Dynamics of vibrational energy flow, quantum computing and laser assisted fusion

Berrios Rojas, Eduardo Ignacio

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https://hdl.handle.net/2142/45654 Copy

Description

Title

Dynamics of vibrational energy flow, quantum computing and laser assisted fusion

Author(s)

Berrios Rojas, Eduardo Ignacio

Issue Date

2013-08-22T16:56:49Z

Director of Research (if dissertation) or Advisor (if thesis)

Gruebele, Martin

Doctoral Committee Chair(s)

Martin Gruebele

Committee Member(s)

• Bhargava, Rohit
• Hirata, So
• McCall, Benjamin J.

Department of Study

Chemistry

Discipline

Chemical Physics

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

Ph.D.

Degree Level

Dissertation

Keyword(s)

• Vibrational Energy Flow
• Quantum Computing
• Fusion.

Abstract

My Ph. D. studies can be divided in three main areas: quantum dynamics, intramolecular vibrational energy flow and gas phase vibrational spectroscopy. In the first area, we showed theoretically that the maximum fidelity reachable with vibrational qubits is approximately 0.9999 and 0.99 for one and two qubits gates, using conventional pulse shaper techniques. However, optimal control theory increases the fidelity for a two qubits gate up to 0.9999. In addition, I simulated the dynamics of two bare nuclei (deuterium-tritium) interacting with a shaped femtosecond laser pulse in one dimension. Simulations showed that the shaped laser pulse is able to keep the two nuclei together and bring them closer than an unshaped gaussian femtosecond laser pulse. This observation opens the question if a shaped femtosecond pulse could increase the fusion reaction rate in the laboratory. In the second area, new sets of stable vibrational states above the dissociation limit of thiophosge (SCCl2) were observed in addition to previously observed ones. These extra states close the gap between experiments and theory predictions. At last, in gas phase spectroscopy, we observed in a molecular beam thiophosgene dimer (S2C2Cl4) and assigned its low frequency vibrations using standard ab-initio and density functional theory. We also introduced Franck-Condon fingerprints to assign complex vibration-tunneling spectra. In this technique we replace precise frequency information with intensity information. As proof-of-concept, we used the excited electronic state of SCCl2 as prototype. An effective vibration-tunneling Hamiltonian was fitted for the B excited electronic state for the first time.

Graduation Semester

2013-08

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http://hdl.handle.net/2142/45654

Copyright and License Information

Copyright 2013 Eduardo Ignacio Berrios Rojas

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