Universität zu Köln

Manousakis, J., Wille, C., Altland, A., Egger, R., Flensberg, K. and Hassler, F. (2020). Weak Measurement Protocols for Majorana Bound State Identification. Phys. Rev. Lett., 124 (9). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Manousakis, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wille, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Altland, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Egger, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Flensberg, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hassler, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-341650
DOI:	10.1103/PhysRevLett.124.096801
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	124
Number:	9
Date:	2020
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1079-7114
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TOPOLOGICAL SUPERCONDUCTIVITY; FERMIONS; JUNCTIONS; NOISE Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/34165