Quantum Fisher Information (QFI) is a quantity that measures the sensitivity of a quantum state to changes in a parameter, providing a way to assess the precision limits of quantum measurements. It plays a crucial role in determining the ultimate precision that can be achieved when estimating parameters of quantum systems, particularly in the context of quantum metrology. A higher QFI indicates greater potential for precision in measurement, making it essential for understanding the limitations imposed by quantum mechanics on measurement processes.
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