# Fast two-qubit logic with holes in germanium

## TL;DR

This paper demonstrates fast, high-fidelity single and two-qubit operations using holes in germanium quantum dots, highlighting germanium's potential as a scalable platform for quantum computing.

## Contribution

It introduces a germanium-based platform with rapid two-qubit gates and high control, advancing quantum dot qubit technology with minimal disorder and efficient spin-orbit coupling.

## Key findings

- Single-qubit fidelity of 99.3%
- Two-qubit CX gates within 75 ns
- High Rabi frequencies exceeding 100 MHz

## Abstract

The promise of quantum computation with quantum dots has stimulated widespread research. Still, a platform that can combine excellent control with fast and high-fidelity operation is absent. Here, we show single and two-qubit operations based on holes in germanium. A high degree of control over the tunnel coupling and detuning is obtained by exploiting quantum wells with very low disorder and by working in a virtual gate space. Spin-orbit coupling obviates the need for microscopic elements and enables rapid qubit control with Rabi frequencies exceeding 100 MHz and a single-qubit fidelity of 99.3 %. We demonstrate fast two-qubit CX gates executed within 75 ns and minimize decoherence by operating at the charge symmetry point. Planar germanium thus matured within one year from a material that can host quantum dots to a platform enabling two-qubit logic, positioning itself as a unique material to scale up spin qubits for quantum information.