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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

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Teffanie Goh1, Riddhish Pandharkar1,2, Laura Gagliardi1,2

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This summary is machine-generated.

Molecular qubits are key for quantum tech. Accurate theoretical methods like hybrid MC-PDFT and CASPT2 successfully reproduced essential spin properties (singlet-triplet gap, ZFS) for optically addressable molecular qubits.

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Area of Science:

  • Quantum Information Science
  • Computational Chemistry
  • Materials Science

Background:

  • Molecular electron spin qubits are promising for quantum technologies.
  • Accurate calculation of singlet-triplet gap and zero-field splitting (ZFS) is crucial for qubit viability.
  • These parameters are typically small and challenging for theoretical methods.

Purpose of the Study:

  • To accurately calculate the singlet-triplet gap and ZFS parameters for an optically addressable molecular qubit, (C6F5)3trenVCNBu.
  • To evaluate the performance of various computational methods (CASSCF, CASPT2, MC-PDFT, HMC-PDFT) for these calculations.
  • To investigate the effect of ligand variations on the spin properties of related V3+ complexes.

Main Methods:

  • Complete active space self-consistent field (CASSCF) calculations.
  • Post-CASSCF methods including CASPT2, MC-PDFT, and HMC-PDFT.
  • Ab initio ligand field theory (AILFT) for analyzing ligand influence.

Main Results:

  • Hybrid MC-PDFT (0.5 HMC-PDFT) and CASPT2 methods reproduced singlet-triplet gap and ZFS parameters with reasonable accuracy.
  • Investigated four additional V3+ complexes, finding minimal impact of ligands on molecular spin properties.
  • Proposed these V3+ complexes as potential optically addressable qubit candidates.

Conclusions:

  • Hybrid MC-PDFT and CASPT2 are suitable for accurate theoretical prediction of spin properties in molecular qubits.
  • Ligand choice has a limited effect on the spin properties of these V3+ complexes.
  • The studied V3+ complexes show promise as candidates for molecular qubits in quantum technologies.