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Related Experiment Videos

Statistics and noise in a quantum measurement process

Makhlin1, Schon, Shnirman

  • 1Institut fur Theoretische Festkorperphysik, Universitat Karlsruhe, D-76128 Karlsruhe, Germany and Landau Institute for Theoretical Physics, Kosygin street 2, 117940 Moscow, Russia.

Physical Review Letters
|November 18, 2000
PubMed
Summary

We describe quantum measurement using a single-electron transistor, revealing telegraph noise in strong measurement regimes. This work unifies current and charge statistics for broad quantum measurement applications.

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Area of Science:

  • Quantum physics
  • Mesoscopic systems
  • Quantum information science

Background:

  • Quantum measurement is fundamental to quantum information processing.
  • Understanding measurement back-action is crucial for controlling quantum systems.
  • Single-electron transistors (SETs) and quantum point contacts (QPCs) are key tools for probing quantum phenomena.

Purpose of the Study:

  • To develop a unified description of quantum measurement using SETs/QPCs coupled to qubits.
  • To analyze current and charge statistics under strong measurement conditions.
  • To investigate the emergence of telegraph noise in quantum measurements.

Main Methods:

  • Theoretical modeling of a quantum bit coupled to a single-electron transistor or quantum point contact.

Related Experiment Videos

  • Derivation of probability distributions for current and charge.
  • Analysis of noise spectra to identify characteristic behaviors.

    • Main Results:

    • A unified description for quantum measurement statistics in the strong measurement regime was found.
    • Probability distributions for current and charge were derived for different process stages.
    • Telegraph-noise behavior in the current was identified in the strong measurement regime.

    Conclusions:

    • The derived description applies to a wide range of quantum measurement scenarios.
    • Telegraph noise in the current is a detectable signature of strong quantum measurement.
    • This research provides insights into the fundamental process of quantum measurement and its control.