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Título: | Broad-band spectroscopy of a vanadyl porphyrin: a model electronuclear spin qudit |
Autor: | Gimeno, Ignacio CSIC ORCID; Urtizberea, Ainhoa CSIC ORCID; Román-Roche, Juan CSIC ORCID; Zueco, David CSIC ORCID; Camón, Agustín CSIC ORCID ; Alonso, Pablo J. CSIC ORCID; Roubeau, Olivier CSIC ORCID; Luis, Fernando CSIC ORCID | Fecha de publicación: | 2021 | Editor: | Royal Society of Chemistry (UK) | Citación: | Chemical Science 12(15): 5621-5630 (2021) | Resumen: | We explore how to encode more than a qubit in vanadyl porphyrin molecules hosting a S = 1/2 electronic spin coupled to a I = 7/2 nuclear spin. The spin Hamiltonian and its parameters, as well as the spin dynamics, have been determined via a combination of electron paramagnetic resonance, heat capacity, magnetization and on-chip magnetic spectroscopy experiments performed on single crystals. We find low temperature spin coherence times of micro-seconds and spin relaxation times 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. The presence of multiple equispaced nuclear spin levels then merely provides 8 alternatives to define the ‘1’ and ‘0’ basis states. For lower magnetic fields (B < 0.1 T), and lower frequencies (<2 GHz), we find spectroscopic signatures of a sizeable electronuclear entanglement. This effect generates a larger set of allowed transitions between different electronuclear spin states and removes their degeneracies. Under these conditions, we show that each molecule fulfills 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, especially, quantum error correction at the molecular level. | Versión del editor: | https://doi.org/10.1039/D1SC00564B | URI: | http://hdl.handle.net/10261/265488 | DOI: | https://doi.org/10.1039/D1SC00564B | E-ISSN: | 2041-6539 |
Aparece en las colecciones: | (INMA) Artículos |
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