Circuit Quantum ElectroDynamics combines superconducting microwave resonators on a chip with natural or artificial quantum objects. Along this line, spins can strongly interact with cavity electromagnetic fields, giving rise to hybridized spin-photon states with coherent dynamics. We study the coupling and the integration of molecular spin centers and of magnonic materials (e.g., YIG) into planar microwave resonators in order to develop hybrid quantum devices.

Relevant Publications

  • A. Ghirri, M. Cavani, C. Bonizzoni, M. Affronte, Coherent coupling between YBCO superconducting resonators and sub-micrometer-thick YIG films – J. Magn. Magn. Mat. 641, 173859 (2026). https://doi.org/10.1016/j.jmmm.2026.173859
  • C. Bonizzoni, D. Lamberto, S. Napoli, S. Gunzler, D. Rieger, F. Santanni, A. Ghirri, W. Wernsdorfer, S. Savasta, M. Affronte, Observation of perfect absorption in hyperfine levels of molecular spins with hermitian subspaces – Nat. Commun. 17, 470 (2025). https://www.nature.com/articles/s41467-025-67163-z  
  • A. Ghirri, C. Bonizzoni, M. Maksutoglu, M. Affronte, Interplay between magnetism and superconductivity in a hybrid magnon-photon bilayer system – Phys. Rev. Appl. 22, 034004 (2024). https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.22.034004
  • C. Bonizzoni, A. Ghirri, F. Santanni, M. Affronte, Quantum sensing of magnetic fields with molecular spins – npj Quantum Inf. 10, 41 (2024). https://www.nature.com/articles/s41534-024-00838-5
  • A. Ghirri, C. Bonizzoni, M. Maksutoglu, A. Mercurio, O. Di Stefano, S. Savasta, M. Affronte, Ultrastrong Magnon-Photon Coupling Achieved by Magnetic Films in Contact with Superconducting Resonators – Phys. Rev. Appl. 20, 024039 (2023). https://doi.org/10.1103/PhysRevApplied.20.024039
  • C. Bonizzoni, M. Tincani, F. Santanni and M. Affronte, Machine-Learning-Assisted Manipulation and Readout of Molecular Spin Qubits – Phys. Rev. Appl. 18, 064074 (2022). https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.18.064074
  • C. Bonizzoni, M. Maksutoglu, A. Ghirri, J. van Tol, B. Rameev and M. Affronte, Coupling Sub-nanoliter BDPA Organic Radical Spin Ensembles with YBCO Inverse Anapole Resonators – Appl. Magnetic Resonance 2022. https://doi.org/10.1007/s00723-022-01505-8
  • F. Moro, M. Moret, A. Ghirri, A. Granados del Águila, Y. Kubozono, L. Beverina and Antonio Cassinese, Room-temperature optically detected magnetic resonance of triplet excitons in a pentacene-doped picene single crystal – J. Materials Research 37, 1269 (2022). https://doi.org/10.1557/s43578-022-00536-y . See also: Cover Image
  • C. Bonizzoni, A. Ghirri, S. Nakazawa, S. Nishida, K. Sato, T. Takui and M. Affronte, Transmission Spectroscopy of Molecular Spin Ensembles in the Dispersive Regime – Adv. Quantum Technol. 4, 2100039. https://doi.org/10.1002/qute.202100039
  • C. Bonizzoni, A. Ghirri, F. Santanni, M. Atzori, L. Sorace, R. Sessoli and M. Affronte, Storage and retrieval of microwave pulses with Molecular Spin Ensembles – npj Quantum Inf. 6, 68 (2020). https://doi.org/10.1038/s41534-020-00296-9
  • A. Ghirri, C. Herrero, S. Mazérat, T. Mallah, O. Moze and M. Affronte, Coupling Nanostructured CsNiCr Prussian Blue Analogue to Resonant Microwave Fields – Adv. Quantum Technol. 3, 1900101 (2020). https://doi.org/10.1002/qute.201900101
  • C. Bonizzoni, A. Ghirri and M. Affronte, Coherent coupling of molecular spins with microwave photons in planar superconducting resonators – Adv. Phys.-X, 3, 1435305 (2018). https://doi.org/10.1080/23746149.2018.1435305
  • C. Bonizzoni, F. Troiani, A. Ghirri and M. Affronte, Microwave dual-mode resonators for coherent spin-photon coupling – J. Appl Phys. 124, 194501 (2018). https://doi.org/10.1063/1.5050869
  • C. Bonizzoni, A. Ghirri, M. Atzori, L. Sorace, R. Sessoli and M. Affronte, Coherent coupling between Vanadyl Phthalocyanine spin ensemble and microwave photons: towards integration of molecular spin qubits into quantum circuits – Sci. Rep. 7, 13096 (2017). https://doi.org/10.1038/s41598-017-13271-w
  • C. Bonizzoni, A. Ghirri, K. Bader, J. Van Slageren, M. Perfetti, L. Sorace, Y. Lan, O. Fuhr, M. Ruben and M. Affronte, Coupling molecular spin centers to microwave planar resonators: towards integration of molecular qubits in quantum circuits – Dalton Trans. 45, 16596 (2016). https://doi.org/10.1039/C6DT01953F
  • A. Ghirri, C. Bonizzoni, F. Troiani, N. Buccheri, L. Beverina, A. Cassinese, M. Affronte, Coherently coupling distinct spin ensembles through a high-Tc superconducting resonator – Phys. Rev. A, 93, 063855 (2016). https://doi.org/10.1103/PhysRevA.93.063855
  • A. Ghirri, C. Bonizzoni, D. Gerace, S. Sanna, A. Cassinese and M. Affronte, YBa2Cu3O7 microwave resonators for strong collective coupling with spin ensembles – Appl. Phys. Lett. 106, 184101 (2015). https://doi.org/10.1063/1.4920930

Related Projects

Keywords

Magnetism – Molecular Spins – Microwave – Resonators – Coherent coupling – Cirquit QED – Spectroscopy – Spin Resonance – Magnonics