来自金属纳米粒子的量子光
Quantum Light from a Metal Nanoparticle
摘要：
单光子源的运行速度受到量子发射体（QE）的自发发射率的基本限制。速率加速的当前范例建议将QE耦合到金属纳米结构，特别是金属纳米颗粒（MNP）。在这里，我们证明，与这种方法相反，MNP本身可以表现为量子发射体。我们确定了一阶和二阶关联函数的光自发发射的MNP强烈耦合到QE，并表明，这种光应该表现出亚泊松光子统计和完美的光子反聚束。这一发现为具有前所未有的高达100 THz的产生率的单光子源开辟了前景。
英文摘要：
Single-photon sources are subjected to a fundamental limitation in the speed of operation dictated by the spontaneous emission rate of quantum emitters (QEs). The current paradigm of the rate acceleration suggests coupling of a QE to a metal nanostructure, in particular, a metal nanoparticle (MNP). Here, we demonstrate that, in contrast to this approach, a MNP itself can behave as a quantum emitter. We determine both the first- and second-order correlation functions of light spontaneously emitted by a MNP strongly coupled to a QE and show that this light should exhibit sub-Poissonian photon statistics and perfect photon antibunching. This discovery opens a prospect to single-photon sources with unprecedented generation rates up to 100 THz.
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