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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Published on: May 30, 2014

Quantum capacities of bosonic channels.

Michael M Wolf1, David Pérez-García, Geza Giedke

  • 1Max-Planck-Institute for Quantum Optics, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany.

Physical Review Letters
|May 16, 2007
PubMed
Summary

We determined the quantum capacity for bosonic quantum channels, proving Gaussian encodings are optimal for optical fibers. This allows calculating transmission rates for any channel using measurable parameters.

Area of Science:

  • Quantum Information Science
  • Quantum Communication
  • Quantum Optics

Background:

  • Bosonic quantum channels are crucial for transmitting quantum information.
  • Understanding their capacity is essential for developing quantum technologies.
  • Previous work lacked general methods for arbitrary channels.

Purpose of the Study:

  • To investigate and calculate the quantum capacity of bosonic quantum channels.
  • To determine the optimality of Gaussian encodings for specific channel types.
  • To develop a method for estimating achievable transmission rates for arbitrary channels.

Main Methods:

  • Calculating quantum capacity for Gaussian channels.
  • Proving the optimality of Gaussian encodings.

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  • Demonstrating asymptotic simulation of arbitrary channels by Gaussian channels.
  • Characterizing degradable Gaussian channels and those from teleportation protocols.

    • Main Results:

    • Gaussian encodings are proven optimal for a class of Gaussian channels, including those with photon loss.
    • Achievable quantum information transmission rates for arbitrary channels can be determined from measurable parameters.
    • A complete characterization of degradable Gaussian channels and those from teleportation is provided.

    Conclusions:

    • The study provides a robust framework for quantifying quantum information transmission in bosonic channels.
    • The findings are applicable to real-world scenarios like optical fiber communication.
    • This work advances the theoretical understanding and practical application of quantum channel capacity.