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Entangled Photon Spectroscopy.

Audrey Eshun1, Oleg Varnavski1, Juan P Villabona-Monsalve1

  • 1Department of Chemistry, University of Michigan, 930 North UniversityAnn Arbor, Michigan 48103, United States.

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Chemists can now use entangled light for advanced spectroscopy, imaging, and sensing. This quantum approach enables highly sensitive measurements and unprecedented low-light microscopy, pushing the boundaries of chemical analysis.

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Area of Science:

  • Quantum optics and chemistry
  • Nonclassical light-matter interactions
  • Quantum information science (QIS) applications in chemistry

Background:

  • The second quantum revolution offers new tools for chemical detection and analysis.
  • Research in quantum phenomena has advanced, particularly in understanding nonclassical light interactions with matter.
  • Entangled and squeezed states of light have been generated and studied for over two decades.

Purpose of the Study:

  • To discuss the application of entangled light in spectroscopy, microscopy, and interferometry for chemical research.
  • To highlight the potential benefits and new avenues opened by quantum light in chemistry.
  • To showcase advancements in measuring entangled photon absorption cross-sections and their molecular applications.

Main Methods:

  • Generation of photon-number squeezed states of light via multiphoton absorption.
  • Utilizing entangled photons for spectroscopy, including measurements of entangled two-photon absorption cross-sections in biological systems.
  • Development and implementation of a quantum-entangled photon-excited microscope for low-excitation intensity imaging.
  • Application of quantum interferometry with entangled photons, specifically using a Hong-Ou-Mandel interferometer, combined with molecular spectroscopy.

Main Results:

  • Demonstrated the usefulness of entangled light for spectroscopy through experiments on porphyrin dendrimers and flavoproteins.
  • Achieved unprecedented low excitation intensity (10^7 photons/s) in entangled two-photon microscopy, significantly lower than classical methods.
  • Measured entangled photon cross-sections in organic chromophores, impacting applications like entangled two-photon microscopy.
  • Showcased the sensitivity of Hong-Ou-Mandel interferometry to organic samples and its potential for obtaining parameters like dephasing time.

Conclusions:

  • Entangled light provides new control knobs for manipulating molecular excited states.
  • Quantum-entangled photon microscopy offers significant advantages in sensitivity and low-light imaging.
  • Quantum interferometry with entangled photons presents new opportunities for precise chemical measurements and advanced phenomenology.