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• W202927013 abstract "This thesis presents measurements of classical and quantum noise in nano circuits.The first part of the thesis, covers extensive measurements on charge noise sources. Low-frequency charge noise with the power spectrum close to 1/f(wherefis thefrequency) has been observed in a variety of systems. Despite the large theoreticaland experimental efforts during the past three decades, the origin of this noise is stillunknown. One of the best platforms to study this noise is the single electron transistor(SET) which is extremely sensitive to charge. We have exploited this unique chargesensitivity to probe the charge noise sources.We have measured the temperature and the bias dependence of the charge noiseand concluded that the two-level fluctuators (TLFs) which cause the charge noisehave a temperature which is closer to the temperature of the electrons on the SETrather than to the temperature of the phonos underneath the SET. This suggests thatmost probably the charge noise sources are in the vicinity of the SET and can ther-malize with SET electrons through quantum tunneling which limits their distributionto within a few nanometers around the SET. In another set of measurements, we have probed the TLFs when they are pushedout of equilibrium by an external electric field. The relaxation process of the TLFscauses a charge drift which we have measured using a SET over four decades of time.We found that this drift is logarithmic in time and by comparing it to theory we couldextract the density of TLFs. Studying how the drift depends on temperature andelectric field, we can also conclude that the switching of the TLFs is due to quantumtunneling and not due to thermal activation. The second part of the thesis covers experiments related to vacuum fluctuations.Vacuum fluctuations are one of the most interesting predictions of the quantum me-chanics. We have demonstrated the first observation of the dynamical Casimir effect,which is generation of real photons out of the vacuum by modulation of a mirrorat relativistic speeds. We show broad band generation of photons and demonstratetwo-mode squeezing of this radiation. In another experiment, we have measured thestrength of these vacuum fluctuations by using an artificial atom in front of a mirroras our quantum probe. In the last part of the thesis, we present preliminary results forcharacterization of the system consisting of two artificial atoms in front of a mirror, asystem which can potentially exploited for studying the interaction of artificial atomsthrough exchange of photons." @default.
• W202927013 created "2016-06-24" @default.
• W202927013 creator A5078031125 @default.
• W202927013 date "2014-01-01" @default.
• W202927013 modified "2023-09-26" @default.
• W202927013 title "Probing quantum and classical noise in nano circuits" @default.
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