suspended CVD graphene
A fellowship for an experimental PhD thesis work is now available in the Nano- and Quantum Electronics group at the Department of Physics of the University of Basel: www.nanoelectronics.ch
We are partner in a FET-open project, funded by the European Commission. The partners come from Budapest, CEA-Saclay, Copenhagen, Delft, Madrid, and Pisa.
It is our goal is to establish the foundations of a radically new solid state platform for scalable quantum computation, based on Andreev qubits. This platform is implemented by utilizing the discrete superconducting quasiparticle levels (Andreev levels) that appear in weak links between superconductors. Each Andreev level can be occupied by zero, one, or two electrons. The even occupation manifold defines the first type of Andreev qubit, while the odd occupation state gives rise to a second type of qubit, the Andreev spin qubit (ASQ), with an unprecedented functionality: a direct coupling between a single localized spin and the supercurrent across the weak link. We will investigate the so far unexplored ASQ as a spin qubit that is intimately coupled to superconducting circuits. The Andreev qubits shall be implemented in semiconducting nanowire (NWs) based Josephson junctions. In these devices, we can tune the qubit frequency by electrostatic gating, which brings the required flexibility and scalability to this platform. We will demonstrate single- and two-qubit control of Andreev qubits, and benchmark the results against established scalable solid-state quantum technologies. Further information on the definition of an Andreev spin qubit, as well as the current state-of-the-art in the Schönenberger lab can be found in the subsequent figure.
We look for a highly motivated student (preferably a physicist) who is keen to explore fundamental aspects of quantum devices. You will design and fabricate your own devices using state-of-the-art micro- and nanofabrication technologies. The nanowires will be grown by a collaborator, but you will be involved in the future designs and characterizations not limited to electrical measurements. Electric measurements, on which you will focus on, will be done down to millikelvin temperatures and include DC to up to 6 GHz radio-frequency techniques based on modern cryogenic circuitry (for example rf-resonators) and cold amplifiers.
All PhD fellows are expected to work in a team and collaborate with other PhD and postdoctoral fellows, as well as bachelor and master students joining the lab part of their time. Start of the project: Jan-May 2019. Duration 3-4 years. Requirement: you need to have a profound understanding of quantum and solid state physics as it is taught in a physics curriculum.
To apply, please email to Christian.Schoenenberger@unibas.ch a short curriculum vitae including names and contact info of referees and scanned copies of grades. Please add a written statement on your motivation and your education / background in quantum physics and solid-state physics.