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The Uncertainty Principle04:08

The Uncertainty Principle

Werner Heisenberg considered the limits of how accurately one can measure properties of an electron or other microscopic particles. He determined that there is a fundamental limit to how accurately one can measure both a particle’s position and its momentum simultaneously. The more accurate the measurement of the momentum of a particle is known, the less accurate the position at that time is known and vice versa. This is what is now called the Heisenberg uncertainty principle. He mathematically...
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Related Experiment Video

Updated: Jun 10, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Ruling out multi-order interference in quantum mechanics.

Urbasi Sinha1, Christophe Couteau, Thomas Jennewein

  • 1Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada. usinha@iqc.ca

Science (New York, N.Y.)
|July 24, 2010
PubMed
Summary
This summary is machine-generated.

This study tested a key quantum mechanics rule using a three-slit experiment. Results show higher-order interference is negligible, supporting the accuracy of Born

Related Experiment Videos

Last Updated: Jun 10, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Area of Science:

  • Quantum Physics
  • Foundations of Quantum Mechanics

Background:

  • Quantum mechanics and gravitation are fundamental yet incompatible theories in physics.
  • Unification may require generalizing existing theories, potentially violating Born's rule.
  • Born's rule predicts interference from pairs of paths, a cornerstone of quantum mechanics.

Purpose of the Study:

  • To experimentally investigate the possibility of multipath interference beyond pairs of paths.
  • To test the validity of Born's rule in quantum mechanics.
  • To place bounds on higher-order interference phenomena.

Main Methods:

  • Conducted a photon experiment using a three-slit setup.
  • Measured and quantified the contribution of three-path interference.
  • Compared experimental results with predictions from standard quantum mechanics.

Main Results:

  • Bounded the magnitude of three-path interference to less than 10⁻² of two-path interference.
  • Ruled out significant third- and higher-order interference effects.
  • Experiment confirmed consistency with Born's rule in both semiclassical and quantum regimes.

Conclusions:

  • The experiment provides strong evidence against generalized quantum mechanics allowing significant multipath interference.
  • Results set stringent limits on deviations from Born's rule.
  • The findings support the accuracy of the current formulation of quantum mechanics.