Institut für Experimentalphysik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria.
Institut für Experimentalphysik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria and Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Technikerstraße 21a, 6020 Innsbruck, Austria.
Phys Rev Lett. 2015 Jan 16;114(2):023602. doi: 10.1103/PhysRevLett.114.023602. Epub 2015 Jan 14.
We prepare a maximally entangled state of two ions and couple both ions to the mode of an optical cavity. The phase of the entangled state determines the collective interaction of the ions with the cavity mode, that is, whether the emission of a single photon into the cavity is suppressed or enhanced. By adjusting this phase, we tune the ion-cavity system from sub- to superradiance. We then encode a single qubit in the two-ion superradiant state and show that this encoding enhances the transfer of quantum information onto a photon.
我们制备了两个离子的最大纠缠态，并将两个离子耦合到光腔模式中。纠缠态的相位决定了离子与腔模的集体相互作用，即是否抑制或增强单个光子进入腔的发射。通过调整这个相位，我们将离子腔系统从亚辐射调谐到超辐射。然后，我们在两个离子的超辐射态中编码一个单量子比特，并表明这种编码增强了量子信息向光子的转移。
