Conveyor-mode shuttling between quantum dot registers

Great progress has been made in the operation of spin qubits in semiconductor platforms, with high-fidelity control of small qubit registers demonstrated across various systems. A key challenge is now to interconnect such qubit registers, as it may open up scalable modular quantum computing. Shuttling may become the building block of quantum links and promising results have been achieved in silicon and germanium. Here, we focus on conveyor-mode shuttling in germanium and demonstrate the coherent transfer of a single hole spin between two quantum dot arrays spaced 1.2 µm apart. This allows to displace a qubit from a register, through the conveyor, to a remote register. In this talk we will present our efforts in utilizing conveyor-mode shuttling to characterize the underlying device properties and toward shuttling-based quantum computing in germanium.

We acknowledge support by the European Union through the IGNITE project under grant agreement No. 101069515 and QLSI2. This work is part of the 'Quantum Inspire – Dutch Quantum Computer in the Cloud' project (NWA.1292.19.194) funded by the NWO’s NWA program. This research was also supported by the Army Research Office (ARO) under Awards No. W911NF-23-1-0110 and No. W911NF-17-1-0274. The views and conclusions expressed are those of the authors and do not necessarily reflect official ARO or U.S. Government policies. The U.S. Government may reproduce and distribute reprints for Government purposes despite any copyright notation.