761 Hamburg Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 计量学;光学;
  • 关键词

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