Strong coupling-enabled broadband non-reciprocity
Strong coupling-enabled broadband non-reciprocity
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强耦合宽带非互易性
DOI：
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
V. Vinokur
中科院分区：
文献类型：
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作者：
Xufeng Zhang;A. Galda;Xu Han;D. Jin;V. Vinokur
信号传输的非互易性增强了通信信道的容量，并保护传输质量免受可能的信号不稳定性的影响，从而成为确保相干信息处理的重要组成部分。然而，非互易传输需要打破时间反演对称性（TRS），这带来了阻碍进展的实际和基本特性的挑战。在这里，我们报告了一个新的计划，实现宽带非互易性使用一个专门设计的混合微波腔。TRS破缺是通过微波腔中选定的手征模与铁磁钇铁石榴石（YIG）球中的单个集体自旋激发（磁振子）之间的强相干耦合实现的。在传输中的非互易性被观察到跨越近0.5 GHz的频带，这超过了两个数量级的先前实现的带宽。我们的发现为在经典和量子体系中广泛的系统中进行稳健的相干信息处理开辟了新的方向。
Non-reciprocity of signal transmission enhances capacity of communication channels and protects transmission quality against possible signal instabilities, thus becoming an important component ensuring coherent information processing. However, non-reciprocal transmission requires breaking time-reversal symmetry (TRS) which poses challenges of both practical and fundamental character hindering the progress. Here we report a new scheme for achieving broadband non-reciprocity using a specially engineered hybrid microwave cavity. The TRS breaking is realized via strong coherent coupling between a selected chiral mode in the microwave cavity and a single collective spin excitation (magnon) in a ferromagnetic yttrium iron garnet (YIG) sphere. The non-reciprocity in transmission is observed spanning nearly a 0.5 GHz frequency band, which outperforms by two orders of magnitude the previously achieved bandwidths. Our findings open new directions for robust coherent information processing in a broad range of systems in both classical and quantum regimes.