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Noise thresholds for optical quantum computers.

Christopher M Dawson1, Henry L Haselgrove, Michael A Nielsen

  • 1School of Physical Sciences, The University of Queensland, Queensland 4072, Australia.

Physical Review Letters
|February 21, 2006
PubMed
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This study numerically investigates the fault-tolerant threshold for optical cluster-state quantum computing. Scalable quantum computing is achievable with photon loss probabilities below 3 x 10^-3 and depolarization below 10^-4.

Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Optical Quantum Technologies

Background:

  • Optical cluster-state quantum computing offers a promising route to scalable quantum computation.
  • Noise, particularly photon loss and local depolarization, poses a significant challenge to achieving fault tolerance.

Purpose of the Study:

  • To numerically determine the fault-tolerant threshold for optical cluster-state quantum computing.
  • To identify the acceptable noise levels for scalable quantum computation using photons.

Main Methods:

  • Numerical investigation of fault-tolerant thresholds.
  • Modeling of photon loss and depolarizing noise in optical quantum computing architectures.

Main Results:

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  • A threshold region for pairs of photon loss and depolarization probabilities was obtained.
  • Photon loss probabilities below 3 x 10^-3 are permissible.
  • Depolarization probabilities below 10^-4 are permissible for scalable quantum computing.

    • Conclusions:

    • Scalable optical quantum computing is feasible within the identified noise parameter space.
    • The results provide crucial benchmarks for designing robust optical quantum computers.
    • This work contributes to understanding the practical limitations and possibilities of photonic quantum computation.