Un viaggio nel modo dei quanti, mostre, laboratori, conferenze ed eventi speciali, alla scoperta della meccanica quantistica e della rivoluzione tecnologica che stiamo vivendo.
Museo di Fisica, Università Federico II., Via Mezzocannone, 8, 80134 Napoli NA date: 1-8 aprile 2022 , mattina 9:30-13:30, pomeriggio lunedì e giovedì 14:15-16:30, sabato 9:30-16:30, veberdì 8 aperuta staordinaria fino alle 20:00 con evento speciale. Per Prenotazioni: email@example.com, per maggiori informazioni: 0812535222
Abstract: Noise is most often a disturbance that we would like to get rid of. However, there are fundamental limits to noise determined by physical properties, the laws determining the interaction of an electrical device with its environment. This is equally important for classical and quantum systems, because the later are in reality open systems to some extend that are in constantly exchanging energy with the environment by absorbing or emitting for example microwave photons. The ability to reduce noise to the fundamental limit is important for optimizing sensors and bring them to the highest possible signal-to-noise ratio. Additionally, measuring noise provides insight into how electrons are transmitted in an electrical device. In this talk I will provide a basic introduction into shot noise relevant for nanodevices for which quantum effects are important. While current is a measurement of the mean transmission probability for electrons to pass from source to drain, for example in a channel of a transistor, noise measures the second moment, that is the variance in the distribution function of the transmitted number of electrons. In the experiment, the noise-power spectral density is obtained as a Fourier transform of the autocorrelation function of the current fluctuations. One can expand this type of experiments to cross-correlation experiments which can provide deep insight into correlations in multiterminal devices due to, for example, Coulomb interaction or fancier due to entanglement. I will introduce the Cooper-pair splitter at the end. It is a device that generates pairs of spin-entangled electrons that can be used as a resource for quantum information.