Two-electron double quantum dot coupled to coherent photon and phonon fields

Two-electron states of a double quantum dot (DQD) under irradiation of coherent boson (photon and phonon) fields are studied by measuring spin-flip tunneling current in the Pauli spin blockade regime. This measurement scheme allows us to investigate Rabi splitting and associated boson dressed states particularly in the deep dispersive regime where the detuning $\ensuremath{\delta}\ensuremath{\equiv}\ensuremath{\hbar}\ensuremath{\omega}\ensuremath{-}{E}_{\mathrm{AB}}$ between the boson energy $\ensuremath{\hbar}\ensuremath{\omega}$ and energy spacing ${E}_{\mathrm{AB}}$ of the two-level system is significantly large ($\ensuremath{\delta}\ensuremath{\sim}\ensuremath{\hbar}\ensuremath{\omega}$), where the permanent dipole moment in the DQD plays a significant role in the hybridization.