Molecular spin qudits to test generalized Bell inequalities
Year: 2026
Authors: Macedonio S., Lepori L., Chiesa A., Chicco S., Bersani L., Rubin-Osanz M., Woodcock L.B., Mavromagoulos A., Allodi G., Garlatti E., Piligkos S., Smerzi A., Carretta S.
Autors Affiliation: Univ Parma, Dipartimento Sci Matematiche Fis & Informat, Parco Area Delle Sci 7 A, I-43124 Parma, Italy; INFN, Sez Milano Bicocca, Grp Collegato Parma, I-43124 Parma, Italy; UdR Parma, INSTM, I-43124 Parma, Italy; Univ Copenhagen, Dept Chem, DK-2100 Copenhagen, Denmark; QSTAR, Largo Enr Fermi 2, I-50125 Florence, Italy; CNR, INO, Largo Enr Fermi 2, I-50125 Florence, Italy; LENS, Largo Enr Fermi 2, I-50125 Florence, Italy.
Abstract: We show that molecular nanomagnets provide an ideal platform to investigate entanglement in qubit-qudit and qudit-qudit pairs. A prototypical example is 173Yb (trensal), embedding an electronic spin qubit coupled to a nuclear spin qudit. We demonstrate violation of generalized Bell inequalities on this molecule by developing an optimized pulse sequence and by performing realistic numerical simulations using experimentally measured Hamiltonian parameters and coherence times. We find that the inequalities are safely violated in a wide range of parameters, proving the robustness of entanglement in the investigated system. Furthermore, we propose a scheme to study qudit-qudit entanglement on a molecular spin trimer, in which two spins 3/2 are linked via an interposed switch to turn on and off their mutual interaction.
Journal/Review: PHYSICAL REVIEW RESEARCH
Volume: 8 (1) Pages from: 13138-1 to: 13138-8
More Information: The authors are pleased to thank J.A. Casas and P. Santini for fruitful discussions. This work received financial support from the European Union-NextGenerationEU, PNRR MUR Project No. PE0000023-NQSTI. We also thank the Novo Nordisk Foundation for research Grant NNF21OC0070832 Exploratory Interdisciplinary Synergy Programme.KeyWords: Python Framework; Quantum; Dynamics; QutipDOI: 10.1103/sn37-b9rr
