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Phys Rev Lett. 2001 Feb 12;86(7):1366-9.

Fidelity balance in quantum operations.

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  • 1Center for Quantum Information and Rochester Theory Center for Optical Science and Engineering, University of Rochester, Rochester, New York 14627, USA.


I derive a tight bound between the quality of estimating the state of a single copy of a d-level system, and the degree the initial state has to be altered in the course of this procedure. This result provides a complete analytical description of the quantum mechanical trade-off between the information gain and the quantum state disturbance expressed in terms of mean fidelities. I also discuss consequences of this bound for quantum teleportation using nonmaximally entangled states.

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