Photons are particles with rather special properties. They are easily created by a light source, absorbed by matter, and may repel or attract each other when in contact with a suitable material. The idea of feeding photons into crystal-like structures in which photons move between preferred positions and interact with each other, has recently captured […]
Mohamed has been awarded the 2016 Wayne C. Booth Graduate Student Prize for Excellence in Teaching by the University of Chicago! The Wayne C. Booth Graduate Student Prize for Excellence in Teaching was established in 1991 in honor of Wayne C. Booth, the George M. Pullman Distinguished Service Professor in English Language & Literature and […]
Nicholas has been awarded a Weinberg College Summer Research Grant! This award is made possible by the generous support of the Richman Fund for Undergraduate Research and Weinberg College of Arts and Sciences alumni.
Andy Li presents his research during a poster session at the Northwestern site visit by the NSF MPS Directorate. (Photo credit: Roger Anderson)
The problem of interacting bosons in frustrated lattices is an intricate one due to the absence of a unique minimum in the single-particle dispersion where macroscopic number of bosons can condense. In this paper, we consider a family of tight-binding models with macroscopically degenerate lowest energy bands, separated from other bands by a gap.We predict […]
Microwave photons inside lattices of coupled resonators and superconducting qubits can exhibit surprising matter-like behavior. Realizing such open-system quantum simulators presents an experimental challenge and requires new tools and measurement techniques. Here, we introduce Scanning Defect Microscopy as one such tool and illustrate its use in mapping the normal-mode structure of microwave photons inside a […]
We study the properties of an advanced superconducting circuit, the 0-π circuit. This device, previously introduced by Brooks et al. in Phys. Rev. A 87, 052306 (2013), has multiple intriguing characteristics. With the right choice of parameters – it can exhibit a (near) degeneracy of the ground state, be robust with respect to dephasing, and […]
One of our group members, Andy (Cheong Yiu) Li, has received the 2014 World Quantitative and Science Scholarship by the WorldQuant Foundation. Find more information about the scholarship here.
The exact treatment of Markovian open quantum systems, when based on numerical diagonalization of the Liouville super-operator or averaging over quantum trajectories, is severely limited by Hilbert space size. Perturbation theory, standard in the investigation of closed quantum systems, has remained much less developed for open quantum systems where a direct application to the Lindblad […]
Photon-based strongly-correlated lattice models like the Jaynes-Cummings and Rabi lattices differ from their more conventional relatives like the Bose-Hubbard model by the presence of an additional tunable parameter: the frequency detuning between the pseudo-spin degree of freedom and the harmonic mode frequency on each site. Whenever this detuning is large compared to relevant coupling strengths, […]