Light-Activated Qubit Coupling in a Vanadyl Porphyrin Trimer
Alberto Privitera, Alessandro Chiesa, Fabio Santanni, Davide Ranieri, Prem P. Sahu, Matthew D. Krzyaniak, Andrea Caneschi, Ryan M. Young, Mathias O. Senge, Federico Totti, Michael R. Wasielewski, Stefano Carretta, Roberta Sessoli
TL;DR
This paper introduces a molecular system where light can control quantum interactions, enabling potential quantum computing applications.
Contribution
The novel contribution is a light-activated molecular system that enables ultrafast and controllable qubit coupling.
Findings
Photoexcitation induces a spin-quintet state within subpicosecond timescales.
Long-lived spin polarization is observed even at room temperature.
The system demonstrates optically controlled spin interactions in molecules.
Abstract
Molecules provide a modular and chemically tunable platform for quantum information science. In recent years, significant advances have been made in enabling optical spin initialization, coherent control, and both optical and electrical readout of molecular qubits. Yet, a central challenge remains: realizing scalable architectures through the controlled and ultrafast activation of interqubit interactions. Here, we present a molecular system composed of two vanadyl porphyrin qubits bridged by a free-base porphyrin chromophore, where the qubits are magnetically independent in the ground state but become coupled upon photoexcitation. Femtosecond transient absorption and time-resolved electron paramagnetic resonance experiments, supported by DFT calculations and spectral simulations, reveal that photoexcitation induces the formation of a spin-quintet state within subpicosecond time scales.…
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Taxonomy
TopicsMagnetism in coordination complexes · Synthesis and Properties of Aromatic Compounds · Molecular Junctions and Nanostructures