Fast Hole Tunneling Times in Germanium Hut Wires Probed by Single-Shot Reflectometry

Abstract

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 10$\mu$s are attributed to the small effective mass of Ge heavy-hole states and pave the way towards projective spin readout measurements.

References in corpus (8)

• Single-shot read-out of an individual electron spin in a quantum dot
• Fast Single-Charge Sensing with an rf Quantum Point Contact
• Spin decoherence of a heavy hole coupled to nuclear spins in a quantum dot
• Spin relaxation and decoherence of holes in quantum dots
• Strong and Tunable Spin-Orbit Coupling of One-Dimensional Holes in Ge/Si Core/Shell Nanowires
• Architecture for high-sensitivity single-shot readout and control of the electron spin of individual donors in silicon
• Heavy hole states in Germanium hut wires
• A Radio Frequency Charge Parity Meter

Cited by in corpus (1)

• Assessing the potential of Ge/SiGe quantum dots as hosts for singlet-triplet qubits