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Full counting statistics of spin currents.

Antonio Di Lorenzo1, Yuli V Nazarov

  • 1Department of Nanoscience, Faculty of Applied Sciences, Delft University of Technology, 2628 CJ Delft, The Netherlands.

Physical Review Letters
|August 25, 2004
PubMed
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Researchers explored detecting fluctuating spin currents and electron spin transfer statistics. Measurement outcomes depend on detector quantum dynamics, not just the projection postulate.

Area of Science:

  • Quantum mechanics
  • Condensed matter physics

Background:

  • Spin currents are fundamental to spintronics.
  • Understanding electron spin transfer statistics is crucial for quantum information processing.

Purpose of the Study:

  • To develop methods for detecting fluctuating spin currents.
  • To derive the full counting statistics of electron spin transfers.
  • To investigate the role of detector dynamics in measurement outcomes.

Main Methods:

  • Utilizing multiple detectors in series to monitor spin components.
  • Analyzing measurement outcomes in relation to quantum dynamics.

Main Results:

  • Standard projection postulate is insufficient for explaining measurement statistics.

Related Experiment Videos

  • Full counting statistics are intrinsically linked to the quantum dynamics of the detectors.
  • Conclusions:

    • The quantum dynamics of detectors play a critical role in spin current measurements.
    • New theoretical frameworks are needed to fully describe electron spin transfer statistics.