Entanglement, dephasing, and phase recovery via cross-correlation measurements of electrons

Determination of the path taken by a quantum particle leads to a suppression of interference and to a classical behavior. We employ here a quantum "which path" detector to perform accurate path determination in a two-path Mach-Zehnder electron interferometer, leading to full suppression of...

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Bibliographic Details
Published inPhysical review letters Vol. 98; no. 3; p. 036803
Main Authors Neder, I, Heiblum, M, Mahalu, D, Umansky, V
Format Journal Article
LanguageEnglish
Published United States 19.01.2007
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Summary:Determination of the path taken by a quantum particle leads to a suppression of interference and to a classical behavior. We employ here a quantum "which path" detector to perform accurate path determination in a two-path Mach-Zehnder electron interferometer, leading to full suppression of the interference. Following the dephasing process we recover the interference by measuring the cross correlation between the interferometer and detector currents. Under our measurement conditions every interfering electron is dephased by approximately a single electron in the detector-leading to mutual entanglement of approximately single pairs of electrons.
ISSN:0031-9007
DOI:10.1103/physrevlett.98.036803