Research output: Contribution to Journal/Magazine › Journal article › peer-review
| Article number | 183603 |
|---|---|
| <mark>Journal publication date</mark> | 7/05/2010 |
| <mark>Journal</mark> | Physical review letters |
| Issue number | 18 |
| Volume | 104 |
| Number of pages | 4 |
| Pages (from-to) | - |
| Publication Status | Published |
| <mark>Original language</mark> | English |
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.