Prof. Mordehai Heiblum, Braun Center for Submicron Research,
Weizmann Institute 

Date: Jan. 7, 2007

Title: Controlled Dephasing and Phase Recovery via Cross-Correlation
Measurements of Electrons

Abstract:

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 only 1-3 detector's electrons.