Characterizations of complex systems and untrusted devices for quantum simulations, computing and networks

Quantum technologies including quantum simulation, computing and networks are at the heart of many academic projects and strategic developments of multinational companies. These efforts have already led to impressive experimental progress. Devices for quantum randomness generation or quantum key distribution have been commercially available since 2004 and various companies are now proposing small to medium scale quantum computers for solving specific tasks. 
How can one test these devices? How can one be assured of their proper functioning? Fully dismantling the device to investigate all of its components comes at the price of voiding any manufacturer warranty. Furthermore the physics of these devices can be complex, so getting a complete and precise model of these devices to describe their behavior can be challenging. 
During this talk, we will discuss how to interact with complex systems or untrusted devices to characterize them. We will present concrete ideas to prove the quantum nature of many-body systems without assumption on the dimension of the underlying Hilbert space or on the proper calibration of the measurement devices. We will show how one can certify the proper functioning of building blocks of quantum computers and networks independently of the details of the actual implementation. 
 
About the research of the speaker: https://www.physik.unibas.ch/personen/prof-sangouard-snsf.html