Heidelberg 1999 – wissenschaftliches Programm

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SYQI: Symposium Quanteninformationsverarbeitung

SYQI 3: Quanteninformationsverarbeitung III

SYQI 3.3: Vortrag

Dienstag, 16. März 1999, 15:00–15:15, PH1

On optimal state estimation for d-dimensional quantum systems — •Dagmar Bruß^1,2 and Chiara Macchiavello³ — ¹ISI, Torino, Italy — ²ITP, Hannover, Germany — ³INFM, Pavia, Italy

We establish a connection between optimal quantum cloning and optimal state estimation for d-dimensional quantum systems, generalizing our previous results for qubits. Thus we can derive an upper limit on the fidelity of state estimation for d-dimensional pure quantum states, and, furthermore, for generalized inputs supported on the symmetric subspace.