Charge-qubit operation of an isolated double quantum dot

TL;DR

This paper demonstrates a silicon double quantum-dot charge qubit with extended coherence time due to electrical isolation, manipulated by gate pulses and measured via a single-electron transistor, advancing quantum computing technology.

Contribution

It introduces an isolated silicon double quantum-dot charge qubit with significantly longer coherence times compared to previous semiconductor charge qubits.

Findings

Longer coherence times achieved due to electrical isolation

Effective manipulation using short gate pulses

Successful measurement with a single-electron transistor

Abstract

We have investigated coherent time evolution of pseudo-molecular states of an isolated (leadless) silicon double quantum-dot, where operations are carried out via capacitively-coupled elements. Manipulation is performed by short pulses applied to a nearby gate, and measurement is performed by a single-electron transistor. The electrical isolation of this qubit results in a significantly longer coherence time than previous reports for semiconductor charge qubits realized in artificial molecules.