Events in Physics

Abstract: The talk will have two parts, the first focusing on research on low-temperature multiplexing techniques to allow scale up of the number of quantum devices that can be measured at cryogenic temperatures. In this part I will discuss how we were able to measure 571 quantum constriction devices of varying dimensions using an on-chip multiplexer to better understand the origin of the 0.7(2e²/h) anomalous conductance plateau found close to pinch-off. This allowed us to identify which models best fit the experiments. We modified this device to investigate arrays of exfoliated graphene devices and to also explore arrays of quantum dots. In the second part of the talk, I will discuss our work on high fidelity readout of the spin state of an electron in a quantum dot showing that it can be read out with a fidelity of 99.2% in 5.6us. With the growing achievements in error correction, fast high-quality readout is now needed for quantum computing scale up as the clock speed is limited by the error correction readout time.