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Updated: May 5, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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An exactly solvable model for quantum communications.

Graeme Smith1, John A Smolin1

  • 1IBM T. J. Watson Research Center, Yorktown Heights, New York 10598, USA.

Nature
|November 19, 2013
PubMed
Summary
This summary is machine-generated.

We developed a solvable quantum model for communication channels, enabling exact calculation of data transmission rates. This quantum information theory advances noisy quantum channel analysis for quantum key distribution and fiber optics.

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Area of Science:

  • Quantum Information Science
  • Communication Theory
  • Quantum Optics

Background:

  • Information theory defines limits for noisy communication systems.
  • Accurate quantum models of devices are often intractable, hindering capacity calculations.
  • Communication capacities remain unknown for many quantum channels, including waveguide transmission.

Purpose of the Study:

  • To develop an exactly solvable model for quantum communication channels.
  • To derive explicit expressions for point-to-point capacities of noisy quantum channels.
  • To extend the theory to quantum communication networks, including broadcast and multiple-access channels.

Main Methods:

  • Developed a communication model incorporating a fully quantum electromagnetic field.
  • Derived exact analytical solutions for communication capacities.
  • Investigated rudimentary quantum network models (broadcast, multiple-access).

Main Results:

  • Provided explicit expressions for all point-to-point capacities of noisy quantum channels.
  • Developed a theory for quantum communication networks.
  • Model predictions align closely (within bits) with the classical Gaussian model.

Conclusions:

  • The presented quantum model offers an exactly solvable approach to communication channel capacity.
  • The findings have direct implications for quantum key distribution and fiber-optic communications.
  • The model simplifies relevant physics for high signal-to-noise scenarios while maintaining accuracy.