Bose-Hubbard lattice as a controllable environment for open quantum systems
Physical Review A American Physical Society 97:4 (2018) 040101(R)
Abstract:
We investigate the open dynamics of an atomic impurity embedded in a one-dimensional Bose-Hubbard lattice. We derive the reduced evolution equation for the impurity and show that the Bose-Hubbard lattice behaves as a tunable engineered environment allowing one to simulate both Markovian and non-Markovian dynamics in a controlled and experimentally realizable way. We demonstrate that the presence or absence of memory effects is a signature of the nature of the excitations induced by the impurity, being delocalized or localized in the two limiting cases of a superfluid and Mott insulator, respectively. Furthermore, our findings show how the excitations supported in the two phases can be characterized as information carriers.Coherent microwave-to-optical conversion via six-wave mixing in Rydberg atoms
Physical Review Letters American Physical Society 120:9 (2018) 093201
Abstract:
We present an experimental demonstration of converting a microwave field to an optical field via frequency mixing in a cloud of cold 87Rb atoms, where the microwave field strongly couples to an electric dipole transition between Rydberg states. We show that the conversion allows the phase information of the microwave field to be coherently transferred to the optical field. With the current energy level scheme and experimental geometry, we achieve a photon conversion efficiency of \sim 0.3\% at low microwave intensities and a broad conversion bandwidth of more than 4~MHz. Theoretical simulations agree well with the experimental data, and indicate that near-unit efficiency is possible in future experiments.Topological Spin Models in Rydberg Lattices
Chapter in Exploring the World with the Laser, Springer Nature (2018) 351-369
The tensor network theory library
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT (2017) ARTN 093102
Terahertz field control of interlayer transport modes in cuprate superconductors
Physical Review B - Condensed Matter and Materials Physics American Physical Society 96:6 (2017) 064526