Molecular nanomagnets: a viable path toward quantum information processing?

Molecular nanomagnets: a viable path toward quantum information processing?

5 February 2024 | A Chiesa, P Santini, E Garlatti, F Luis, S Carretta
The paper "Molecular Nanomagnets: A Viable Path Toward Quantum Information Processing?" by A. Chiesa, P. Santini, E. Garlatti, F. Luis, and S. Carretta reviews the potential of molecular nanomagnets (MNMs) as a platform for quantum information processing (QIP). MNMs, which are molecules containing interacting spins, offer a rich playground for quantum mechanics due to their multi-level quantum systems and the ability to engineer their energy spectra. These properties make them promising candidates for encoding quantum information, particularly as qudits, which could simplify algorithms and reduce the overhead of physical qubits in standard multi-qubit codes. The authors highlight several key advantages of MNMs, including their high degree of control in preparing complex supramolecular structures, the possibility of building quantum simulators, and the potential for error-protected logical units within single molecules. They discuss the challenges and recent progress in scaling up the number of qudits/qubits and their individual addressing, as well as experimental techniques such as single-molecule transistors, superconducting devices, and optical readout methods. The paper also explores theoretical proposals and experimental implementations of molecular qubits and quantum gates, emphasizing the qudit approach and its potential for quantum error correction (QEC). It reviews the current state of molecular spin qubits, including their coherence times, manipulation techniques, and multi-qubit structures. The authors discuss the importance of controlling and reading out the spins of single molecules, the development of circuit quantum electrodynamics devices, and the exploitation of chiral-induced spin selectivity (CISS) for molecular spin qubit control. Finally, the paper addresses the main challenges in scaling up the architecture and achieving full experimental exploration, such as single-molecule control and readout, and provides a comprehensive overview of the current state-of-the-art in building a molecular spin quantum processor.The paper "Molecular Nanomagnets: A Viable Path Toward Quantum Information Processing?" by A. Chiesa, P. Santini, E. Garlatti, F. Luis, and S. Carretta reviews the potential of molecular nanomagnets (MNMs) as a platform for quantum information processing (QIP). MNMs, which are molecules containing interacting spins, offer a rich playground for quantum mechanics due to their multi-level quantum systems and the ability to engineer their energy spectra. These properties make them promising candidates for encoding quantum information, particularly as qudits, which could simplify algorithms and reduce the overhead of physical qubits in standard multi-qubit codes. The authors highlight several key advantages of MNMs, including their high degree of control in preparing complex supramolecular structures, the possibility of building quantum simulators, and the potential for error-protected logical units within single molecules. They discuss the challenges and recent progress in scaling up the number of qudits/qubits and their individual addressing, as well as experimental techniques such as single-molecule transistors, superconducting devices, and optical readout methods. The paper also explores theoretical proposals and experimental implementations of molecular qubits and quantum gates, emphasizing the qudit approach and its potential for quantum error correction (QEC). It reviews the current state of molecular spin qubits, including their coherence times, manipulation techniques, and multi-qubit structures. The authors discuss the importance of controlling and reading out the spins of single molecules, the development of circuit quantum electrodynamics devices, and the exploitation of chiral-induced spin selectivity (CISS) for molecular spin qubit control. Finally, the paper addresses the main challenges in scaling up the architecture and achieving full experimental exploration, such as single-molecule control and readout, and provides a comprehensive overview of the current state-of-the-art in building a molecular spin quantum processor.
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