Master Topics

Study of molecular quantum bits by high-frequency electron paramagnetic resonance

       The use of spin properties for quantum computation has promising applications because the superposition of quantum states enables faster information processing. In this case, the classic binary digit (bit) is replaced by a so-called quantum bit (qubit). The coherence time of a spin state is an essential property and also a challenge in this research field since it determines the applicability of a given spin system as a qubit. Molecular spins are a widely explored for qubits due to the possibility of chemically engineer their properties by changing organic ligands around the central metal atom. This work aims at characterization of new molecular magnetic materials such as cobalt and copper complexes using high-frequency electron paramagnetic resonance (HF-EPR) spectroscopy. This tool enables direct observation of spin transitions, and the simulation of EPR absorption spectra provides molecular magnetic parameters and relaxation times. The search for molecular qubits with long coherence time is the crucial for the future generation of qubits.

Literature:

  1. GAITA-ARIÑO, A. a S. HILL, L. and CORONADO, E., Molecular spins for quantum computation, Nat. Chem. 2019, 11, 301–309, DOI: 10.1038/s41557-019-0232-y.
  2. GRINBERG, Oleg a Lawrence J. BERLINER. Very High Frequency (VHF) ESR/EPR. 1st edition. New York: Springer Science Business Media, 2004. ISBN 978-144-1934-420.
  3. WEIL, John A. a James R. BOLTON. Electron paramagnetic resonance: elementary theory and practical applications. 2nd edition. Hoboken: Wiley-Interscience, 2007. ISBN 978-0-471-75496-1.
  4. NEUGEBAUER, P., D. BLOOS, R. MARX, et al. Ultra-broadband EPR spectroscopy in field and frequency domains. Physical Chemistry Chemical Physics. 2018, 20(22), 15528-15534. DOI: 10.1039/C7CP07443C. ISSN 1463-9076.

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