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Witnessing Genuine Multiphoton Indistinguishability.

Daniel J Brod1, Ernesto F Galvão1, Niko Viggianiello2

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Researchers developed a method using linear interferometers to detect n-boson indistinguishability, crucial for quantum computing. This practical tool quantifies multi-boson indistinguishability, advancing quantum source assessment and fundamental physics.

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Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Fundamental Physics

Background:

  • Bosonic interference is key to quantum computational advantage.
  • Assessing quantum sources and fundamental phenomena requires reliable methods to witness bosonic interference.
  • Quantifying multi-boson indistinguishability is essential for these assessments.

Purpose of the Study:

  • To develop a practical method for unambiguously witnessing genuine n-boson indistinguishability.
  • To bound the degree of multi-boson indistinguishability using a novel set theory model.
  • To experimentally validate the method for three-photon indistinguishability.

Main Methods:

  • Utilizing linear interferometers to create and test for n-boson indistinguishability.
  • Developing a witness that bounds the degree of multi-boson indistinguishability.
  • Employing a novel intuitive model based on set theory.
  • Experimental implementation using parametric down-conversion to generate three-photon states.

Main Results:

  • Demonstrated a method to unambiguously witness genuine n-boson indistinguishability.
  • Quantified the degree of three-photon indistinguishability in experimentally prepared states.
  • The violation of the proposed witnesses provides a bound on multi-boson indistinguishability.

Conclusions:

  • Linear interferometers offer a practical tool for assessing quantum sources and fundamental physics.
  • The developed approach provides a quantitative measure of multi-boson indistinguishability.
  • This work advances photonic applications and inspires further research in operational quantum frameworks.