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E Strambini1, L Chirolli, V Giovannetti

  • 1NEST, Scuola Normale Superiore and Istituto Nanoscienze-CNR, Piazza dei Cavalieri, 7, I-56126 Pisa, Italy. e.strambini@sns.it

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An asymmetric Aharonov-Bohm ring detects electron dephasing by switching from reflection to transmission. This method preserves electron coherence, demonstrating a novel interaction-free measurement technique.

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Area of Science:

  • Quantum mechanics
  • Condensed matter physics
  • Nanoscale electronics

Background:

  • Aharonov-Bohm rings are fundamental in quantum interference studies.
  • Electron dephasing limits quantum device performance.
  • Detecting dephasing without destroying coherence is challenging.

Purpose of the Study:

  • To demonstrate a coherent detector for electron dephasing.
  • To investigate asymmetric Aharonov-Bohm rings for dephasing detection.
  • To explore the link between dephasing and interaction-free measurements.

Main Methods:

  • Utilizing an asymmetric Aharonov-Bohm ring setup.
  • Introducing a dephasing source in one ring arm.
  • Analyzing the system's transmission and reflection properties.
  • Monitoring electron coherence preservation.

Main Results:

  • Asymmetric rings show a switch from total reflection to complete transmission upon dephasing.
  • Coherence of propagating electrons is maintained even under strong dephasing.
  • The observed phenomenon aligns with interaction-free measurement principles.

Conclusions:

  • Asymmetric Aharonov-Bohm rings function as effective coherent dephasing detectors.
  • This approach offers a method for dephasing detection while preserving quantum coherence.
  • The findings suggest a practical implementation of interaction-free measurements in electron transport.