Packaging for floating charged particles qubits

Amongst the multiple candidates to realize a fully functional quantum computer, one of the promising platform is the implementation of qubits using floating charged particles on the surface of superfluid He or solid Ne [1,2]. To facilitate the implementation of a quantum computer using these platforms, we have developed a new packaging implementing minimal amount of indium seals as well as standard connectors.

In this talk we show initial results obtained on our hermetic packaging designed to be superfluid helium tight to enable operations qubits based on floating charged particles. We show that electrons can be trapped on the surface of the qubit chip implementing the new electron gun PCB developed to interface with our hermetic packaging solution. Furthermore, we will demonstrate that this improved version of the packaging still retains optimal configurations to perform cQED readout experiment, demonstrated on the QCage platform [3].

[1] Koolstra et al., Nature Comm. 10, 5323 (2019)

[2] X. Zhou et al., Nature 20, 116 (2023)

[3]S. Simbierowicz et al., Rev. Sci. Instrum. 94, 054713 (2023)