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Ludovic Santos

Background

  • BA in chemistry, ULB (2008-2011)
  • MA in chemistry, ULB (2011-2013)
  • Master thesis: Recherche d'une impulsion laser optimale efectuant une transformée de Fourier quantique à 3-qubits implémentés sur les niveaux d'énergie vibrationnels d'un ion de Cd+ piégé dans un potentiel anharmonique
  • PhD student in Sciences, ULB, FRIA grant, (2013-present)

PhD project

Control of atomic and molecular populations: application to intramolecular vibrational redistribution and quantum computing.
The goal of this project is to use the expertise of laboratories Chimie Quantique et Photophysique of the ULB and Chimie Physique of Université de Paris-sud in the field of molecular dynamics induced by the action of electromagnetic waves, to address two issues linked to laser control. Both issues have methodological challenges but are potential candidates for an experimental achievement of quantum optimal control. For the first part which is the continuation of our master's thesis, we will use the vibration levels of trapped ions to achieve a quantum algorithm of molecular dynamics by propagating wave packet. To do so, the first step will be to increase the number of qubits of the system from 3 to 4 or 5 qubits for the operation of the Fourier transform. Then, we translate the action of the evolution operator in terms of elementary quantum gates using the split operator method. We will take a special interest in obtaining realistic pulses improving the algorithms of our programs imposing experimental constraints.
The second part focuses on the dynamics of intramolecular vibrational redistribution of the acetylene molecule to which a highly accurate effective Hamiltonian was built at ULB. We plan to use this global Hamiltonian to control the vibrational redistribution. We will calculate the electric dipole matrix elements and then create control experiments on acetylene and provide initial laser pulses. We focus on the bending modes of acetylene and in particular the highly excited bending modes of the electronic ground state which are assumed to be at the origin of the isomerization to vinylidene. Finally, decoupling of bending modes of acetylene could be exploited for the implementation of quantum logic gates.

Publications

See here.

Teaching Activities

  • Teaching assistant for the course " Mécaniques classique et quantique " (CHIM-F206), BA2 Chimie, (ULB), 10 ECTS (2015).

Université Libre de Bruxelles – Faculté des Sciences