Speaker
Description
In recent years we have shown, that molecular Lanthanide-based coordination complexes hold potential for use as physical supports for the implementation of single- and entangled-qubit quantum gates in Quantum Information Technology devices [1,2]. The coupled electronic qubit-nuclear qudit nature of this system allowed to propose a scheme for intrinsic implementation of efficient quantum error correction schemes [2]. Further, the multifrequency single crystal c.w.- and pulse EPR spectra of Gd(trensal), allowed to establish that vanishing angular orbital momentum results in decoherence suppression [3]. In addition, dipolar-interaction-coupled Yb(III) sites were exploited for the experimental demonstration of entangled-qubit gates [4]. Finally, very recently, we demonstrated the first ever implementation of a quantum simulation on molecular magnetic materials [5].
Recently we probed the fundamental factors that induce decoherence in ensembles of molecular magnetic materials [6]. This was done by pulse Electron Paramagetic Resonance measurements at X-band ($\sim9.6$ GHz) on single crystals of Gd$\\@$Y(trensal) at $0.5$, $10^{-1}$ , $10^{-2}$ and $10^{-3}$ $\%$ doping levels. At the lowest dilution level of $10^{-3}$ $\%$, and under dynamic decoupling conditions, the ratio of $T_m$ versus the time it takes to implement a quantum gate, $T_G$, reaches the order of $10^4$, in the example of a single qubit $\pi$-rotation, which corresponds to a gate fidelity of $99.99$ $\%$.
Acknowledgements
We thank the Novo Nordisk Foundation for research grants NNF20OC0065610 and NNF21OC0068806.
References
[1] K. S. Pedersen et al., “Toward Molecular 4f Single-Ion Magnet Qubits,” Journal of the American Chemical Society, vol. 138, no. 18. American Chemical Society (ACS), pp. 5801–5804, Apr. 27, 2016. https://doi.org/10.1021/jacs.6b02702
[2] R. Hussain et al., “Coherent Manipulation of a Molecular Ln-Based Nuclear Qudit Coupled to an Electron Qubit,” Journal of the American Chemical Society, vol. 140, no. 31. American Chemical Society (ACS), pp. 9814–9818, Jul. 24, 2018. https://doi.org/10.1021/jacs.8b05934
[3] C. D. Buch et al., “Spin–Lattice Relaxation Decoherence Suppression in Vanishing Orbital Angular Momentum Qubits,” Journal of the American Chemical Society, vol. 144, no. 38. American Chemical Society (ACS), pp. 17597–17603, Sep. 15, 2022. https://doi.org/10.1021/jacs.2c07057
[4] B. E. Bode et al., “Dipolar-Coupled Entangled Molecular 4f Qubits,” Journal of the American Chemical Society, vol. 145, no. 5. American Chemical Society (ACS), pp. 2877–2883, Jan. 25, 2023. https://doi.org/10.1021/jacs.2c10902
[5] S. Chicco et al., “Proof-of-Concept Quantum Simulator Based on Molecular Spin Qudits,” Journal of the American Chemical Society, vol. 146, no. 1. American Chemical Society (ACS), pp. 1053–1061, Dec. 26, 2023. https://doi.org/10.1021/jacs.3c12008
[6] S. H. Hansen et al., “Probing decoherence in molecular 4f qubits,” Chemical Science, vol. 15, no. 48. Royal Society of Chemistry (RSC), pp. 20328–20337, 2024. https://doi.org/10.1039/d4sc05304d
