Heavy holes confined in quantum dots are predicted to be promising candidates for the realization of spin qubits with long coherence times. Here we focus on such heavy-hole states confined in Germanium hut wires. By tuning the growth density of the latter we can realize a T-like structure between two neighboring wires. Such a structure allows the realization of a charge sensor, which is electrostatically and tunnel coupled to a quantum dot, with charge-transfer signals as high as 0.3e. By integrating the T-like structure into a radio-frequency reflectometry setup, single-shot measurements allowing the extraction of hole tunneling times are performed. The extracted tunneling times of less than 10μs are attributed to the small effective mass of Ge heavy-hole states and pave the way towards projective spin readout measurements.
@article{arxiv.1708.06278,
title = {Fast Hole Tunneling Times in Germanium Hut Wires Probed by Single-Shot Reflectometry},
author = {Lada Vukušić and Josip Kukučka and Hannes Watzinger and Georgios Katsaros},
journal= {arXiv preprint arXiv:1708.06278},
year = {2017}
}