Quantum Sciences Seminar - Xuedong Hu, University of Buffalo - Optimizing Electron-spin-cavity coupling via a double quantum dot

Thu, Mar 29, 2012, 2:00 pm to 3:30 pm
Joseph Henry Room

We investigate how to couple an electron spin in a semiconductor double quantum dot to a microwave cavity via the electrically driven spin resonance technique. Spin degree of freedom is accessed here through either the spin-orbit interaction or an inhomogeneous magnetic field. We derive the effective spin-photon coupling Hamiltonian, and assess the coupling strength from the cavity and quantum dot parameters. We also calculate the spin relaxation rate in the regime when spin-photon coupling is strong. We show that a tunnel coupled double dot with a single confined electron presents an intriguing system to reach the strong coupling limit between the electron spin and the cavity photons, and identify Si as a good candidate material for this purpose. We thank support by NSA/LPS through ARO.