Fidelity balance in quantum operations

Details Fidelity balance in quantum operations Fidelity balance in quantum operations

2000-03-27

arxiv.org/abs/quant-ph/0003123v2

Phys. Rev. Lett. 86, 1366 (2001)

Physics

Quantum Physics

4 pages, REVTeX. Revised version

Scientific paper

10.1103/PhysRevLett.86.1366

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 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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