"Nano Photonics for Controlling Quantum Dynamics and Thermal Transfer"

Dr. Hamidreza Chalabi, Research Scientist, University of Maryland

November 16th (Friday), 3:00pm
(Note time change)
Engineering Science Building (ESB), Rm 2001

The rapid advance of nano-photonics and quantum optics is playing an increasing role in providing critical solutions in a diverse range of applications including secure communication, green-energy harvesting, health, and quantum computation.

In the era of Internet of things and big data when cyber-attacks can cause existential threats to our lives, fast and secure communication has become exceedingly desirable. Although conventional data servers and computers keep improving, they will soon reach their limits to keep pace with the evolution of our technological lifestyle. In the past two decades, the idea of quantum computation as the alternative to conventional computation has excited scientists. The ability to control and manipulate the dynamics of quantum systems is essential for quantum computation and processing. Different types of feedbacks can realize such control and manipulation of quantum dynamics. Recently, coherent quantum feedback has been proposed which can provide faster control relative to the more conventional measurement-based feedback. In this talk, I will present our recent developed method to describe the dynamics of an arbitrary quantum system under a bidirectional time delay coherent feedback loop. This technique provides a numerically efficient solution for describing a system’s dynamics in the case of significant time delays. The developed method enables us to study a broad range of nonlinear quantum systems. Few examples of such systems have been studied using this technique which will be presented.

In the second part of this seminar, I will discuss the novel effects that are enabled by nanophotonics in the near-field and far-field thermal transfer. Using our developed method, I will show the effect of the geometrical shape on the radiative thermal transfer between an array of beams and a planar substrate. Moreover, I will demonstrate that a judicious nano-structuring of a SiC surface can focus thermal emission of a preselected spectral range to a well-defined height above the surface. The ability to concentrate thermal radiation can impact the design and operation of next generation thermophotovoltaic cells, can afford control over local heat generation, and can mitigate challenges associated with thermal management in low thermal budget devices.

About Dr. Hamidreza Chalabi:

photo of Hamidreza ChalabiHamidreza Chalabi received double bachelor’s degrees in Electrical Engineering and Physics from Sharif University of Technology, Tehran in 2009. He earned his PhD in Jan of 2016 from the EE department at Stanford University, working on Nano-photonics structures for photodetection and radiative thermal transfer control. After graduation he joined the Electrical Engineering department at University of Texas Austin as a post-doctoral researcher. He has continued his research in the field of nano-photonics by joining the Joint Quantum Institute at University of Maryland in Sept of 2017 where he is working on different concepts of quantum optics and quantum random walk.

Hosted by: Professor Umesh Mishra, ECE