Information-Disturbance Tradeoff in Estimating a Maximally Entangled State
Massimiliano Federico Sacchi · Physical Review Letters · 2006
We derive the amount of information retrieved by a quantum measurement in estimating an unknown maximally entangled state, along with the pertaining disturbance on the state itself. The optimal tradeoff between information and disturbance is obtained, and a corresponding optimal measurement is provided.