



01974nas a2200181   4500008004100000245005000041210004800091260001500139520145800154100001101612700001501623700001301638700001801651700001901669700001901688700001801707856006701725       2018                        eng d00aA coherent spin–photon interface in silicon0 acoherent spin–photon interface in silicon  c2018/02/143 a<p><span style="color: rgb(34, 34, 34); font-family: Lora, Palatino, Times, &quot;Times New Roman&quot;, serif; font-size: 17px; letter-spacing: 0.17px;">Electron spins in silicon quantum dots are attractive systems for quantum computing owing to their long coherence times and the promise of rapid scaling of the number of dots in a system using semiconductor fabrication techniques. Although nearest-neighbour exchange coupling of two spins has been demonstrated, the interaction of spins via microwave-frequency photons could enable long-distance spin&ndash;spin coupling and connections between arbitrary pairs of qubits (&lsquo;all-to-all&rsquo; connectivity) in a spin-based quantum processor. Realizing coherent spin&ndash;photon coupling is challenging because of the small magnetic-dipole moment of a single spin, which limits magnetic-dipole coupling rates to less than 1 kilohertz. Here we demonstrate strong coupling between a single spin in silicon and a single microwave-frequency photon, with spin&ndash;photon coupling rates of more than 10 megahertz. The mechanism that enables the coherent spin&ndash;photon interactions is based on spin&ndash;charge hybridization in the presence of a magnetic-field gradient. In addition to spin&ndash;photon coupling, we demonstrate coherent control and dispersive readout of a single spin. These results open up a direct path to entangling single spins using microwave-frequency photons.</span></p>1 aMi, X.1 aBenito, M.1 aPutz, S.1 aZajac, D., M.1 aTaylor, J., M.1 aBurkard, Guido1 aPetta, J., R.  uhttps://www.nature.com/articles/nature25769#author-information