Weak Measurement Protocols for Majorana Bound State Identification

We propose a continuous weak measurement protocol testing the nonlocality of Majorana bound states through current shot noise correlations. The experimental setup contains a topological superconductor island with three normal-conducting leads weakly coupled to different Majorana states. Putting one...

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Bibliographic Details
Published in:Physical review letters 2020-03, Vol.124 (9), p.096801-096801, Article 096801
Main Authors: Manousakis, J, Wille, C, Altland, A, Egger, R, Flensberg, K, Hassler, F
Format: Article
Language:English
Subjects:
Braiding
Correlation analysis
Heine, Heinrich (1797-1856)
Noise
Noise levels
Noise measurement
Noise monitoring
Qubits (quantum computing)
Shot noise
Topological superconductors
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Summary:We propose a continuous weak measurement protocol testing the nonlocality of Majorana bound states through current shot noise correlations. The experimental setup contains a topological superconductor island with three normal-conducting leads weakly coupled to different Majorana states. Putting one lead at finite voltage and measuring the shot noise correlations between the other two (grounded) leads, devices with true Majorana states are distinguished from those without by strong current correlations. The presence of true Majorana states manifests itself in unusually high noise levels or the near absence of noise, depending on the chosen device configuration. Monitoring the noise statistics amounts to a weak continuous measurement of the Majorana qubit and yields information similar to that of a full braiding protocol, but at much lower experimental effort. Our theory can be adapted to different platforms and should allow for the clear identification of Majorana states.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.124.096801