Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 31: Poster: Quantum Optics and Photonics II

Q 31.45: Poster

Dienstag, 24. März 2015, 17:00–19:00, C/Foyer

Implementing controlled NOT operations with ancillary multiphoton states — •Ludwig Kunz, József Zsolt Bernád, Mauricio Torres, and Gernot Alber — Institut für Angewandte Physik, Technische Universität Darmstadt, D-64289 Germany

We investigate the possibility of implementing a CNOT-gate with the help of two material qubits and ancillary coherent multiphoton states. The material qubits, usually implemeted by two-level atoms or ions, are assumed to cross a high-finesse cavity and to interact resonantly with a single-mode of the radiation field. The two qubits are sent through the cavity one after the other. They interact with the radiation field in such a way that the CNOT-gate can be implemented by appropriate postselection of the resulting quantum state of the radiation field. The gate operation which we obtain has imperfections and we control these errors through the flight times. We also investigate the role played by these imperfections in an entanglement purification scheme.