A synthetic two-spin quantum bit: g-engineered exchange-coupled biradical designed for controlled-NOT gate operations

Area of Science:

• Quantum Computing
• Molecular Synthesis
• Spin Chemistry

Background:

• Quantum computing harnesses quantum-mechanical phenomena, such as electron spin, for computation.
• Developing stable and controllable qubit systems is crucial for advancing quantum technologies.

Purpose of the Study:

• To prepare a functional quantum gate using coupled electron spins.
• To demonstrate a molecular system capable of simple quantum computing operations.

Main Methods:

• Synthesis of a specific biradical molecule (biradical 1).
• Co-crystallization of the biradical with an isomorphous host molecule to create a stable system.
• Utilizing the four electron spin states of two weakly exchange-coupled qubits (blue and red).

Main Results:

• Successfully prepared a system of two coupled electron spins acting as a quantum gate.
• The system spans four distinct electron spin states, essential for quantum operations.
• Demonstrated the potential for controlling electron spin transitions for computational purposes.

Conclusions:

• The synthesized biradical system represents a viable approach for creating molecular quantum gates.
• This work contributes to the development of novel quantum computing hardware at the molecular level.