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Interference of quantum channels.

Daniel K L Oi1

  • 1Centre for Quantum Computation, Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, United Kingdom. D.K.L.Oi@damtp.cam.ac.uk

Physical Review Letters
|August 26, 2003
PubMed
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Interferometry can now quantify quantum process coherence. Researchers developed a new measure, coherent fidelity, to assess quantum map coherence and find the nearest unitary process.

Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Quantum Process Theory

Background:

  • Quantum processes are fundamental to quantum computation and information transfer.
  • Characterizing the coherence of quantum operations is crucial for understanding their effectiveness.
  • Completely positive maps are a standard mathematical tool for describing quantum operations.

Purpose of the Study:

  • To introduce a novel interferometric method for characterizing quantum processes.
  • To quantify the coherence of completely positive maps using quantum interference.
  • To develop a measure of coherent fidelity and identify the closest unitary process.

Main Methods:

  • Utilizing interferometry to probe the properties of quantum physical processes.

Related Experiment Videos

  • Deriving a mathematical measure for coherent fidelity based on interference visibility.
  • Applying the derived measure to find the closest unitary operator to a given quantum process.

    • Main Results:

    • Demonstrated that interferometry can effectively characterize quantum process coherence.
    • Introduced a new quantitative measure: coherent fidelity.
    • Established a method to find the closest unitary operator corresponding to a physical process.

    Conclusions:

    • Interferometry provides a powerful tool for analyzing quantum process coherence.
    • The developed coherent fidelity measure offers a new way to assess quantum map quality.
    • The findings contribute to a deeper understanding of quantum information processing and its limitations.