PhD fellowship

100%, start from 1st April 2019 on

PhD fellowship on Andreev qubits for scalable quantum computation
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
It is our goal is to establish the foundations of a new solid state platform for quantum computation based on Andreev qubits . The Andreev qubit makes use of the discrete quasiparticle state, known as Andreev bound state that appear in weak links between two 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 hybrid 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 and benchmark the results against established scalable solid-state quantum technologies.
We are partner in a FET-open project, funded by the European Commission, on Andreev qubits. The partners come from Budapest, CEA-Saclay, Copenhagen, Delft, Madrid, and Pisa.

Your position
You will design and fabricate your own hybrid nanowire devices with superconducting contacts and circuitry 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, will be done down to millikelvin temperatures and include DC to up to 6 GHz radio-frequency techniques based on modern cryogenic circuitry,
such as rf-resonators and cold amplifiers.

Your profile
We look for a highly motivated student (preferably a physicist) who is keen to explore fundamental aspects of quantum devices. You should have a dedication for experimental work in the field of quantum science and technology and be ready to collaborate and share your knowledge and experience in a team. We expect a strong dedication and commitment to push the frontiers of experimental physics. Requirement: you need to have a profound understanding of quantum and solid state physics as it is taught in a physics curriculum.

We offer you
We offer state-of-the art infrastructure, a maximum of 4 years funding at a standard PhD salary level as published by the Swiss National Science Foundation. We provide excellent support and supervision and we are a highly motivated team.

Application / Contact
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 statement on your motivation and your education / background in quantum physics and
solid-state physics.


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