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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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Light-Activated Qubit Coupling in a Vanadyl Porphyrin Trimer.

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Researchers developed a molecular system for quantum information science. Photoexcitation triggers ultrafast interactions between molecular qubits, enabling light-activated quantum gates at room temperature.

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Area of Science:

  • Quantum information science
  • Molecular quantum computing
  • Spin dynamics in molecules

Background:

  • Molecules offer a tunable platform for quantum information science.
  • Advances in optical spin initialization, control, and readout of molecular qubits have been achieved.
  • A key challenge is creating scalable architectures via controlled interqubit interactions.

Purpose of the Study:

  • To present a molecular system for optically controlled interqubit interactions.
  • To demonstrate ultrafast coupling of magnetically independent molecular qubits upon photoexcitation.
  • To provide a proof of concept for light-activated molecular quantum gates.

Main Methods:

  • Utilized a molecular system of two vanadyl porphyrin qubits bridged by a free-base porphyrin.
  • Employed femtosecond transient absorption and time-resolved electron paramagnetic resonance (TREPR) spectroscopy.
  • Performed DFT calculations and spectral simulations for theoretical support.

Main Results:

  • Photoexcitation induced coupling between qubits via a spin-quintet state formation within subpicosecond timescales.
  • Observed long-lived spin polarization persisting up to room temperature.
  • Demonstrated optically controlled spin interactions in molecules.

Conclusions:

  • The presented molecular system enables ultrafast, light-activated interqubit interactions.
  • This mechanism is a crucial step towards scalable molecular quantum computing architectures.
  • The findings pave the way for developing novel light-activated molecular quantum gates.