July 2021

Abstracts of the QSIT Lunch Seminar, Thursday, July 1, 2021

Quantum dots and spin qubits

Andrea Hofmann - previously a PhD student in Klaus Ensslin’s group (ETH Zurich)

I will summarize my research on quantum dots in GaAs heterostructures, which I performed within the scope of QSIT, and which lay the grounds for my subsequent steps. These include spin qubits in Ge heterostructures, a topic that I will eventually resume within the Swiss research network.
 

From circuit quantum electrodynamics to cavity quantum electro-optics

Johannes Fink – previously a PhD student in Andreas Wallraff’s group (ETH Zurich), now PI of the Quantum Integrated Devices laboratory at IST Austria (see also: external pagehttps://quantumids.com/teamcall_made)

While being part of the QSIT community I had the pleasure to give three QSIT talks about some of the most basic cavity QED effects observed in a superconducting circuit at microwave frequencies. After a short summary I plan to give a glimpse into the other Hamiltonian I have dealt with since I left Switzerland, i.e. the one describing the physics of cavity optomechanics. Interestingly, the latter can not only be realized with mechanical elements but also with microwave modes that interact directly with laser light in an electro-optic material. In our group at IST Austria we have recently managed to reach the high cooperativity limit of resonant electro-optics and use it to perform quantum-enabled mode conversion between microwave and optical light.