# Entangling Spins in Double Quantum Dots and Majorana Bound States

## TL;DR

This paper explores coupling mechanisms between double quantum dot singlet-triplet qubits and Majorana bound states, proposing methods for readout, gate operations, and scalable quantum computing architectures.

## Contribution

It introduces a hybrid system combining singlet-triplet and topological qubits, enabling improved readout and gate operations for fault-tolerant quantum computing.

## Key findings

- Demonstrates singlet-triplet qubit can read out Majorana qubit
- Proposes hybrid network for scalable quantum computing
- Extends setup to multiple qubits for fault tolerance

## Abstract

We study the coupling between a singlet-triplet qubit realized in a double quantum dot to a topological qubit realized by spatially well-separated Majorana bound states. We demonstrate that the singlet-triplet qubit can be leveraged for readout of the topological qubit and for supplementing the gate operations that cannot be performed by braiding of Majorana bound states. Furthermore, we extend our setup to a network of singlet-triplet and topological hybrid qubits that paves the way to scalable fault-tolerant quantum computing.