DCMPMS Seminars

Cold atom quantum technology

by Dr. Bodhaditya Santra (Center for Optical Quantum Technologies, University of Hamburg, Germany)

Tuesday, October 31, 2017 from to (Asia/Kolkata)
at AG66
Understanding and applying physical laws of nature in the microscopic level has resulted the ground breaking discoveries of transistors and lasers. Such discoveries from the first quantum revolution has opened a new era of science and technology, which is ever growingly enabling our ability to control and manipulate quantum effects in a variety of many-body systems. The goal of the second quantum revolution, which is presently unfolding worldwide, is to establish state-of-the-art application domains which will facilitate quantum sensing, metrology, communication, computing and simulation. Development of these technologies requires top level research on basic science exploring the quantum coherence, superposition and entanglement. With the unprecedented controllability over various parameters, such as, tunneling strength, interactions, level of disorder, ultracold quantum gases trapped in optical lattices provide a unique system for engineering the future quantum technologies. 

In my talk, I will present the results obtained with a 87Rb Bose-Einstein condensate (BEC) loaded in an optical lattice. Using a scanning electron microscope (SEM) [1], we prepared the initial state and observed “Negative differential conductivity” in an interacting quantum gas [2]. By using the SEM as a dissipative potential on a single lattice site we observed bistability in a driven dissipative superfluid [3]. In the last part of my talk, I will present the recent progress of a 173Yb Fermi gas experiment towards quantum simulation of lattice systems with orbital degrees of freedom, like Kondo lattice model.

[1] 	B. Santra and H. Ott, J. Phys. B. 48, 122001 (2015)
[2] 	R. Labouvie, B. Santra, S. Heun, S. Wimberger, H. Ott, Phys. Rev. Lett.115, 050601 (2015)
[3] 	R. Labouvie, B. Santra, S. Heun, H. Ott, Phys. Rev. Lett. 116, 235302 (2016)