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Related Experiment Videos

Fidelity and coherence measures from interference.

Daniel K L Oi1, Johan Aberg

  • 1Centre for Quantum Computation, Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, United Kingdom.

Physical Review Letters
|December 13, 2006
PubMed
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Single particle interferometry measures quantum state coherence by interference visibility. This method probes locality and correlations of quantum processes, distinguishing them beyond direct state analysis.

Area of Science:

  • Quantum mechanics
  • Quantum information science
  • Quantum optics

Background:

  • Quantum state coherence is crucial for quantum information processing.
  • Interference visibility in interferometry is a key measure of coherence.
  • Distinguishing quantum processes often requires advanced techniques beyond simple state measurement.

Purpose of the Study:

  • To define interferometric measures for probing locality and correlation properties of quantum processes.
  • To utilize single particle interferometry to quantify the fidelity and coherence of quantum states.
  • To differentiate quantum processes that are indistinguishable by direct process tomography.

Main Methods:

  • Utilizing single particle interferometry to analyze quantum state interference.

Related Experiment Videos

  • Preparing particles in specific quantum states (rho_A, rho_B) in different interferometer paths.
  • Analyzing the maximal interference visibility as a function of interferometer choice and preparation locality.

    • Main Results:

    • Maximal interference visibility depends on the interferometer and preparation locality, but fundamentally on the quantum states themselves.
    • Interferometric measures can probe non-local properties of quantum preparations.
    • The proposed measures can distinguish between quantum processes that direct process tomography cannot.

    Conclusions:

    • Interference visibility in single particle interferometry provides a robust measure of quantum state coherence and process properties.
    • This approach offers a novel way to investigate correlations and locality in quantum systems.
    • Interferometric measures extend the capabilities of quantum process characterization beyond internal state analysis.