Operators describing minimal-disturbance information gain in quantum measurements expand into unitary operators, allowing observable disturbance statistics to define a tight upper bound on information gain.
Williams, Superpositions of unitary operators in quan- tum mechanics, IOP Sci.1, 035204 (2020)
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An operator-based bound on information and disturbance in quantum measurements
Operators describing minimal-disturbance information gain in quantum measurements expand into unitary operators, allowing observable disturbance statistics to define a tight upper bound on information gain.