Coupling a Germanium Hut Wire Hole Quantum Dot to a Superconducting Microwave Resonator
Yan Li, Shuxiao Li, Fei Gao +10 more
Realizing a strong coupling between spin and resonator is an important issue for scalable quantum computation in semiconductor systems. Benefiting from the advantages of a strong spin–orbit coupling strength and long coherence time, the Ge hut wire, which is proposed to be site-controlled grown for scalability, is considered to be a promising candidate to achieve this goal. Here we present a hybrid architecture in which an on-chip superconducting microwave resonator is coupled to the holes in a Ge quantum dot. The charge stability diagram can be obtained from the amplitude and phase responses of the resonator independently from the DC transport measurement. Furthermore, we estimate the hole-resonator coupling rate of g c /2π = 148 MHz in the single quantum dot-resonator system and estimate the spin–resonator coupling rate g s /2π to be in the range 2–4 MHz. We anticipate that strong coupling between hole spins and microwave photons in a Ge hut wire is feasible with optimized schemes in the future.
Nano Letters•Feb 22, 2018•45 citations