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Related Experiment Videos

Quantum information becomes classical when distributed to many users.

Giulio Chiribella1, Giacomo Mauro D'Ariano

  • 1QUIT Group, Dipartimento di Fisica A. Volta and INFM, via Bassi 6, 27100 Pavia, Italy. chiribella@fisicavolta.unipv.it

Physical Review Letters
|February 7, 2007
PubMed
Summary
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Physical transformations distributing quantum information can be approximated by classical broadcasting of measurement outcomes. This quantum state estimation method offers an accuracy of O(M(-1)), applicable to quantum cloning.

Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Quantum Communication

Background:

  • Quantum information processing relies on precise state manipulation.
  • Distributing quantum information to multiple users presents significant challenges.
  • Approximating complex quantum transformations is crucial for practical applications.

Purpose of the Study:

  • To investigate the approximation of physical transformations that distribute quantum information.
  • To establish a bound on the accuracy of approximating quantum information distribution.
  • To explore the application of this approximation to quantum cloning.

Main Methods:

  • Analyzing physical transformations that equally distribute quantum information over M users.
  • Developing a classical broadcasting model of measurement outcomes.

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  • Utilizing quantum state estimation techniques.

    • Main Results:

    • Any such transformation can be approximated by classical broadcasting with accuracy at least O(M(-1)).
    • Quantum cloning of pure and mixed states can be approximated using quantum state estimation.
    • For optimal qubit cloning with 10 copies, error probability is p(err) >= 0.45, near random guessing.

    Conclusions:

    • Classical broadcasting of measurement outcomes provides a viable approximation for quantum information distribution.
    • Quantum state estimation is an effective method for approximating quantum cloning.
    • The developed approximation framework has implications for the feasibility of quantum cloning technologies.