Coupling electron to microwave photons for advanced quantum technologies

15:15   Inaugural Lecture Prof. Mitali Banerjee
16:05  Inaugural Lecture Prof. Pasquale Scarlino

Semiconductor qubits rely on controlling the charge and spin degrees of freedom of electrons or holes confined in quantum dots.
As semiconductor qubit-qubit coupling is typically short-ranged, the distance between interacting qubits must not exceed the extent of the wavefunction of the confined particles mediating said coupling (a few hundred nanometers). After reviewing the state of the art of the experimental effort in building a spin qubit quantum processor, a novel method for potentially scaling up spin qubits is presented, inspired by techniques initially developed for circuit QED. In particular, I will show how to achieve the strong coupling limit between individual electrons confined in semiconducting quantum dots and microwave photons confined in high-impedance superconducting resonators.
Indeed, promoting interactions within quantum systems with distinct degrees of freedom will enable us to create unique, more sophisticated, and yet versatile devices paving the way for the investigation of light-matter interaction at the fundamental level in novel and unconventional régimes, and opening new venues for applications in quantum information technology.

Biography
Pasquale Scarlino obtained his master's degree in Physics at the University of Salento, Lecce (Italy), in February 2011. He received his Ph.D. in Physics in February 2016 under the supervision of Prof. L.M.K. Vandersypen in the Quantum Transport Group at TU Delft. He contributed to the first realization and control of a spin qubit defined in a Silicon quantum well. He underwent post-doctoral training in Prof. A. Wallraff's group at ETH Zurich, where he worked on integrating semiconductor and superconductor technologies. Here, he pioneered microwave-photon-mediated strong coupling between charge and spin qubits in semiconductor devices. From June 2019 to October 2020, he worked as a Senior Researcher at Microsoft Station Q and the Center for Quantum Devices in Copenhagen, focusing on semiconductor-superconducting hybrid hardware for topologically protected quantum computation. Since November 2020, he has been a tenure track Assistant Professor of Physics in the School of Basic Sciences at the EPFL, where he founded the Hybrid Quantum Circuit (HQC) laboratory.