A tunable hybrid qubit in a triple quantum dot

TL;DR

This paper demonstrates a multi-electron hybrid qubit in a triple quantum dot with tunable operation frequency, good coherence, and electrical control, advancing quantum computing hardware capabilities.

Contribution

It introduces a tunable, multi-electron hybrid qubit in a triple quantum dot with experimentally verified coherence and control, expanding quantum dot qubit technology.

Findings

Operation frequency tunable from 2 to 15 GHz

Good coherence time relative to gate time

Electrical initialization, control, and measurement

Abstract

We experimentally demonstrate quantum coherent dynamics of a triple-dot-based multi-electron hybrid qubit. Pulsed experiments show that this system can be conveniently initialized, controlled, and measured electrically, and has good coherence time as compared to gate time. Furthermore, the current multi-electron hybrid qubit has an operation frequency that is tunable in a wide range, from 2 to about 15 GHz. We provide qualitative understandings of the experimental observations by mapping it onto a three-electron system, and compare it with the double dot hybrid qubit and the all-exchange triple-dot qubit.