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MO: Molekülphysik

MO 53: Molecular Quantum Computing

MO 53.4: Talk

Thursday, March 16, 2006, 15:00–15:15, H12

The role of anharmonicity and coupling in molecular quantum computing — •Caroline Gollub, Ulrike Troppmann, and Regina de Vivie-Riedle — LMU Department Chemie, Butenandt-Str. 11, 81377 München

Our approach of molecular quantum computing is based on eigenstates of vibrational normal modes of polyatomic molecules encoding the qubits. We analyze the effects of molecular characteristics on the structure of global quantum gates and the complexity of the resulting mechanisms systematically with the goal to judge a molecule’s suitability for molecular quantum computing [1]. Decisive properties of molecular vibrations are the anharmonicity and the mode coupling. In a parametrized two-dimensional model system we can tune these characteristical properties and explore their effects on quantum gates. We find that the interplay of the anharmonicity and the coupling is of prime importance and leads to two basic control mechanisms for all systems. The features of the global quantum gates are explained with characteristic transition frequencies, determined by the molecular parameters. The optimal time for the quantum gates and the limits to obtain simple structures are identified. Based on a universal set of optimized quantum gates we realized an efficient quantum fourier transformation [2].

[1] C. Gollub, U. Troppmann and R. de Vivie-Riedle. submitted to NJP

[2] U. Troppmann, C. Gollub and R. de Vivie-Riedle. submitted to NJP