Surface plasmons allow electromagnetic fields to be confined to subwavelength scale, well beyond the classical optical diffraction limit. With continuous reduction of optical mode volume into the deep subwavelength scale, a new era of quantum plasmonics opens up that investigates the quantum behavior of surface plasmons and their interactions with matter. This emerging and exciting field creates many new opportunities in advancing the boundaries of fundamental science and applied quantum technology. This review covers recent breakthroughs from three unique and important perspectives: the fundamental quantum properties of plasmon-polaritons, plasmon-polaritons interacting with quantum emitters, and plasmon-polaritons stepping into quantum technology. A clear development map of quantum plasmonics is also established for the reader.

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量子等离子体：基础和应用光子学的新机遇

表面等离子体激元允许将电磁场限制在亚波长范围内，远远超出经典的光学衍射极限。随着光学模式体积不断减少到深亚波长尺度，量子等离子体的新时代开启了，它研究了表面等离子体的量子行为及其与物质的相互作用。这个新兴且令人兴奋的领域为推进基础科学和应用量子技术的边界创造了许多新机会。这篇综述从三个独特而重要的角度介绍了最近的突破：等离子体-极化子的基本量子特性、与量子发射器相互作用的等离子体-极化子和进入量子技术的等离子体-极化子。还为读者建立了清晰的量子等离子体发展图。