JILA 10th Floor - Foothills Room

Abstract: Learning the expectation values of observables is an important task in quantum information, with applications to characterization of quantum devices and quantum optimization algorithms. We propose an estimation method called The Optimal Observable expectation value Learner, or TOOL, that can learn the expectation value of any given observable using the outcomes of any given measurement protocol. We prove that TOOL is minimax optimal for every observable and measurement protocol, and can dramatically outperform classical shadows for many observables of interest.

Free food will be provided at this talk!

Creating, understanding, and controlling metastable states of quantum matter is highly interesting due to the prospects of enabling ultrafast and energy efficient devices with novel functionality. Recent estimates indicates that non-thermal pathways to metastable phases may require several orders of magnitude less energy than a thermally driven process. In addition, hidden states of matter may be accessed if a system out of equilibrium follow trajectories to a state inaccessible, or nonexistent, under normal equilibrium conditions.

Abstract: Polarons, quasiparticles composed of an electronic excitation and the material deformation these cause in a solid or liquid, are ubiquitous. Understanding and controlling their formation, nonequilibrium relaxation, and motion are essential in developing next-generation photocatalysts, energy conversion devices, and even superconductors. In this talk, I introduce some of our recent theoretical advances that enable us to probe the exact quantum dynamics of Holstein polarons subject to dispersive phonon baths in small lattice models to the thermodynamic limit.

National Synchrotron Light Source II (NSLS-II) has world-leading nanoscale X-ray imaging capabilities. The Full-field X-ray Imaging (FXI) beamline offers nanoscale tomography at ~30 nm resolution with an unprecedented imaging throughput down to ~10 seconds. The Hard X-ray Nanoprobe (HXN) beamline delivers multimodal X-ray imaging based on scanning X-ray microscopy with the smallest beam size of ~10 nm. In addition, additional imaging beamlines are either under construction or being designed to further strengthen the imaging portfolio at NSLS-II.

Join us for a special snack time to celebrate our amazing JILA postdocs, in honor of National Postdoc Appreciation Week!

Abtract: A key question for platforms realizing quantum computation, simulation and communication is: How can we grow the size of a quantum system, while keeping high fidelities of single operations?

The next CU Phonon Club seminar of the semester will be held on 3/22. Please join us for a great talk, interesting discussion, and FREE FOOD! Hope to see you there! Additionally, if anyone is interested in being involved in the organization of CU Phonon Club, please email: emma.nelson-1@colorado.edu.