SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 19: Focus Session: New Perspectives for Adiabatic Demagnetization Refrigeration in the Kelvin and sub-Kelvin Range (joint session TT/MA)
TT 19.1: Hauptvortrag
Dienstag, 28. März 2023, 09:30–10:00, HSZ 03
Self-cooling molecular spin quantum processors — •Marco Evangelisti1, Fernando Luis1, Elias Palacios1, David Aguilà2, and Guillem Aromí2 — 1INMA, CSIC & Universidad de Zaragoza, Spain — 2Dept. Química Inorgànica, Universidad de Barcelona, Spain
Cryogenic refrigeration is crucial for a wide range of emerging applications in the field of quantum technologies. Indeed, thermal energy must be minimized to avoid the excitation of vibrational motions that could disturb quantum operations. Synthetic chemistry provides a sophisticated methodology for the design and synthesis of materials displaying a wide variety of properties. Molecular materials are capable of excellent and unique characteristics that can be exploited either for caloric cooling[1] or spin-based quantum computing[2]. However, these features are not yet being implemented as such to act together within the same material, that is, at the molecular scale. Here, we show that a spin qubit (or qudit) can be brought into proximity with a spin centre that acts as a cooler. To this end, we make use of rare-earth-based asymmetric molecular dimers. A chemically engineered structural asymmetry introduces different coordination environments for each metal ion, operating similarly as for molecular quantum gates reported by some of us[3]. This strategy allows selecting individually both constituent ions, leading to e.g. the direct observation of the cooling of a single Er(III) ion qubit, or a Tm(III) electronuclear spin qudit, driven chiefly by the demagnetization of a single Gd(III) ion located within the same molecule.
[1] Dalton Trans. 39, 4672 (2010)
[2] Nat. Chem. 11, 301 (2019)
[3] Phys. Rev. Lett. 107, 117203 (2011)