Coherent Detection of Electron Dephasing

Elia Strambini; L. Chirolli; V. Giovanetti; F. Taddei; R. Fazio; V. Piazza

doi:10.1103/PhysRevLett.104.170403

Coherent Detection of Electron Dephasing

Elia Strambini, L. Chirolli, V. Giovanetti, F. Taddei, R. Fazio, V. Piazza

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Abstract

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-tohighly 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.

Original language	English
Pages (from-to)	170403
Number of pages	4
Journal	Physical review letters
Volume	104
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevLett.104.170403
Publication status	Published - Apr 2010

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AU - Strambini, Elia

AU - Chirolli, L.

AU - Giovanetti, V.

AU - Taddei, F.

AU - Fazio, R.

AU - Piazza, V.

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AB - 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-tohighly 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.

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DO - 10.1103/PhysRevLett.104.170403

M3 - Article

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VL - 104

SP - 170403

JO - Physical review letters

JF - Physical review letters

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Coherent Detection of Electron Dephasing

Abstract

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