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MO: Fachverband Molekülphysik

MO 57: Poster: Quantum Control

MO 57.6: Poster

Donnerstag, 22. März 2007, 16:30–18:30, Poster A

Transfer of Vibrational Energy and Quantum Information through Molecular Chains — •Caroline Gollub, Markus Kowalewski, Ulrike Troppmann, and Regina de Vivie-Riedle — LMU Department Chemie, Butenandt-Str. 11, 81377 München, Germany

We are interested in the mechanisms of intramolecular vibrational energy transfer in the context of quantum information transfer and developed different approaches to describe one-dimensional chain molecules. The linear systems consisting of (C≡C−)_n units are set up with a flexible, modular ansatz based on ab initio quantum chemical data and vibrational eigenfunctions. Additionally, octatetrayne, as a chain molecule, is treated explicitly in a local eigenstate representation. In the modular approach the propagation behavior of the linear, kinetic coupled quantum oscillators of the molecular chains could be studied and dynamical aspects of the vibrational energy transfer were clarified.

These molecular bridge systems offer an innovative possibility to construct quantum networks within our approach of molecular quantum computing [1]. The vibrational qubits are encoded in molecular subunits, linked by the molecular chains. The bridging molecules guarantee the communication between the subunits, which is realized by specially shaped laser pulses, calculated with Optimal Control Theory. Selective quantum state transfer through different quantum channels of the bridging molecules, as well as the entanglement generation and the corresponding mechanisms of the processes are presented.

[1] C. M. Tesch, R. de Vivie-Riedle, Phys. Rev. Lett., 89, (2002).