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Area of Science:

  • Quantum sensing
  • Materials science
  • Spectroscopy

Background:

  • Coherence-based sensing is challenged by energetic disorder from fluctuating liquid environments.
  • A protected quantum subspace with weak environmental interaction is needed to overcome these fluctuations.
  • Lanthanide complexes are promising for quantum applications but often suffer from environmental decoherence.

Purpose of the Study:

  • To develop a molecular system that overcomes environmental fluctuations for precise quantum sensing.
  • To demonstrate an
  • atomlike molecular sensor
  • (ALMS) capable of ultra-narrow spectral linewidths.
  • To explore the potential of ligand protection in lanthanide complexes for enhancing quantum coherence.

Main Methods:

  • Synthesis of a novel ytterbium complex.
  • Measurement of absorption linewidths in solution at room temperature.
  • Spectral hole burning experiments at low temperatures (77 K).
  • Low-field magnetic circular dichroism (MCD) measurements at room temperature.

Main Results:

  • The ytterbium complex exhibited an ultra-narrow absorption linewidth of 0.625 meV at room temperature.
  • Spectral hole burning revealed an even narrower linewidth of 410 peV at 77 K.
  • The narrow linewidths enabled room-temperature, low-field MCD for sensing Earth-scale magnetic fields.
  • Ligand protection significantly reduced electronic state fluctuations in the lanthanide complex.

Conclusions:

  • Ligand protection is an effective strategy to minimize electronic state fluctuations in lanthanide complexes.
  • The developed atomlike molecular sensor (ALMS) demonstrates unprecedented spectral resolution for molecular systems.
  • ALMS shows significant potential for highly sensitive magnetic field detection and other quantum sensing applications.