Detecting the Universal Fractional Entropy of Majorana Zero Modes

Eran Sela, Yuval Oreg, Stephan Plugge, Nikolaus Hartman, Silvia Lüscher, Joshua Folk

Research output: Contribution to journalArticlepeer-review

Abstract

A pair of Majorana zero modes (MZMs) constitutes a nonlocal qubit whose entropy is log2. Upon strongly coupling one of the constituent MZMs to a reservoir with a continuous density of states, a universal entropy change of 12log2 is expected to be observed across an intermediate temperature plateau. We adapt the entropy-measurement scheme that was the basis of a recent experiment by Hartman et al. [Nat. Phys. 14, 1083 (2018)10.1038/s41567-018-0250-5] to the case of a proximitized topological system hosting MZMs and propose a method to measure this 12log2 entropy change - an unambiguous signature of the nonlocal nature of the topological state. This approach offers an experimental strategy to distinguish MZMs from non topological states.

Original languageEnglish
Article number147702
JournalPhysical Review Letters
Volume123
Issue number14
DOIs
StatePublished - 2019

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