Stuttgart 2012 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 8: Quanteninformation: Konzepte und Methoden 2
Q 8.6: Talk
Monday, March 12, 2012, 15:15–15:30, V38.04
Reconstructing Density Matrices Efficiently — •Tillmann Baumgratz1, David Gross2, Marcus Cramer1, and Martin B. Plenio1 — 1Institut für Theoretische Physik, Albert-Einstein-Allee 11, Universität Ulm, D-89069 Ulm, Germany — 2Physikalisches Institut, Hermann-Herder-Straße 3, Albert-Ludwigs Universität Freiburg, D-79104 Freiburg i.Br., Germany
Recent contributions in the field of quantum state tomography for large systems have shown that the drawback of the exponential growth of the Hilbert space can be circumvented by tailored reconstruction schemes and restricting attention to certain classes of states. In this talk we discuss methods to reconstruct (mixed) density matrices that are close to matrix product operators. The reconstruction scheme only requires local information of the state -- giving rise to a reconstruction scheme that scales algebraically in the system size.