Quantum coherent control of a hybrid superconducting circuit made with graphene-based van der Waals heterostructures

TL;DR

This paper demonstrates quantum coherence and control in a superconducting circuit with graphene-based Josephson junctions, enabling a voltage-tunable transmon qubit and opening new avenues for quantum computing and material studies.

Contribution

It introduces a superconducting circuit with graphene-based Josephson junctions that exhibits quantum coherence and can function as a tunable qubit, integrating vdW materials into quantum circuits.

Findings

Successful demonstration of quantum coherence in graphene-based Josephson junctions.

Operation of the device as a voltage-tunable transmon qubit.

Potential for studying vdW materials using microwave photons in quantum circuits.

Abstract

Quantum coherence and control is foundational to the science and engineering of quantum systems. In van der Waals (vdW) materials, the collective coherent behavior of carriers has been probed successfully by transport measurements. However, temporal coherence and control, as exemplified by manipulating a single quantum degree of freedom, remains to be verified. Here we demonstrate such coherence and control of a superconducting circuit incorporating graphene-based Josephson junctions. Furthermore, we show that this device can be operated as a voltage-tunable transmon qubit, whose spectrum reflects the electronic properties of massless Dirac fermions traveling ballistically. In addition to the potential for advancing extensible quantum computing technology, our results represent a new approach to studying vdW materials using microwave photons in coherent quantum circuits.