Frankfurt 2006 – scientific programme

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Q: Quantenoptik und Photonik

Q 63: Quanteninformation V

Q 63.1: Talk

Thursday, March 16, 2006, 14:00–14:15, HVI

Fitting channels to tomography data — •Michael Reimpell and Reinhard F. Werner — Institut für Mathematische Physik, TU Braunschweig, Mendelssohnstraße 3, 38106 Braunschweig

Quantum channel tomography yields a sequence of measuring results for the preparations and measurements given by the tomography strategy. These results are subject to errors and therefore may be contradictory or unphysical. We show that a quantum channel, which is close to the tomography data in a least squares sense, can efficiently be found via conic programming. For incomplete tomography, the result may not be unique. In this case, we compute the best and worst case fidelity with respect to a given unitary channel.