We provide a general framework for handling the effects of a unitary disturbance on the estimation of the amplitude. associated to a unitary dynamics. By computing an analytical and general expression for the quantum Fisher information, we prove that the optimal estimation precision for. cannot be outperformed through the addition of such a unitary disturbance. However, if the dynamics of the system is already affected by an external field, increasing its strength does not necessarily imply a loss in the optimal estimation precision.

Quantum parameter estimation affected by unitary disturbance

ROSSINI, DAVIDE;GIOVANNETTI, VITTORIO
2013

Abstract

We provide a general framework for handling the effects of a unitary disturbance on the estimation of the amplitude. associated to a unitary dynamics. By computing an analytical and general expression for the quantum Fisher information, we prove that the optimal estimation precision for. cannot be outperformed through the addition of such a unitary disturbance. However, if the dynamics of the system is already affected by an external field, increasing its strength does not necessarily imply a loss in the optimal estimation precision.
STATES; METROLOGY; DISTANCE; LIMIT
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11384/38600
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