Nanoscale Science and Engineering Center, 3112 Etcheverry Hall, University of California, Berkeley California 94720, USA.
Phys Rev Lett. 2011 Mar 18;106(11):113601. doi: 10.1103/PhysRevLett.106.113601. Epub 2011 Mar 15.
We propose a waveguide-QED system where two single photons of distinct frequency or polarization interact strongly. The system consists of a single ladder-type three level atom coupled to a waveguide. When both optical transitions are coupled strongly to the waveguide's mode, we show that a control photon tuned to the upper transition induces a π phase shift and tunneling of a probe photon tuned to the otherwise reflective lower transition. Furthermore, the system exhibits single photon scattering by a classical control beam. Waveguide-QED schemes could be an alternative to high quality cavities or dense atomic ensembles in quantum information processing.
我们提出了一个波导-QED 系统，其中两个具有不同频率或偏振的单光子可以强烈相互作用。该系统由单个 ladder-type 三能级原子耦合到波导组成。当两个光学跃迁都强烈耦合到波导模式时，我们表明，调谐到上跃迁的控制光子会诱导调谐到反射下跃迁的探测光子发生π 相移和隧道。此外，该系统还表现出经典控制光束对单光子散射的现象。在量子信息处理中，波导-QED 方案可能是高品质腔或密集原子集合的替代方案。
