Missions

The goal of the research is to investigate the dynamical properties of helical Andreev qubits, i.e. qubits based on two level systems made from the ground and excited Andreev levels of a Josephson junction built with 1D helical states, found at the edges of 2D topological insulators or on the hinges of second order 3D topological insulators.

Activities

The researcher will develop a high frequency probe of these helical Andreev states. To this end, an ac-SQUID with the helical conductor as a week link will be coupled to a resonator and probed with high frequency techniques such as two-tone spectroscopy and time-resolved techniques, to implement the coherent manipulation of the helical Andreev states.

Skills

micro and nanofabrication
quantum circuit fabrication
Quantum bit manipulation

Work Context

The Solid State Physics Laboratory is a joint research unit (UMR 8502) of the University of Paris-Saclay and the CNRS. It is affiliated with the CNRS Institute of Physics and the 28th section of the National Council of Universities. The LPS is a member of the Friedel-Jacquinot Federation, the physics coordination structure on the Moulon plateau in Orsay (IdF).
It brings together around a hundred researchers and teacher-researchers, experimentalists and theorists, and the research activity is supported by around sixty engineers, technicians and administrative staff.
The laboratory welcomes a large number of undergraduate and graduate students each year, including many doctoral students, as well as postdoctoral researchers and visiting scientists. The lab covers a wider variety of topics than its name suggests, and aims to address the full diversity of condensed matter physics. Research activity is organized around three main axes, each of which involves approximately the same number of scientists:
• New electronic states of matter
• Physical phenomena with reduced dimensions
• Soft matter and physics-biology interface
In the first axis are grouped both experimental and theoretical studies relating to the properties of systems in which electronic correlations are generally strong and which are seats of remarkable properties and unconventional electronic states such as superconductivity, magnetism, transitions metal-insulator etc.
In the second are activities relating to “nanosciences” in the broad sense. They are approached here from the point of view of fundamental properties, when the dimensions of an object become as small as certain characteristic distances (coherence length, mean free path, etc.).
The third axis extends the concept of “soft matter” to biological systems. The themes therefore range from complex systems to living tissues, from liquid crystals to foams, including polymers or granular systems. These physical studies are at the interface with physico-chemistry and biology.
The research work will be carried out within the Mesoscopic Physics group of the Solid State Physics Laboratory (CNRS-UMR 8502). This research project benefits from funding from PEPR RobustsuperQ, part of the Quantum Plan.

The position is located in a sector under the protection of scientific and technical potential (PPST), and therefore requires, in accordance with the regulations, that your arrival is authorized by the competent authority of the MESR.