Working Group Molecular Quantum Systems

Head: Prof. Dr. Mario Ruben

Our research activity at the Karlsruhe Institute of Technology is oriented towards the design of functional nanosystems by state-of-the-art organic/inorganic synthesis and supramolecular self-assembly techniques for their implementation and integration into devices.

A topical focus of our work is the development of coherent spin-photon interfaces for  quantum information processing systems where the spin of rare-earth ions embedded in organic molecules can be operated as a quantum memory that can be switched by light control between different quantum states.

More information



(1)   D. Serrano et al., Ultra-narrow optical linewidths in rare-earth molecular crystals, Nature 603 (2022) 241
(2)   K. S. Kumar et al., Optical Spin-State Polarization in a Binuclear Europium Complex towards Molecule-Based Coherent Light-Spin Interfaces, Nat. Commun. 12 (2021) 2152
(3)   H. Biard et al., Increasing the Hilbert space dimension using a single coupled molecular spin, Nat. Commun. 12 (2021) 4443
(4)   C. Godfrin et al., Operating Quantum States in Single Magnetic Molecules: Implementation of Grover's Quantum Algorithm, Phys. Rev. Lett. 119 (2017) 187702
(5)   R. Vincent et al., Electronic read-out of a single nuclear spin using a molecular spin transistor, Nature 488 (2012) 357
(6)   M. Ruben et al., Grid-Type Metal Ion Architectures: Functional Metallosupramolecular Arrays, Chem. Eur. J. 43 (2004) 3644


Members (in alphabetical order)
Name Tel
Bld.-Room E-Mail
Brachnakova, Barbora barbora brachnakovaGgn9∂kit edu
yaorong chenGgn9∂kit edu
senthil.kuppusamy2Ggn9∂kit edu
patrick lawesGgn9∂kit edu
Molina Jirón de Moreno, Concepcion del Carmen concepcion del carmen molina jirón de morenoGgn9∂kit edu
sai panguluriGgn9∂kit edu
mario rubenGgn9∂kit edu