



01674nas a2200181   4500008004100000245007500041210006900116260001500185300001100200490000700211520113600218100001501354700001101369700001901380700001801399700001901417856005601436       2017                        eng d00aInput-output theory for spin-photon coupling in Si double quantum dots0 aInputoutput theory for spinphoton coupling in Si double quantum   c2017/12/22  a2354340 v963 a<p><span style="color: rgb(34, 34, 34); font-family: &quot;Helvetica Neue&quot;, Helvetica, Roboto, Arial, sans-serif; font-size: 14px;">The interaction of qubits via microwave frequency photons enables long-distance qubit-qubit coupling and facilitates the realization of a large-scale quantum processor. However, qubits based on electron spins in semiconductor quantum dots have proven challenging to couple to microwave photons. In this theoretical work we show that a sizable coupling for a single electron spin is possible via spin-charge hybridization using a magnetic field gradient in a silicon double quantum dot. Based on parameters already shown in recent experiments, we predict optimal working points to achieve a coherent spin-photon coupling, an essential ingredient for the generation of long-range entanglement. Furthermore, we employ input-output theory to identify observable signatures of spin-photon coupling in the cavity output field, which may provide guidance to the experimental search for strong coupling in such spin-photon systems and opens the way to cavity-based readout of the spin qubit.</span></p>1 aBenito, M.1 aMi, X.1 aTaylor, J., M.1 aPetta, J., R.1 aBurkard, Guido  uhttps://link.aps.org/doi/10.1103/PhysRevB.96.235434