Seminar Title: Theoretical approaches to study quantum properties of collective states in a cavity
Seminar Abstract: The interaction of collective states of spins or atoms with a quantum resonator has been harnessed to build different platforms for quantum information processing ranging from quantum computing and simulation to metrology. In this talk, we look at a few theoretical and computational approaches to study the dynamics of these systems. First, we describe how powerful tensor-network methods can be used to investigate the transfer of quantum information from the states of a cavity to the collective states of an ensemble of qubits or spins. Secondly, we show how quantum sensing of rotational properties of collective states of an atomic superfluid can be enhanced by exploiting the tools of quantum optomechanics.
Bio: Himadri Shekhar Dhar is an Assistant Professor in the Department of Physics, Indian Institute of Technology Bombay, India since February 2021. Prior to Mumbai, he was a research assistant at Imperial College London, United Kingdom (2019-2021) and a Lise-Meitner fellow at the Institute for Theoretical Physics, Vienna University of Technology (TU Wien), Austria (2016-2018). He finished his PhD in 2015 from the School of Physical Sciences, Jawaharlal Nehru University, New Delhi, India and till 2016 was a postdoctoral fellow in Harish-Chandra Research Institute, Prayagraj, India. His research focus has been to unravel the physical nature of correlations that connect the various parts of complex and exquisite quantum systems, primarily from the perspective of theoretical quantum information and computing, optics and many-body physics. In recent years, he has been working on quantum dynamics and quantum information protocols in collective states, quantum light-matter interaction and hybrid systems, aiming at developing and optimising quantum technology.