Electronic implementations of Interaction-Free Measurements

Details Electronic implementations of Interaction-Free Measurements Electronic implementations of Interaction-Free Measurements

2010-04-12

arxiv.org/abs/1004.1895v1

Phys. Rev. B 82, 045403 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 10 figures

Scientific paper

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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