Department of Applied Physics, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan.
JST, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan.
Nat Commun. 2019 Mar 11;10(1):1160. doi: 10.1038/s41467-019-08975-8.
In a cavity quantum electrodynamics (QED) system, where atoms coherently interact with photons in a cavity, the eigenstates of the system are the superposition states of atoms and cavity photons, the so-called dressed states of atoms. When two cavities are connected by an optical fiber with negligible loss, the coherent coupling between the cavities gives rise to photonic normal modes. One of these normal modes is the fiber-dark mode, in which photons are delocalized in the two distant cavities. Here we demonstrate the setting of coupled-cavities QED, where two nanofiber cavity-QED systems are coherently connected by a meter-long low-loss channel in an all-fiber fashion. Specifically, we observe dressed states of distant atoms with delocalized photons of the fiber-dark normal mode. Our system will provide a platform for the study of delocalized atomic and photonic states, photonic many-body physics, and distributed quantum computation.
在腔量子电动力学 (QED) 系统中，原子与腔中的光子相干相互作用，系统的本征态是原子和腔光子的叠加态，即所谓的原子束缚态。当两个腔通过光纤连接，损耗可以忽略时，腔之间的相干耦合会产生光子的模。其中一个模是光纤暗模，其中光子在两个远距离腔中离域。在这里，我们演示了耦合腔 QED 的设置，其中两个纳米光纤腔-QED 系统通过米长的低损耗通道以全光纤的方式相干连接。具体来说，我们观察到具有光纤暗模离域光子的远程原子的束缚态。我们的系统将为离域原子和光子态、光子多体物理和分布式量子计算的研究提供一个平台。
