Spin Qubit Leapfrogging: Dynamics of shuttling electrons on top of another
This work explores using valley degree of freedom to enable mobile spin qubits to 'leapfrog' over a stationary quantum dot. The protocol implements an entangling SWAPγ gate by forcing a transition into excited valley states during detuning. This method allows high-fidelity entanglement between mobile and stationary qubits, offering a way to utilize low-valley-splitting regions in silicon devices.