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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Asking photons where they have been.

A Danan1, D Farfurnik1, S Bar-Ad1

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Photons do not follow single trajectories through interferometers, challenging common interpretations of quantum experiments. This finding is explained by the two-state vector formalism, offering new insights into quantum reality.

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Area of Science:

  • Quantum mechanics
  • Quantum optics
  • Experimental physics

Background:

  • Understanding photon behavior in interferometers is crucial for quantum information science.
  • Previous experiments often assume single trajectories, potentially misinterpreting quantum phenomena.
  • The nature of quantum trajectories remains a subject of debate and investigation.

Purpose of the Study:

  • To experimentally investigate the trajectories of photons within an interferometer.
  • To challenge the conventional understanding of photon paths in quantum measurements.
  • To explore the applicability of the two-state vector formalism in explaining experimental results.

Main Methods:

  • Utilizing an interferometer setup to guide photons.
  • Analyzing signal modulations at mirror vibration frequencies to retrieve path information.
  • Comparing experimental findings with predictions from the two-state vector formalism.

Main Results:

  • Experimental evidence suggests photons do not traverse single, continuous trajectories.
  • Information about photon positions was successfully retrieved from subtle signal modulations.
  • A 'common sense' analysis yielding single trajectories was contrasted with experimental data.

Conclusions:

  • The past of photons is not characterized by simple, continuous trajectories.
  • The two-state vector formalism provides a coherent explanation for the observed experimental results.
  • This study offers a novel perspective on quantum measurement and the nature of quantum reality.