107 research outputs found
Optimal state estimation for d-dimensional quantum systems
We establish a connection between optimal quantum cloning and optimal state
estimation for d-dimensional quantum systems. In this way we 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.Comment: 3 page
Optimal cloning for two pairs of orthogonal states
We study the optimal cloning transformation for two pairs of orthogonal
states of two-dimensional quantum systems, and derive the corresponding optimal
fidelities.Comment: 4 pages, 3 figure
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