Information - Disturbance Tradeoff in the Estimation of a Unitary Transformation

Details Information - Disturbance Tradeoff in the Estimation of a Unitary Transformation Information - Disturbance Tradeoff in the Estimation of a Unitary Transformation

2010-06-29

arxiv.org/abs/1006.5665v2

Phys. Rev. A 82, 062305 (2010)

Physics

Quantum Physics

10 pages, 4 figures

Scientific paper

10.1103/PhysRevA.82.062305

We address the problem of the information-disturbance trade-off associated to the estimation of a quantum transformation, and show how the extraction of information about the a black box causes a perturbation of the corresponding input-output evolution. In the case of a black box performing a unitary transformation, randomly distributed according to the invariant measure, we give a complete solution of the problem, deriving the optimal trade-off curve and presenting an explicit construction of the optimal quantum network.

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