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Visibility-Based Hypothesis Testing Using Higher-Order Optical Interference.

Michał Jachura1, Marcin Jarzyna2, Michał Lipka1

  • 1Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warszawa, Poland.

Physical Review Letters
|March 31, 2018
PubMed
Summary
This summary is machine-generated.

This study demonstrates a new quantum information protocol using higher-order interference for robust optical signal comparison, even without a shared phase reference. Optimal performance is achieved in the few-photon regime, offering a practical primitive for quantum technologies.

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Area of Science:

  • Quantum information science
  • Quantum optics
  • Quantum communication

Background:

  • Quantum information protocols often use optical interference for enhanced efficiency and security.
  • Standard methods require a shared phase reference, limiting practical applications.
  • Higher-order interference offers an alternative approach.

Purpose of the Study:

  • To analyze and demonstrate binary discrimination of visibility hypotheses using higher-order interference.
  • To develop a robust protocol primitive for optical signals with random relative phases.
  • To determine the optimal operating conditions and cost of the protocol.

Main Methods:

  • Theoretical analysis of higher-order interference for binary discrimination.
  • Experimental demonstration of the protocol with optical signals.
  • Quantification of protocol cost by total detected optical energy.

Main Results:

  • Successfully demonstrated binary discrimination of visibility hypotheses using higher-order interference.
  • The protocol operates effectively with random relative phases, eliminating the need for phase locking.
  • Optimal performance is typically achieved in the few-photon regime.

Conclusions:

  • Higher-order interference provides a robust primitive for quantum information protocols when phase locking is impractical.
  • The few-photon regime is optimal for this method, suggesting applications in low-light quantum systems.
  • This work advances practical implementations of quantum information processing.