Interferometric Measurements of Many-Body Topological Invariants Using Mobile Impurities

August 8, 2016

Figure 1: Topological polarons*
[Reprinted under a Creative Commons CC-BY license]

Topological quantum phases cannot be characterized by Ginzburg–Landau type order parameters, and are instead described by non-local topological invariants. Experimental platforms capable of realizing such exotic states now include synthetic many-body systems such as ultracold atoms or photons. Unique tools available in these systems enable a new characterization of strongly correlated many-body states.


NSTC Report on Quantum Information Science

July 27, 2016

Quantum defects in diamond provide a non-invasive, high-resolution image (right) of the magnetic field produced by a single tumor cell immersed in a sample of human blood. Conventional optical imaging (left) cannot detect the tumor cell because the blood scatters and absorbs light. Magnetic fields pass unaffected through the blood, allowing the magnetically sensitive quantum defects to detect the tumor cell. (Image credit: Walsworth Group/Harvard)


Superconductivity from a Confinement Transition out of a Fractionalized Fermi Liquid with Z2 Topological and Ising-Nematic Orders

July 8, 2016

Figure 2. Mean-field dispersion E+(k) of the fermionic spinons for the parameters (Δ1x, Δ1y, Δ2, t2x, t2y) = (0.9, 1, 0.4, 0.2, 0.2). The other band is not shown for clarity 1. [Reprinted by permission from APS © 2016.]