The quantum Fisher information is reformulated as the connected symmetrized covariance of a time-integrated action deformation or as an insertion of the action derivative in the propagator within a path integral framework.
ˇSafr´ anek, J
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Path Integral Approach to Quantum Fisher Information
The quantum Fisher information is reformulated as the connected symmetrized covariance of a time-integrated action deformation or as an insertion of the action derivative in the propagator within a path integral framework.