Broad-band spectroscopy of electronuclear spin qudits based on vanadyl porphyrin molecules
ORAL
Abstract
The possibility of encoding several qubits in vanadyl porphyrin molecules hosting a S = 1/2 electronic spin coupled to a I = 7/2 nuclear spin has been explored. A complete study of the spin Hamiltonian and the spin dynamics has been performed via a combination of electron paramagnetic resonance, heat capacity, magnetization and on-chip magnetic spectroscopy experiments performed on single crystals, observing low temperature T2 of micro-seconds and T1 longer than a second. For sufficiently strong magnetic fields (B > 0.1 T, corresponding to resonance frequencies of 9–10 GHz) these properties make vanadyl porphyrin molecules suitable qubit realizations. For lower magnetic fields (B < 0.1 T), and lower frequencies (< 2 GHz), spectroscopic signatures of a sizeable electronuclear entanglement arise. This effect generates a larger set of allowed transitions between different electronuclear spin states and removes their degeneracies. Under these conditions, each molecule fulfils the conditions to act as a universal 4-qubit processor or, equivalently, as a d = 16 qudit. These findings widen the catalogue of chemically designed systems able to implement non-trivial quantum functionalities, such as quantum simulations and quantum error correction at the molecular level.
*This work was supported by funds from the EU (COST Action 15128 MOLSPIN, QUANTERA project SUMO, FET-OPEN grant 862893 FATMOLS), the Spanish MICINN (grants CTQ2015- 68370-P, CTQ2015-64486-R, RTI2018-096075-B-C21, PCI2018- 093116, PGC2018-098630-B-I00, MAT2017-86826-R) and the Gobierno de Aragón (grants E09-17R-Q-MAD, E31_17R PLATON).
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Publication: I. Gimeno, A. Uritzberea, J. Román-Roche, D. Zueco, A. Camón, P. J. Alonso, O. Roubeau and F. Luis. Broad-band spectroscopy of a vandal porphyrin: a model electro nuclear spin qudit. Chemical Science 12, 5621-5630 (2021).
Presenters
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Ignacio Gimeno
- Instituto de Nanociencia y Materiales de Aragón (CSIC-Universidad de Zaragoza)
- Consejo Superior de Investigaciones Cientificas (CSIC) / Universidad de Zaragoza / INMA