Information - Disturbance Tradeoff in the Estimation of a Unitary Transformation
arXiv:1006.5665 · doi:10.1103/PhysRevA.82.062305
Abstract
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.
arXiv comment10 pages, 4 figures
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- Optimal processing of reversible quantum channels
- Universal construction of decoders from encoding black boxes
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- Optimal quantum discrimination of single-qubit unitary gates between two candidates
- Information Disturbance Tradeoff in Bidirectional QKD