September 28th, 2023 at 16h – Quantum Computing with Molecules

Categories: Events, International Research Seminars, News


Quantum Computing with Molecules

By, Prof. Mario Ruben, INT, IQMT, Karlsruhe Institute of Technology (KIT), Karlsruhe/D and ISIS, CESQ, University of Strasbourg, Strasbourg/F

Date and Venue: September 28th, 2023 at 16h – Aula Magna Enric Casassas (Faculty of Chemistry)

(Chaired by Prof. Guillem Aromí, IN²UB and Faculty of Chemistry)

Abstract:  Metal complexes will be proposed to acting as active quantum units for Quantum Computing (QC). We report on the implementation of metal complexes into nanometre-sized (single-)molecular spintronic devices by a combination of bottom-up self-assembly and top-down lithography techniques. The controlled generation of magnetic molecular nanostructures on conducting surfaces/electrodes will be shown and persistence of their magnetic properties under confinement in Supramolecular Quantum Devices (SMQD) will be proven. The quantum behaviour (e.g.. superposition, entanglement) of the metal complexes will be addressed at the single molecule level1-13 to finally implement a quantum algorithm on a TbPc2 Qudit performing quantum computing  operations.10

Figure 1 Artistic representation of a Molecular Spin Transistor based on a TbPc2 complex acting as a molecular Spin Qudit.8


[1]           S. Kyatskaya et. al. J. Am. Chem. Soc. 2009, 131, 15143-15151.

[2]           M. Urdampilleta et al. Nature Mater. 2011, 10, 502-506.

[3]           J. Schwöbel et. al. Nature Comms. 2012, 3, 953-956.

[4]           R. Vincent et al. Nature 2012, 488, 357-360.

[5]           M. Ganzhorn et al. Nature Nano. 2013, 8, 165–169.

[6]           M. Ruben et. al. Nature Nano. 2013, 8, 377–389.

[7]           S. Wagner et. al. Nature Nano. 2013, 8, 575–579.

[8]           S. Thiele, et al. Science 2014, 344, 1135-1138.

[9]           M. Ganzhorn, et. al. Nature Comms 2016, 7, 11443.

[10]        C. Godfrin et al. PRL 2017, 119, 187702 (perspective article by A. Morello Nature Nano 2018, 13, 9-10).

[11]        H. Biard et. al. Nature Comms 2021, 12, 4443.

[12]        S. Kuppusamy et. al. Nature Comms 2021, 12, 2152.

[13]        D. Serrano et al. Nature 2022, 603, 241.


Recent Reviews:

“Molecular Spin Qudits for Quantum Algorithms.”  Moreno-Pineda, C. Godfrin, F. Balestro, W. Wernsdorfer, M. Ruben. Chem. Soc. Rev. 2018, 47, 501.

Synthetic Engineering of the Hilbert Space of Molecular Qudits: Isotopoloque Chemistry.“  W. Wernsdorfer, M. Ruben. Adv. Mat. 2019, 31, 1806687.