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People Profiles

Gretchen Campbell, Fellow
Campbell is a NIST JQI fellow and works in the Laser Cooling and Trapping group. In her atom circuits lab, reserachers probe Na BECs in toroidal traps. The goals of these experiments include studying superfluidity, as well as superfluid analogs to superconducting circuits. A second experiment with ultracold strontium is being built. She received a Ph.D from MIT in 2006, where she worked with Wolfgang Ketterle and Dave Pritchard. There, she used Rb BECs in optical lattices to study atom interferometry, nonlinear atom optics and the superfluid – Mott insulator phase transition. These experiments included the first direct observation of the atomic recoil momentum in dispersive media. More recently, she worked with Jun Ye on precision measurements and frequency metrology with an ^{87}Sr optical lattice clock.

Phil Richerme
Phil Richerme is a postdoc in Chris Monroe's Trapped Ion Quantum Information Group. He studies quantum magnetism using a wellcontrolled and wellisolated system of atomic ion spins, realizing Feynman's original proposal for a quantum simulator. These experiments probe the ground state and dynamical evolution of interacting spin systems, which are difficult (or impossible) for classical computers to calculate for even a few dozen spins. Phil received his Ph.D. from Harvard in 2012, working with Gerald Gabrielse and the ATRAP collaboration at CERN to trap antihydrogen atoms for sensitive tests of CPT symmetry.

Crystal Senko
Crystal Senko is a graduate student in Chris Monroe's ion trapping group. While in the group she has focused on ultrafast spin manipulation as well as quantum simulation of magnetism. Senko is an undergraduate alumni of Duke University, where she worked with Dan Gauthier on magnetooptical trapping using distributed feedback lasers.

James R. Williams
James R. Williams is the newest JQI fellow, having arrived in March 2014. He is an assistant professor of physics at the University of Maryland, and his chief area of research is experimental condensed matter physics. Specifically, he specializes in understanding why certain one and twodimensional materials (e.g. topological insulators, graphene) depart from normal conductivity provided by free electrons.
Jimmy, as he likes to be called, almost didn’t go to college. All he wanted to do was work on cars. His mother forced him to apply to one college, so he choose Santa Clara University where he previously attended a basketball camp. He majored in engineering, but his favorite courses involved physics, so he changed direction again. This is how he arrived at his chosen area of research.
Eventually he got a PhD from Harvard University in 2009 on the subject of grapheme, while studying under Charles M. Marcus. He was then a postdoctoral fellow at Stanford before coming to Maryland.

Mohammad Hafezi
Hafezi is a senior research associate and works at the interface of condensed matter theory and quantum optics. The focus of his research is on theoretical and experimental investigations of artificial gauge fields and topological order in photonics systems. Such systems can be exploited as robust optical devices insensitive to disorder, which is the subject of his NSF Physics Frontier Center’s seed funding program. Moreover, in the presence of strong optical nonlinearity, such systems are expected to exhibit fractional quantum Hall physics, providing a platform for potentially observing anoynic statistics. He received his Ph.D. from Harvard in 2009 where he worked with Mikhail Lukin and Eugene Demler. There, he studied strongly correlated physics in AMO systems. In particular, he worked on the topological characterization of ultracold atoms in 2D and also nonequilibrium dynamics of strongly interacting photons in 1D.

Steven Olmshenck
NRC postdoctoral fellow Steven Olmschenk will be joining the faculty at Denison University located in Granville, Ohio. Steve was a graduate student in Chris Monroe’s Trapped Ion Quantum Information group. For the last few years he has been a postdoc in the NIST Laser Cooling and Trapping Group. While at NIST he has worked on Trey Porto’s doublewell optical lattice experiment. Upon moving to Dension he plans to build an ion trapping experiment.
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