论文标题
朝向频谱多路复用量子中继器
Towards a spectrally multiplexed quantum repeater
论文作者
论文摘要
扩展的量子网络基于量子中继器，这些中继器通常以高效且预示的方式在多个网络节点上以纠缠的分布。许多中继器体系结构都需要纠缠光子对的多重源，多路复用量子记忆以及区分多重模式的光子检测。在这里，我们证明了（1）在非线性晶体中同时使用（1）频谱多路复用的腔体增强的自发参数下转换； （2）一个虚拟成像的阶梯阵列，该阵列可以将光谱模式映射到不同的空间模式上，以进行频率选择性检测； （3）低温冷却的TM3+：linbo3晶体，该晶体允许在一种方法中进行光谱滤波，该方法预期其用作光谱式量子记忆。通过巧合测量，我们证明了能量相关的光子对之间的量子相关性以及所有其他光子之间的相关强度的强烈降低。这构成了朝着频率多路复用量子中继器迈出的重要一步。
Extended quantum networks are based on quantum repeaters that often rely on the distribution of entanglement in an efficient and heralded fashion over multiple network nodes. Many repeater architectures require multiplexed sources of entangled photon pairs, multiplexed quantum memories, and photon detection that distinguishes between the multiplexed modes. Here we demonstrate the concurrent employment of (1) spectrally multiplexed cavity-enhanced spontaneous parametric down-conversion in a nonlinear crystal; (2) a virtually-imaged phased array that enables mapping of spectral modes onto distinct spatial modes for frequency-selective detection; and (3) a cryogenically cooled Tm3+:LiNbO3 crystal that allows spectral filtering in an approach that anticipates its use as a spectrally-multiplexed quantum memory. Through coincidence measurements, we demonstrate quantum correlations between energy-correlated photon pairs and a strong reduction of the correlation strength between all other photons. This constitutes an important step towards a frequency multiplexed quantum repeater.
