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Related Experiment Videos

Lower bound for electron spin entanglement from beam splitter current correlations.

Guido Burkard1, Daniel Loss

  • 1IBM T. J. Watson Research Center, P.O. Box 218, Yorktown Heights, NY 10598, USA.

Physical Review Letters
|October 4, 2003
PubMed
Summary

Researchers established a method to measure electron spin entanglement in conductors using current noise. This technique allows experimental determination of entanglement and spin relaxation/decoherence times.

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Area of Science:

  • Quantum Information Science
  • Condensed Matter Physics
  • Spintronics

Background:

  • Entanglement is a key quantum resource.
  • Measuring entanglement in solid-state systems is challenging.
  • Electron spins in conductors offer a platform for quantum information processing.

Purpose of the Study:

  • To determine a lower bound for entanglement of formation for electron spin pairs.
  • To relate entanglement to experimentally measurable quantities like current noise.
  • To investigate the impact of spin relaxation and decoherence on entanglement.

Main Methods:

  • Calculating a lower bound for entanglement of formation.
  • Utilizing zero-frequency current correlators (shot noise, cross correlators).

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  • Incorporating spin relaxation (T1) and decoherence (T2) using Bloch theory.
  • Analyzing the effect of inhomogeneous magnetic fields and thermal mixing.

    • Main Results:

    • A lower bound for entanglement can be expressed via measurable current noise.
    • Spin relaxation and decoherence effects on entanglement are quantified.
    • Entanglement of arbitrary states can be bounded using magnetic fields.
    • Thermal mixing leads to a decrease in entanglement.

    Conclusions:

    • Current correlators provide an experimental route to quantify electron spin entanglement.
    • The method allows for the determination of both entanglement and spin decoherence/relaxation times.
    • This work offers a practical approach for verifying entanglement in spintronic devices.