Quantum devices typically suffer from decoherence, which is mostly caused by electron-electron scattering, a mechanism that becomes weaker with lower temperatures. Novel quantum states, such as in the fractional quantum Hall regime typically have small energy scales and require ultra-low temperatures for their observation. We discuss how we achieve such temperatures in a dilution fridge and also for electrons in real samples, such as quantum dots.
Dr Klaus Ensslin is a professor of physics at ETH Zurich since 1995 and the Director of the Swiss Centre for Research in Quantum Science and Technology since 2010. He is an expert in the quantum properties of electrons in nanostructures for quantum information processing. Klaus Ensslin studied physics at the University of Munich and at ETH Zurich. After completing his doctoral dissertation at the Max Planck Institute in Stuttgart, he was a postdoc at the University of California in Santa Barbara, USA. In 2020, he was a co-recipient of the Edison Volta prize of the European Physical Society.