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.
|Number of pages||11|
|Journal||Physical review B: Condensed matter and materials physics|
|Publication status||Published - 7 Jul 2010|
Chirolli, L., Strambini, E., Giovannetti, V., Taddei, F., Piazza, V., Fazio, R., ... Burkard, G. (2010). Electronic implementations of interaction-free measurements. Physical review B: Condensed matter and materials physics, 82(4), 045403. https://doi.org/10.1103/PhysRevB.82.045403