Events Daily

Thursday, November 11, 2021
      

How to Avoid HEATED Discussions Among Your Spins
Paola Cappellaro, Massachusetts Institute of Technology
Event Type: Physics Dept Colloquium
Time: 4:00 PM -
Location: 726 Broadway, 940, CCPP Seminar
Abstract:

Quantum devices could perform some informational tasks with much better performances than classical systems, with profound implications for cryptography, chemistry, material science, and many areas of physics. However, to reach this goal we need to control large quantum systems, where the many-body dynamics might scramble the quantum information, heating up the system to its thermal state.

There are then two key questions:

How does a closed quantum system thermalize (thus losing its “quantum power”)?

How can we preserve quantum information in the presence of strong interactions?

Using a nuclear spin chain as an exemplary experimental system, I will show how to choreograph their dynamics in order to prevent the system from heating up, even in the presence of strong interactions among spins. Among the strategies to prevent thermalization, I will focus on Floquet Hamiltonian engineering that can induce prethermalization, a long-lived state that thermalizes only exponentially slowly.