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Area of Science:

  • Quantum physics
  • Quantum information science
  • Quantum optics

Background:

  • Bell inequality violations confirm a system's nonclassical nature.
  • The degree of violation serves as a benchmark for quantum protocol performance.
  • Capturing quantum effects in images demonstrates imaging's potential for quantum information.

Purpose of the Study:

  • To demonstrate the violation of a Bell inequality within observed images.
  • To explore quantum imaging schemes based on Bell inequality violations.
  • To investigate the promise of spatial variables in quantum information schemes.

Main Methods:

  • Acquiring full-field coincidence images.
  • Probing a phase object with photons from an entangled pair source.
  • Analyzing images for Bell inequality violation.

Main Results:

  • Demonstrated a violation of a Bell inequality within observed images.
  • Measured a violation of S = 2.44 ± 0.04.
  • Showcased the ability of images to capture fundamental quantum effects.

Conclusions:

  • The experiment opens avenues for novel quantum imaging schemes.
  • The findings suggest potential for quantum information schemes utilizing spatial variables.
  • Image-based Bell inequality violation provides a new tool in quantum research.