Two-qubit Gate of Combined Single Spin Rotation and Inter-dot Spin Exchange in a Double Quantum Dot

TL;DR

This paper demonstrates an all-electrical two-qubit gate using electron spins in a double quantum dot, enabling controlled entanglement crucial for quantum computing.

Contribution

It introduces a novel two-qubit gate combining single spin rotations and inter-dot exchange, advancing the development of universal quantum gates.

Findings

Achieved a partially entangled output state from an uncorrelated initial state.

Controlled entanglement degree via exchange operation time.

Demonstrated a key step towards universal multi-qubit gates.

Abstract

A crucial requirement for quantum information processing is the realization of multiple-qubit quantum gates. Here, we demonstrate an electron spin based all-electrical two-qubit gate consisting of single spin rotations and inter-dot spin exchange in a double quantum dot. A partially entangled output state is obtained by the application of the two-qubit gate to an initial, uncorrelated state. We find that the degree of entanglement is controllable by the exchange operation time. The approach represents a key step towards the realization of universal multiple qubit gates.