We perform research in theoretical condensed matter physics, including quantum information processing, computational physics, transport phenomena, energy conversion and solar energy, as well as the dynamics of complex systems. Our research work is interdisciplinary and also explores the interface between atomic physics, quantum optics, nano-science, and computing. We are also studying artificial photosynthesis, light-to-electricity conversion, nano-mechanics, hybrid quantum electro-mechanical systems, quantum nano-electronics and quantum emulators. Particular emphasis is being placed on superconducting Josephson-junction qubits, scalable quantum circuitry and improved designs for their quantum control. An underlying theme of our work is to better understand nano-scale quantum systems and devise methods to control them. We use physical models to make predictions that can be tested experimentally and that can be used to better understand the observed phenomena.
Our group's research utilizes experimental nonlinear optics to study various phenomena in the field of quantum information science. One core aspect of this research is to improve our understanding of the fundamental physics surrounding quantum entanglement and quantum states of light. A second aspect involves utilizing these concepts in various computation, communication, and measurement protocols to enhance performance beyond classical limits.
The fundamental process involved in this research is four-wave mixing in warm atomic vapor. This process generates pairs of photons in separate spatial modes that exhibit stronger correlations than allowed by classical physics, in multiple degrees of freedom. When a laser is used to seed the process, bright “twin beams” of light are created. The correlations in these “twin beam” states are exploited to enhance, for example, interferometric measurements and the resolution of imaging systems. Investigating novel methods to generate highly multimode “squeezed light” is an important aspect of this research area.