Hybrid Quantum Systems: Coupling Single-Molecule Magnet Qudits with Industrial Silicon Spin Qubits

• URL: http://arxiv.org/abs/2510.10110v1
• Date: Sat, 11 Oct 2025 08:41:04 GMT
• Title: Hybrid Quantum Systems: Coupling Single-Molecule Magnet Qudits with Industrial Silicon Spin Qubits
• Authors: Daniel Schroller, Daniel Sitter, Thomas Koch, Viktor Adam, Noah Glaeser, Clement Godfrin, Stefan Kubicek, Julien Jussot, Roger Loo, Yosuke Shimura, Danny Wan, Yaorong Chen, Mario Ruben, Kristiaan De Greve, Wolfgang Wernsdorfer,
• Abstract summary: Terbium bis(phthalocyaninato) (TbPc$$) exemplifies such systems.<n>In hybrid quantum memories, TbPc$$ can act as the primary memory element, with semiconductor qubits providing readout and coupling.<n>We present a step toward such a hybrid system: using an industrially manufactured silicon metal-oxide-semiconductor (SiMOS) spin qubit to detect electronic spin transitions of an ensemble of TbPc$$ molecules.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Molecular spin qudits offer an attractive platform for quantum memory, combining long coherence times with rich multi-level spin structures. Terbium bis(phthalocyaninato) (TbPc$_2$) exemplifies such systems, with demonstrated quantum control and chemical reproducibility. In hybrid quantum architectures, TbPc$_2$ can act as the primary memory element, with semiconductor qubits providing scalable readout and coupling. Here we present a step toward such a hybrid system: using an industrially manufactured silicon metal-oxide-semiconductor (SiMOS) spin qubit to detect electronic spin transitions of an ensemble of TbPc$_2$ molecules. The readout is based on a compact and robust protocol that applies a microwave pulse while all gate voltages defining the qubit are held at a fixed operating point. This protocol, which combines simultaneous Rapid adiabatic Passage and Spin- Selective tunneling (RPSS), enables high-contrast resonance detection and avoids repeated $\pi$-pulse recalibration common in decoupling schemes. By demonstrating ensemble detection, we establish a foundation for integrating molecular quantum memories with industrial qubit platforms and mark an important step toward single-molecule hybrid quantum technologies.

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