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arXiv · 1004.1895

Electronic implementations of Interaction-Free Measurements

L. Chirolli·E. Strambini·V. Giovannetti·F. Taddei·V. Piazza·R. Fazio·F. Beltram·G. Burkard
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Abstract

Three different implementations of interaction-free measurements (IFMs) in solid-state nanodevices are discussed. The first one is based on a series of concatenated Mach-Zehnder interferometers, in analogy to optical-IFM setups. The second one consists of a single interferometer and concatenation is achieved in the time domain making use of a quantized electron emitter. The third implementation consists of an asymmetric Aharonov-Bohm ring. For all three cases we show that the presence of a dephasing source acting on one arm of the interferometer can be detected without degrading the coherence of the measured current. Electronic implementations of IFMs in nanoelectronics may play a fundamental role as very accurate and noninvasive measuring schemes for quantum devices.

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L. Chirolli, E. Strambini, V. Giovannetti, F. Taddei, V. Piazza, R. Fazio, F. Beltram, G. Burkard. 2010-04-12. Electronic implementations of Interaction-Free Measurements. https://doi.org/10.1103/physrevb.82.045403

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