Coherent coupling of a single spin to microwave cavity photons

<jats:title>Making hybrid quantum information systems</jats:title> <jats:p> Different physical implementations of qubits—quantum bits—each have their pros and cons. An appealing idea is to combine them into hybrid architectures, taking advantage of their respective strengths. Tabuchi <jats:italic>et al.</jats:italic> placed a ferromagnetic sphere and a superconducting qubit in a cavity and used an electromagnetic mode of the cavity as the mediator between the two. They achieved strong coupling between a collective magnetic mode of the sphere and the qubit. Viennot <jats:italic>et al.</jats:italic> coupled a single spin in a double quantum dot to photons in a cavity. Both approaches hold promise for future applications. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue pp. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6246" page="405" related-article-type="in-this-issue" vol="349" xlink:href="10.1126/science.aaa3693">405</jats:related-article> and <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6246" page="408" related-article-type="in-this-issue" vol="349" xlink:href="10.1126/science.aaa3786">408</jats:related-article> </jats:p>