Time Resolved Control of Electron Tunnelling Times and Single-shot Spin Readout in a Quantum Dot

TL;DR

This paper demonstrates time-resolved control of electron tunneling and single-shot spin readout in a triple quantum dot system, achieving tunable tunneling times and a long spin relaxation time of 300 microseconds.

Contribution

It introduces a method to calibrate tunnel barriers and implements the Delft protocol for single-shot spin readout in a triple quantum dot device.

Findings

Tunable tunneling times over three orders of magnitude.

Achieved a spin relaxation time of 300 microseconds at 10T.

Demonstrated full counting statistics and averaging techniques.

Abstract

We are pursuing a capability to perform time resolved manipulations of single spins in quantum dot circuits involving more than two quantum dots. In this paper, we demonstrate full counting statistics as well as averaging techniques we use to calibrate the tunnel barriers. We make use of this to implement the Delft protocol for single shot single spin readout in a device designed to form a triple quantum dot potential. We are able to tune the tunnelling times over around three orders of magnitude. We obtain a spin relaxation time of 300 microseconds at 10T.