Frankfurt 2006 – scientific programme

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Q: Quantenoptik und Photonik

Q 77: Poster Quantencomputer

Q 77.8: Poster

Thursday, March 16, 2006, 16:30–18:30, Labsaal

The Quantum Fourier Transform in a molecular vibrational qubit system — •Ulrike Troppmann, Caroline Gollub, and Regina de Vivie-Riedle — Ludwig-Maximilians-Universität, Department Chemie, Butenandtstr. 11, 81377 München

In our proposal of molecular quantum computing, we have suggested to use vibrational eigenstates of a molecule to encode the qubit states. Merging the ideas of coherent control and quantum computation, specially shaped ultrashort laser pulses, caculated with a multi target optimal control algorithm, induce the global quantum gates [1]. We discuss aspects of phase control and phase development in such multi qubit systems and suggest that, as an alternative to direct laser control, any phase rotation gate can be implemented by free evolution of the system during a defined delay between qubit flip pulses [2]. This new approach introduces a great flexibility to our concept of molecular quantum computing, with regard to the basis set independence of single quantum gates and the robust implementation of quantum algorithms. We demonstrate this with the realization of the Quantum Fourier Transform in a model vibrational qubit system.

[1]  C. M. Tesch, R. de Vivie-Riedle, Phys. Rev. Lett., 89, (2002), 157901.

[2]  U. Troppmann, C. Gollub, R. de Vivie-Riedle, submitted to N. J. Phys.