Charge and spin state readout of a double quantum dot coupled to a resonator

TL;DR

This paper introduces a non-invasive radio-frequency resonant circuit method for reading out charge and spin states in semiconductor double quantum dots, eliminating the need for separate electrometers.

Contribution

It presents a novel detection scheme that directly couples a resonant circuit to a quantum dot for state measurement, simplifying quantum dot readout processes.

Findings

Successful charge and spin state detection using RF resonant circuit

Demonstration of non-invasive measurement technique

Potential for integrated quantum dot readout systems

Abstract

State readout is a key requirement for a quantum computer. For semiconductor-based qubit devices it is usually accomplished using a separate mesoscopic electrometer. Here we demonstrate a simple detection scheme in which a radio-frequency resonant circuit coupled to a semiconductor double quantum dot is used to probe its charge and spin states. These results demonstrate a new non-invasive technique for measuring charge and spin states in quantum dot systems without requiring a separate mesoscopic detector.