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Emulating Quantum Entangled Biphoton Spectroscopy Using Classical Light Pulses.

Liwen Ko1,2, Robert L Cook1,2, K Birgitta Whaley1,2

  • 1Department of Chemistry, University of California Berkeley, Berkeley, California 94720, United States.

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|August 31, 2023
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Summary
This summary is machine-generated.

Classical-like coherent states can replace entangled biphotons in quantum light spectroscopy (QLS) experiments, yielding identical signals. This discovery enables quantum-inspired classical experiments and guides future QLS designs for quantum advantage.

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Area of Science:

  • Quantum optics
  • Spectroscopy
  • Quantum nonlinear optics

Background:

  • Quantum light spectroscopy (QLS) utilizes entangled photons for enhanced measurements.
  • Classical light pulses are often used in conjunction with quantum probes.

Purpose of the Study:

  • To demonstrate the equivalence between using entangled biphoton states and classical-like coherent states in QLS.
  • To provide a theoretical framework for designing quantum-inspired classical spectroscopy experiments.

Main Methods:

  • An input-output formulation of quantum nonlinear spectroscopy was employed.
  • Numerical simulations compared classical pump-quantum probe and classical pump-classical probe experiments.

Main Results:

  • Identical spectroscopic signals were obtained by replacing entangled biphotons with classical-like coherent states.
  • The parameters of the biphoton states explicitly define the equivalent classical-like coherent states.

Conclusions:

  • Entangled biphoton probes in QLS can be effectively substituted by carefully designed classical-like coherent states.
  • This equivalence facilitates the development of quantum-inspired classical experiments with equivalent performance.
  • The findings offer insights for designing future QLS experiments aiming for a true quantum advantage.