Faculty of Science, Technology and Medicine
Faculty of Law, Economics and Finance
Faculty of Humanities, Education and Social Sciences
Interdisciplinary Centre for Security, Reliability and Trust
Luxembourg Centre for Systems Biomedicine
Luxembourg Centre for Contemporary and Digital History
Luxembourg Centre for European Law
Luxembourg Centre for Socio-Environmental Systems
Measurement induced non-equilibrium problems
Abstract:
In quantum mechanics, the role of an observer is fundamentally different from that of a classical observer. The quantum mechanical observer necessarily plays an active role in the dynamics of the system that it is observing. This apparent difficulty may be turned into a tool to drive an initially trivial system into a complicated quantum many-body state simply by observing it. I will present examples of states induced by measurement. In the first, we examine the role of a moving density measuring device interacting with a system of fermions, and in particular, show that it would leave behind a wake of purely quantum origin. In the second example, inspired by topological Floquet insulators, we will see how a suitably chosen set of density measurements, repeated periodically, will induce robust chiral edge motion of fermions. These examples show how quantum mechanical observation can be added as a versatile tool to the arsenal of quantum engineering in condensed matter systems.
About the speaker:
Professor Israel Klich is a prominent theoretical physicist at the University of Virginia whose work bridges condensed matter theory, mathematical physics, and quantum information. He received his Ph.D. from the Technion – Israel Institute of Technology in 2004, and has since made foundational contributions to the study of entanglement in many-body systems, including the proof of the Widom conjecture for free-fermion entanglement entropy, the introduction of quantum noise as an entanglement meter, and the construction of the Fredkin and Motzkin spin chains exhibiting extensive entanglement. He is also known for influential results on the Casimir effect, full counting statistics, and the stability of topological phases. He is a Fellow of the American Physical Society.
Spring Physics Colloquium will follow a new format:
- The colloquium will take place on Monday, 27 April , at 11:00 AM in room BSC 2.01 in the Bâtiment des Sciences at Campus Limpertsberg;
- Before the colloquium, we warmly invite you to a coffee break at 10:30 AM in the meeting room BSC 0.01 of the Bâtiment des Sciences. This is a great opportunity to engage with Prof. Israel Klich and connect with fellow attendees over a nice coffee break. For logistics purposes, please register by Friday, 24 April, using the Coffee registration link below;
- Attendance in person is preferred. If you are unable to join us in person, you can still participate in the event remotely through the Webex link provided below. Meeting number (access code): 2782 806 6572; Meeting password: DgnYiy2kp96.