Sophie Hermans

Quantum Networks Using Single Rare‐Earth Ions

Abstract: A future quantum internet will enable fundamentally new applications such as secure communication, distributed quantum computing, and quantum-enhanced metrology and sensing. Recently, a rudimentary quantum network hosting multiple nodes has been demonstrated. However, challenges in scaling up this network motivate the further development of different qubit platforms, such as trapped ions and atoms, and solid-state emitters. Qubits based on single rare-earth ions (REIs) are promising candidates; they exhibit good qubit and optical properties due to their internal atomic structure. Auxiliary qubits are offered in the form of nuclear spins present in the host material. In the Faraon lab, we have recently established distributed entanglement of two and subsequently three qubits, across two nodes. In this seminar, I will discuss ongoing projects: extending the auxiliary qubit control and understanding the noise processes limiting the REI qubit coherence. Additionally, I will outline the future research directions for my lab in Delft: exploring different host materials, developing robust and scalable nanofabrication methods for more elaborate REI-based devices, and investigating two-REI-qubit interactions.