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Q: Quantenoptik

Q 37: Poster: Quanteninformation

Q 37.6: Poster

Donnerstag, 6. April 2000, 16:30–19:30, Aula

Stabilizing Grover’s Algorithm — •Aldo Delgado, Michael Mussinger, and Gernot Alber — Abteilung für Quantenphysik, Universität Ulm, D-89069 Ulm, Germany

Grover’s database search algorithm [1] is a simple but powerful example for the advantage of quantum computing. To protect the quantum behaviour of our system against errors, several methods have been proposed. We combine error correction [2] and error avoiding [3] codes to stabilize Grover’s algorithm against coherent and dissipative errors. Numerical simulations for various kinds of errors show the advantages and disadvantages of these techniques. Financial support by the DFG within the SPP quantum-information-processing is acknowledged.

[1] L.K. Grover, Quantum Mechanics Helps in Searching for a Needle in a Haystack, Phys. Rev. Lett.79, 325 (1997).

[2] E. Knill and R. Laflamme, Theory of quantum error-correcting codes, Phys. Rev. A 55, 900 (1997).

[3] P. Zanardi and M. Rasetti, Noiseless Quantum Codes, Phys. Rev. Lett. 79, 3306 (1997).