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Full polarization control for fiber optical quantum communication systems using polarization encoding.

G B Xavier1, G Vilela de Faria, G P Temporão

  • 1Pontifical Catholic University of Rio de Janeiro - Optoelectronics & Instrumentation Group Center for Telecommunications Studies, Rio de Janeiro, Brazil.

Optics Express
|June 11, 2008
PubMed
Summary
This summary is machine-generated.

This study presents a real-time polarization control system for quantum communication. The novel system achieves precise control of polarization states with minimal impact on quantum channel performance.

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Area of Science:

  • Optical Engineering
  • Quantum Information Science
  • Telecommunications

Background:

  • Maintaining stable polarization states is crucial for high-fidelity quantum information transfer.
  • Existing polarization control methods can introduce penalties or noise, limiting performance.
  • Real-time adaptive control is necessary for dynamic optical environments.

Purpose of the Study:

  • To develop and demonstrate a real-time polarization control system for quantum communication.
  • To investigate the effectiveness of using non-orthogonal reference signals for polarization management.
  • To evaluate the system's performance in terms of speed, accuracy, and impact on quantum channel quality.

Main Methods:

  • A real-time polarization control system was designed using two non-orthogonal reference signals.
  • Reference signals were multiplexed with the data signal in either time or wavelength domains.
  • Polarization controllers were implemented in a closed-loop configuration for adaptive control.
  • Theoretical analysis and experimental validation were performed, focusing on wavelength multiplexing.

Main Results:

  • Complete control over multiple polarization states was theoretically and experimentally achieved.
  • Experimental results demonstrated negligible added penalties, with an average optical Quantum Bit Error Rate (QBER) of 0.044%.
  • The system exhibited response times under 10 milliseconds without significant noise introduction in the quantum channel.

Conclusions:

  • The developed real-time polarization control system effectively manages polarization states in optical communication.
  • The system offers high performance with minimal penalties and noise, suitable for quantum channels.
  • This technology advances the reliability and efficiency of polarization-dependent optical communication systems.