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Q: Fachverband Quantenoptik und Photonik

Q 63: Quanteninformation: Quantencomputer

Q 63.7: Talk

Friday, March 6, 2009, 15:30–15:45, VMP 6 HS-A

Scaling of passive quantum memories — •Fernando Pastawski, Alastair Kay, Norbert Schuch, and Juan Ignacio Cirac — Max-Planck-Institut für Quantenoptik Hans-Kopfermann-Str. 1, D-85748 Garching, Deutschland

Fault tolerance theorems state that it is possible to construct reliable (active) memories from unreliable components given resources such ass fresh ancillas. Furthermore, recent proposals claim that some many-body Hamiltonians may act as passive memories, asymptotically allowing reliable storage of quantum information. We explore different error models for such Hamiltonians and information encodings and obtain some no-go results in the absence of entropy extraction mechanisms.