Quantum up-conversion of squeezed vacuum states from 1550 to 532 nm.
Quantum up-conversion of squeezed vacuum states from 1550 to 532 nm.
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DOI：
10.1103/physrevlett.112.073602
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发表时间：
2014-02
影响因子：
8.6
通讯作者：
C. Vollmer;C. Baune;A. Samblowski;T. Eberle;V. Händchen;J. Fiurášek;R. Schnabel
中科院分区：
文献类型：
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作者：
C. Vollmer;C. Baune;A. Samblowski;T. Eberle;V. Händchen;J. Fiurášek;R. Schnabel
压缩真空态在量子信息和量子计量学中构成了特别有用的资源。这些状态的频率转换对于在一系列下游应用中提供不同波长之间的桥梁以及提供在迄今为止无法到达的波长处产生压缩状态的方法是重要的。本文首次研究了无载流子光压缩真空态的外量子上转换。我们的结果证明，非简并和频产生保持了压缩输入态的光子对和高阶光子对之间的相干性。
Squeezed vacuum states constitute a particularly useful resource in quantum information as well as in quantum metrology. The frequency conversion of these states is important to provide the bridge between different wavelengths within a sequence of downstream applications and also to provide a way for squeezed-state generation at so-far inaccessible wavelengths. Here we demonstrate the external quantum up-conversion of carrier-light-free squeezed vacuum states for the first time. Our result proves that nondegenerate sum-frequency generation preserves the coherences that are present between photon pairs and higher-order photon pairs of the squeezed input state.