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A Fisher Information-Based Incompatibility Criterion for Quantum Channels
Qing-Hua Zhang1,2, Ion Nechita2
1School of Mathematical Sciences, Capital Normal University, Beijing 100048, China.
Abstract:
We introduce a new incompatibility criterion for quantum channels based on the notion of (quantum) Fisher information. Our construction is based on a similar criterion for quantum measurements put forward by H. Zhu. We then study the power of the incompatibility criterion in different scenarios. First, we prove the first analytical conditions for the incompatibility of two Schur channels. Then, we study the incompatibility structure of a tuple of depolarizing channels, comparing the newly introduced criterion with the known results from asymmetric quantum cloning.
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