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Weak Measurement Protocols for Majorana Bound State Identification.

J Manousakis1,2, C Wille3, A Altland1

  • 1Institut für theoretische Physik, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany.

Physical Review Letters
|March 24, 2020
PubMed
Summary
This summary is machine-generated.

We present a new method to detect Majorana bound states using current shot noise. This technique distinguishes true Majorana states from artifacts by analyzing noise correlations, offering a simpler alternative to braiding protocols.

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Area of Science:

  • Condensed matter physics
  • Quantum computing

Background:

  • Majorana bound states are exotic quasiparticles with potential applications in topological quantum computing.
  • Detecting and verifying Majorana bound states is crucial for advancing this field.

Purpose of the Study:

  • To propose and theoretically validate a continuous weak measurement protocol for testing the nonlocality of Majorana bound states.
  • To offer a more experimentally accessible method for identifying Majorana states compared to existing techniques.

Main Methods:

  • Utilizing current shot noise correlations in a topological superconductor island with three normal-conducting leads.
  • Applying a finite voltage to one lead and measuring noise correlations between the other two grounded leads.
  • Analyzing noise statistics to distinguish devices with true Majorana states from those without.

Main Results:

  • Strong current correlations are predicted to distinguish devices with true Majorana states.
  • The presence of Majorana states is indicated by unusually high or near-absent noise levels, depending on device configuration.
  • The proposed weak measurement yields information comparable to full braiding protocols with significantly reduced experimental effort.

Conclusions:

  • The continuous weak measurement protocol provides a viable and efficient method for identifying Majorana bound states.
  • This approach is adaptable to various experimental platforms, facilitating the clear identification of Majorana states.