Two-way interconversion of millimeter-wave and optical fields in Rydberg gases
Two-way interconversion of millimeter-wave and optical fields in Rydberg gases
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DOI：
10.1088/1367-2630/18/9/093030
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发表时间：
2016-01
影响因子：
3.3
通讯作者：
M. Kiffner;A. Feizpour;K. Kaczmarek;D. Jaksch;J. Nunn
中科院分区：
文献类型：
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作者：
M. Kiffner;A. Feizpour;K. Kaczmarek;D. Jaksch;J. Nunn
我们表明，冷里德堡气体能够实现一种高效的六波混频过程，在此过程中，太赫兹或微波场能够相干地转换为光场，反之亦然。里德堡态的长寿命、毫米波与里德堡跃迁的强耦合以及与电磁诱导透明相关的量子干涉效应使得这一过程成为可能。由于里德堡能级系内存在大量跃迁，我们的频率转换方案适用于广谱的毫米波，并且我们分别讨论了基于聚焦太赫兹光束和波导限制的毫米波场的两种可能的实现方式。我们分析了铷原子中太赫兹场和光场相互转换的一个实际例子，发现转换效率原则上可超过90%。
We show that cold Rydberg gases enable an efficient six-wave mixing process where terahertz or microwave fields are coherently converted into optical fields and vice versa. This process is made possible by the long lifetime of Rydberg states, the strong coupling of millimeter waves to Rydberg transitions and by a quantum interference effect related to electromagnetically induced transparency. Our frequency conversion scheme applies to a broad spectrum of millimeter waves due to the abundance of transitions within the Rydberg manifold, and we discuss two possible implementations based on focussed terahertz beams and millimeter wave fields confined by a waveguide, respectively. We analyse a realistic example for the interconversion of terahertz and optical fields in rubidium atoms and find that the conversion efficiency can in principle exceed 90%.