Noise-Induced Phase Transition in the Electronic Mach-Zehnder Interferometer | Zendy

Ivan P. Levkivskyi | Zendy; Eugene V. Sukhorukov | Zendy

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Noise-Induced Phase Transition in the Electronic Mach-Zehnder Interferometer

Author(s) -

Ivan P. Levkivskyi,

Eugene V. Sukhorukov

Publication year - 2009

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.103.036801

Subject(s) - dephasing , physics , interferometry , mach–zehnder interferometer , quantum point contact , biasing , noise (video) , quantum noise , phase noise , condensed matter physics , voltage , quantum , optics , quantum mechanics , quantum well , laser , artificial intelligence , computer science , image (mathematics)

We consider dephasing in the electronic Mach-Zehnder interferometer strongly coupled to current noise created by a voltage biased quantum point contact (QPC). We find the visibility of Aharonov-Bohm oscillations as a function of voltage bias and express it via the cumulant generating function of noise. In the large-bias regime, high-order cumulants of current add up to cancel the dilution effect of a QPC. This leads to an abrupt change in the dependence of the visibility on voltage bias which occurs at the QPC’s transparency T=1/2. Quantum fluctuations in the vicinity of this point smear out the sharp transition

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