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Efficient classical simulation of optical quantum information circuits.

Stephen D Bartlett1, Barry C Sanders

  • 1Department of Physics and Centre for Advanced Computing-Algorithms and Cryptography, Macquarie University, Sydney, NSW 2109, Australia.

Physical Review Letters
|November 22, 2002
PubMed
Summary
This summary is machine-generated.

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Researchers identified physical processes in optical quantum circuits simulatable on classical computers. This finding constrains quantum speedups and nonlinear optical transformations using linear optics and measurement.

Area of Science:

  • Quantum optics
  • Computational physics

Background:

  • Optical quantum circuits are a platform for quantum information processing.
  • Understanding the computational power of these circuits is crucial for quantum technology development.

Purpose of the Study:

  • To identify a class of physical processes in optical quantum circuits that are efficiently simulatable on classical computers.
  • To establish the limits of quantum speedups and nonlinear optical transformations achievable with linear optics and measurement.

Main Methods:

  • Analysis of unitary transformations in optical quantum circuits.
  • Inclusion of amplification, noise, and measurement processes.
  • Investigation of classical feedforward of measurement results.

Main Results:

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  • A broad class of physical processes in optical quantum circuits can be efficiently simulated classically.
  • This includes unitary transformations, amplification, noise, and measurements.
  • The results constrain the potential for exponential quantum speedups.

Conclusions:

  • The identified simulatability imposes limitations on achieving quantum advantage in certain optical quantum computing tasks.
  • Inducing optical nonlinear transformations via linear optics, photodetection, and classical feedforward is constrained.
  • This work clarifies the computational capabilities and limitations of linear optical quantum systems.