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Coherent Detection of Electron Dephasing

Tue, 2011-02-22 18:28 - Daniel Rudolph
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Date: 
2010-04-27
Author(s): 

E. Strambini, L. Chirolli, V. Giovannetti, F. Taddei, R. Fazio, V. Piazza, and F. Beltram

Reference: 

Phys. Rev. Lett. 104, 170403 (2010)

URL: 

http://link.aps.org/doi/10.1103/PhysRevLett.104.170403

We show that an Aharonov-Bohm ring with asymmetric electron injection can act as a coherent detector of electron dephasing. The presence of a dephasing source in one of the two arms of a moderately-to-highly asymmetric ring changes the response of the system from total reflection to complete transmission while preserving the coherence of the electrons propagating from the ring, even for strong dephasing. We interpret this phenomenon as an implementation of an interaction-free measurement.