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Physics Colloquium

Speaker: Yogesh Joglekar, Associate Professor of Physics, IUPUI Location: LD 010

Simulating quantum chemistry of molecules, and more, using photonics

Abstract: Quantum simulators are a powerful tool for studying, typically, closed quantum systems that are computationally hard. In the first part of my talk, I will present simulations of vibrational dynamics in molecules that were carried out by using a reprogrammable, unitary photonic chip [1]. They include the unitary evolution of up to four vibrational excitations for several four atom molecules. I will then present simulations for non-unitary processes such as dephased energy transport in a peptide bond, and the thermal relaxation in water. Such non-unitary evolutions also arise naturally due to non-Hermitian Hamiltonians. In the second part of my talk, I will present simulations for multi-particle correlations and various metrics of quantum information in two- and three-mode Hamiltonians with parity-time (PT) symmetry, or mode-selective losses. In contrast to the Lindblad formalism, where entropy increases with time, I will show that PT-symmetric (or mode-selective lossy) Hamiltonians give rise to a rich variety of temporal dependences for quantum information.  

This work is an ongoing collaboration with University of Bristol. 

Reference: Nature 557, 660 (2018).

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Refreshments will be served in LD 154B from 3:00-3:30pm.