# Low-Error Operation of Spin Qubits with Superexchange Coupling

## TL;DR

This theoretical study explores superexchange interactions between spin qubits in quantum dots, identifying conditions for noise-insensitive operations and controllable interaction signs, advancing quantum dot qubit control.

## Contribution

It introduces the concept of super sweet spots for superexchange, enabling low-error qubit operations insensitive to charge noise and spin-orbit errors.

## Key findings

- Existence of super sweet spots for superexchange
- Superexchange sign can be controlled by energy detuning
- Potential for high-fidelity spin qubit operations

## Abstract

In this theoretical work we investigate superexchange, as a means of indirect exchange interaction between two single electron spin qubits, each embedded in a single semiconductor quantum dot (QD). The exchange interaction is mediated by an intermediate, empty QD. Our findings suggest the existence of first order "super sweet spots", in which the qubit operations implemented by superexchange interaction are simultaneously insensitive to charge noise and errors due to spin-orbit interaction. We also find that the sign of the superexchange can be changed by varying the energy detunings between the QDs.