Study of the microwave-induced transport through a quantum dot inserted in a 35-GHz loop-gap resonator

We report on the design and performance of an experimental setup dedicated to the high-frequency manipulation of individual electron spins in quantum dots in the milliKelvin temperature range. Engel and Loss [Phys. Rev. Lett. 86 (2001) 004648] proposed how the spin-state can be read out via a charge current through the dot in the Coulomb blockade state. A major challenge is that fast manipulation compared to decoherence requires a large microwave (mw) magnetic field, which is technically difficult to produce on a nanometer scale without much power and without substantial capacitive coupling between the dot and its electromagnetic surrounding. We show that our setup overcomes these difficulties.