NVision advances molecular qubits
Researchers have designed a molecular qubit with optical readout capabilities, opening a potential route to integration with photonic circuits.
Researchers from NVision Quantum Technologies and Ulm University have developed a molecular qubit that can be individually addressed using light, potentially enabling new approaches to scalable quantum computing based on photonic integrated circuits (PICs).
The research focuses on a specially designed carbene molecule whose fluorescence depends on its electron spin state.
This property enables optical readout at the single-molecule level, addressing a limitation of earlier molecular qubit systems that required measurements averaged across multiple molecules.
The molecule also exhibits spin states that persist long enough to support quantum operations. Its properties can be modified through synthetic chemistry, providing opportunities to optimise performance for different quantum applications.
A key objective is to integrate these molecular qubits with photonic integrated circuits manufactured using established semiconductor foundry processes.
NVision proposes depositing the molecules as thin films onto photonic platforms, allowing optical signals to control and connect individual qubits.
Such an approach could support the development of modular quantum computing architectures in which light provides communication between quantum elements.
Optical connectivity could also help address the challenges of increasing qubit numbers while maintaining precise control and limiting errors.
According to NVision, combining molecular quantum materials with scalable photonic manufacturing could provide a pathway towards quantum processors containing substantially larger numbers of qubits.
The research demonstrates individual molecular qubit addressability, although integration into a functioning PIC-based quantum processor remains a future development goal.
The work highlights the potential of combining molecular engineering with integrated photonics to develop new quantum computing, sensing and communication technologies.
