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This study shows classical interference arises from single-photon self-interference, supporting Born rule tests. It reveals quantum features in bipartite systems by comparing quantum and classical light interference.

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Area of Science:

  • Quantum mechanics
  • Quantum optics
  • Interferometry

Background:

  • Quantum superposition is a fundamental concept in quantum mechanics, crucial for understanding phenomena like self-interference.
  • Single-photon self-interference has been extensively studied in both quantum and classical physics regimes.
  • The Sorkin parameter quantifies the maximum quantum superposition allowed for photons in interferometers.

Purpose of the Study:

  • To investigate the self-interference of attenuated laser light in a quantum regime using a Mach-Zehnder interferometer.
  • To compare the quantum regime results with those of a classical laser light interference.
  • To provide experimental support for Born rule tests and elucidate the origins of classical interference.

Main Methods:

  • Utilizing a Mach-Zehnder interferometer to study light self-interference.
  • Employing attenuated laser light to operate in the quantum regime.
  • Comparing interference patterns generated by single photons with those from classical laser light.

Main Results:

  • The interference pattern of attenuated laser light in the quantum regime was found to be equivalent to its classical counterpart.
  • The experimental results support the validity of Born rule tests.
  • Classical interference patterns were shown to originate from the superposition of individual single-photon self-interferences.

Conclusions:

  • Classical interference phenomena can be understood as the superposition of individual single-photon interference events.
  • This finding reinforces the fundamental principles of quantum mechanics and the Born rule.
  • The study offers insights into the quantum nature of light and bipartite systems.