用量子非破坏探测磁振子的轴子搜索
Axion search with quantum nondemolition detection of magnons
摘要：
轴子为强CP问题提供了解决方案，并且是暗物质的主要候选者之一。提出了一种基于磁振子量子非破坏探测的轴子探测方案，量子集体自旋激发在固体中，这是预计将激发由Dine-Fischer-Srednicki-Zhitnitsky（DFSZ）模型预测的轴子-电子相互作用。原型探测器由作为电子自旋靶的亚铁磁球和超导量子比特组成。这两者都嵌入在微波腔中，这导致亚铁磁晶体中的均匀静磁模式与量子比特之间的相干有效相互作用。轴子和电子之间的耦合常数的上限被获得为$g_{aee}<2.6\times10^{-6}$，在95%置信水平下，轴子质量为$33.117$ $μ$ eV $<m_{a}<33.130$ $μ$ eV。
英文摘要：
The axion provides a solution for the strong CP problem and is one of the leading candidates for dark matter. This paper proposes an axion detection scheme based on quantum nondemolition detection of magnon, i.e., quanta of collective spin excitations in solid, which is expected to be excited by the axion-electron interaction predicted by the Dine-Fischer-Srednicki-Zhitnitsky (DFSZ) model. The prototype detector is composed of a ferrimagnetic sphere as an electronic spin target and a superconducting qubit. Both of these are embedded inside a microwave cavity, which leads to a coherent effective interaction between the uniform magnetostatic mode in the ferrimagnetic crystal and the qubit. An upper limit for the coupling constant between an axion and an electron is obtained as $g_{aee}<2.6\times10^{-6}$ at the 95% confidence level for the axion mass of $33.117$$μ$eV $<m_{a}<33.130$$μ$eV.
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