Vedika Khemani, Stanford
Many-Body Physics in the NISQ Era
A central goal of condensed matter physics is to study the universal emergent properties of macroscopic quantum systems with large numbers of interacting particles. Due to a variety of conceptual and experimentally motivated reasons, the traditional approach of many-body physics is largely built around the study of low-temperature and near-equilibrium properties of time independent Hamiltonians.
A confluence of developments across a range of subfields --- particularly experimental advances in building Noisy Intermediate-Scale Quantum (NISQ) devices --- have opened up a vast new territory of studying many-body phenomena in completely novel regimes: highly excited, "post Hamiltonian", and far from equilibrium. The natural evolutions implemented by these novel experiments are dynamics generated by quantum circuits of unitary gates, possibly interrupted by measurements, and starting from initial states that are not low energy in any useful sense. These platforms present an opportunity to explore vastly larger tracts of Hilbert space that are normally hard to reach. They also present new ways to interrogate a quantum system to probe complex quantum correlations, for instance, via an interactive dialog with a classical experimenter.
I will describe some highlights of an active research program to advance many-body theory beyond the regime of near-equilibrium time-independent Hamiltonians, with a view towards uncovering novel emergent phenomena in the non-equilibrium dynamics of many-body systems and the physics of (possibly interactive) quantum circuits.
Vedika Khemani is an assistant professor of physics at Stanford University. After completing her Ph.D. at Princeton in 2016, she did her postdoctoral work as a Junior Fellow at Harvard. She is a recipient of an Alfred P. Sloan Fellowship, a DOE Early Career Award, the William L. McMillan Award, an APS George E. Valley Jr. Prize, the Breakthrough New Horizons in Physics Prize and a Packard Fellowship in Science and Engineering.
This event will be virtual only.
https://ucsb.zoom.us/j/84217234934?pwd=Nk4ya1NLaWVMUVJLMEllcHJzQmRkdz09 Meeting ID: 842 1723 4934 Passcode: 153690