NEC Nano Electronics Research Laboratories, Tsukuba, Ibaraki 305-8501, Japan.
Phys Rev Lett. 2010 May 7;104(18):183603. doi: 10.1103/PhysRevLett.104.183603. Epub 2010 May 6.
We report amplification of electromagnetic waves by a single artificial atom in open 1D space. Our three-level artificial atom--a superconducting quantum circuit--coupled to a transmission line presents an analog of a natural atom in open space. The system is the most fundamental quantum amplifier whose gain is limited by a spontaneous emission mechanism. The noise performance is determined by the quantum noise revealed in the spectrum of spontaneous emission, also characterized in our experiments.
我们报告了在开放式 1D 空间中单个人工原子对电磁波的放大。我们的三能级人工原子——一个超导量子电路——与传输线耦合，呈现出开放式空间中自然原子的模拟。该系统是最基本的量子放大器，其增益受到自发辐射机制的限制。噪声性能由自发发射谱中揭示的量子噪声决定，我们的实验也对其进行了特征化。
