CPM Seminar

From electron shot noise to quantum optics

Bertrand Reulet

Université de Sherbrooke

Electronic noise, the current fluctuations generated by electrons in a conductor, can be seen either as electrons being particles crossing randomly the conductor, or as random electromagnetic fields generated by that conductor. We will discuss these two aspects in a quantum conductor, a tunnel junction at ultra-low temperature. We will first discuss an experiment where we demonstrate that electrons try to cross the sample at a regular pace fixed by the voltage. In a second experiment we will analyze the radiated electromagnetic field in terms of quantum optics, and show evidence of quadrature squeezing and entanglement, proving the quantum nature of that radiation.