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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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Testing Higher-Order Quantum Interference with Many-Particle States.

Marc-Oliver Pleinert1,2, Alfredo Rueda1, Eric Lutz3

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Summary
This summary is machine-generated.

Researchers explored higher-order quantum interference beyond single particles. Using a two-photon setup, they observed two-particle interference up to fourth order, setting new bounds for quantum mechanics.

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Area of Science:

  • Quantum Physics
  • Quantum Optics
  • Many-Body Quantum Systems

Background:

  • Quantum mechanics allows interference between indistinguishable paths, but typically limits it to second order for single particles.
  • Previous experimental searches for higher-order interference focused on single-particle interference schemes.

Purpose of the Study:

  • To experimentally investigate many-particle higher-order interference.
  • To explore interference phenomena beyond the limitations of single-particle interference.

Main Methods:

  • Utilized a novel two-photon-five-slit experimental setup.
  • Analyzed interference patterns in both intensity-correlation and photon-correlation regimes.

Main Results:

  • Observed non-zero two-particle interference extending to the fourth order.
  • Demonstrated that fifth-order interference is suppressed, with bounds of 10⁻³ in intensity correlations and 10⁻² in photon correlations.

Conclusions:

  • Many-particle systems allow for higher-order interference than previously demonstrated with single-particle systems.
  • The study provides new experimental bounds on higher-order quantum interference, advancing our understanding of quantum correlations.