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Equation 67 · A Reference Frame Becomes Classical by Publishing Its Orientation

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ν\nu

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ν\nu

Symbol nu

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Quantum Fisher information measures the local statistical distinguishability of neighboring states. Braunstein and Caves derived the quantum statistical metric by optimizing distinguishability over measurements [ 9 ] . For a single parameter θ\theta and ν\nu independent repetitions, the quantum Cramér–Rao relation is commonly written

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