This PhD project is part of a National Centre of Competence in Research (NCCR), named “Spin”, recently selected by the Swiss NSF. This long-term project aims to advance semiconductor-based spin-qubits to a level where quantum-error correction can be demonstrated. It starts with single and two qubit gates and will evolve to a network of qubits that interact via photonic quantum busses.

The fellowship will take part in a dynamic network of researchers with collaborators from IBM, ETHZ and EPFL. The current project will first focus on circuit-QED with single spin-qubits, i.e. the interaction of a single electron or hole spin in a quantum dot defined in a semiconductor that couples via spin-orbit interaction to the photon field of a microwave resonator. Specifically, we will start with qubits defined in GeSi-nanowires. Next, qubit-qubit coupling shall be demonstrated. The vision is to define single spin-qubits directly embedded in a microwave stripline as shown in the artistic view above.

 

(a,b) GeSi core-shell nanowire with bottom-gates allowing to define a quantum dot electrostatically. The gate-fields also enable to tune the spin-orbit interaction, which is crucial when multiple quantum dots are attached to a single photon cavity. (c) shows a l/2-resonator (the fine line) realized in a superconducting film of NbTiN with a zoom in (c) showing single semiconducting nanowire devices (see also inset).

We are looking 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 tailored nanowires and state-of-the-art micro- and nanofabrication.
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 1st of August 2020 or earlier. 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 Schönenberger your curriculum vitae including names and contact info of referees and scanned copies of University grades. Please submit a motivation letter, in which you explain why this position is what you were looking for, why you are eager to perform experimental lab work and why you are convinced that a PhD is the right step for you. You should also dwell on your background in solid-state physics and quantum science. I expect that you have a decent background in experimental research, you have excellent grades in solid-state physics, quantum physics and quantum optics. Experience in electrical transport measurement at low temperature are an advantage.