Deposition of an Addressable Molecular Spin Qubit with Built-In Decoupling Structure.

Area of Science:

• Materials Science
• Quantum Computing
• Nanotechnology

Background:

• Next-generation quantum devices require individually addressable magnetic spin qubits.
• Conventional methods use inorganic buffer layers (e.g., MgO) for substrate decoupling, limiting versatility and scalability.
• A molecular design with intrinsic decoupling is needed for advanced quantum architectures.

Purpose of the Study:

• To introduce a heterobimetallic molecular design strategy for integrating molecular spin qubits.
• To demonstrate a single coordination complex with a vanadyl spin center and an inorganic decoupling unit.
• To overcome limitations of external decoupling layers in surface-based quantum device integration.

Main Methods:

• Synthesized and characterized the heterobimetallic lantern complex [PtVO(SOCPh)4] (PtVO).
• Deposited a submonolayer of PtVO on highly oriented pyrolytic graphite using electrospray deposition.
• Employed synchrotron spectroscopies (X-ray absorption, X-ray magnetic circular dichroism) and density functional theory (DFT) calculations.

Main Results:

• Achieved a chemically intact and well-defined molecular interface of PtVO on graphite.
• Demonstrated magnetic isolation of the vanadyl center at the submonolayer limit.
• Provided detailed insights into adsorption geometry, electronic structure, and magnetic anisotropy of PtVO.

Conclusions:

• Established a built-in molecular decoupling system as a viable chemical principle.
• Showcased the potential for scalable integration of addressable molecular spin qubits on low-dimensional materials.
• Paved the way for new surface-based quantum architectures using molecular qubits.