Evans R E, Bhaskar M K, Sukachev D D, Nguyen C T, Sipahigil A, Burek M J, Machielse B, Zhang G H, Zibrov A S, Bielejec E, Park H, Lončar M, Lukin M D
Department of Physics, Harvard University, Cambridge, MA 02138, USA.
Institute for Quantum Information and Matter and Thomas J. Watson, Sr., Laboratory of Applied Physics, California Institute of Technology, Pasadena, CA 91125, USA.
Science. 2018 Nov 9;362(6415):662-665. doi: 10.1126/science.aau4691. Epub 2018 Sep 20.
Photon-mediated interactions between quantum systems are essential for realizing quantum networks and scalable quantum information processing. We demonstrate such interactions between pairs of silicon-vacancy (SiV) color centers coupled to a diamond nanophotonic cavity. When the optical transitions of the two color centers are tuned into resonance, the coupling to the common cavity mode results in a coherent interaction between them, leading to spectrally resolved superradiant and subradiant states. We use the electronic spin degrees of freedom of the SiV centers to control these optically mediated interactions. Such controlled interactions will be crucial in developing cavity-mediated quantum gates between spin qubits and for realizing scalable quantum network nodes.
量子系统之间的光子介导相互作用对于实现量子网络和可扩展量子信息处理至关重要。我们展示了耦合到金刚石纳米光子腔的硅空位（SiV）色心对之间的这种相互作用。当两个色心的光学跃迁被调谐到共振时，与公共腔模的耦合导致它们之间的相干相互作用，从而产生光谱分辨的超辐射和亚辐射态。我们利用SiV中心的电子自旋自由度来控制这些光学介导的相互作用。这种可控相互作用对于开发自旋量子比特之间的腔介导量子门以及实现可扩展量子网络节点至关重要。
