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中国物理学会期刊

量子网络中基于弹性散射的微波光子传输调控

CSTR: 32037.14.aps.74.20250404

Control of microwave photon transmissions in microwave quantum networks by elastic scattering

CSTR: 32037.14.aps.74.20250404
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  • 利用弹性散射对微波量子网络中微波光子的传输行为进行无能耗的调控, 对微波量子器件的研发和构建多节点微波量子网络等具有现实意义. 本文从最简单的微波光子单个散射体的弹性散射出发, 对构成量子网络中最简单节点器件, 如LC回路、单个约瑟夫森结器件和超导量子干涉器件等对微波光子弹性散射行为进行了详细讨论. 结果表明, 线性LC回路对微波光子的弹性散射行为与它们在经典微波电路中的作用相同, 但非线性约瑟夫森结对微波光子弹性散射行为的调控, 则与其在网络中的等效模型建模有关; 约瑟夫森结的并联或串联嵌入模型对微波光子的弹性散射, 表现出截然不同的调控行为. 为检验哪种建模是物理上正确的, 本文通过实验测量了传输线中嵌入单个约瑟夫森结情况下的微波光子传输系数, 证实了并联嵌入模型的正确性. 基于这些单个散射体弹性散射行为的研究, 本文提出了一种通过旁路电流调制直流超导量子干涉器件磁通来实现微波光子弹性散射行为调控的方案, 有望应用于微波量子网络的构建.

     

    Elastic scattering is one of the useful methods to control the transmission behaviors of microwave photons transporting in microwave quantum networks without energy consumption. Therefore, it is of practical significance for developing microwave quantum devices and constructing multi-node microwave quantum networks. The transmission line embedded by a single Josephson junction can be described by different circuit models (series and parallel). In this work, we first theoretically analyze the transmission characteristics of microwave photons scattered by different elastic scattering models described by series or parallel embedding models, generated by a single LC loop or a nonlinear Josephson junction device, respectively. The classical microwave transport theory predicts that the series LC loop and the parallel LC loop lead to different elastic scattering behaviors of microwave photons, i.e. the series LC circuit yields the resonant reflection and the parallel LC circuit leads alternatively to the resonant transmission. Recently, the transport properties of microwave photons scattered by a Josephson junction embedded in a transmission line have been discussed, and the results suggested that the Josephson junction embedded in the transmission line can be described by a series embedding circuit, which implies the resonant reflection. We argue here that if the Josephson junction is embedded in parallel in the transmission line, the elastically scattered microwave photons should be transmitted by resonant transmission. In order to test which of the above two different embedding circuit models yielding the completely different elastic scattering behaviors, is physically correct, we then fabricate such a device, i.e. a single Joseph junction device embedded in a transmission line, and measure its elastic scattering transmission coefficient at an extremely low temperature. The results are consistent with the expected effect of the parallel embedding circuit model, but inconsistent with the behaviors predicted by the series embedding circuit model in the literature. According to the above theoretical and experimental analyses of the elastic scattering of a single Josephson junction device, we further propose a scheme to control the elastic scattering behavior of microwave photons by modulating a DC superconducting quantum interference device with a bypass current, which can be applied to the construction of a microwave quantum network based on elastic scattering node controls.

     

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