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- W4311541732 abstract "We obtain the accuracy limit for estimating the expectation value of the position of a relativistic particle for an observer moving along one direction at a constant velocity. We use a specific model of a relativistic spin-1/2 particle described by a gaussian wave function with a spin down in the rest frame. To derive the state vector of the particle for the moving observer, we use the Wigner rotation that entangles the spin and the momentum of the particle. Based on this wave function for the moving frame, we obtain the symmetric logarithmic derivative (SLD) Cramer-Rao bound that sets the estimation accuracy limit for an arbitrary moving observer. It is shown that estimation accuracy decreases monotonically in the velocity of the observer when the moving observer does not measure the spin degree of freedom. This implies that the estimation accuracy limit worsens with increasing the observer's velocity, but it is finite even in the relativistic limit. We derive the amount of this information loss by the exact calculation of the SLD Fisher information matrix in an arbitrary moving frame." @default.
- W4311541732 created "2022-12-27" @default.
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- W4311541732 date "2022-12-05" @default.
- W4311541732 modified "2023-10-18" @default.
- W4311541732 title "Effect of Wigner rotation on estimating the unitary-shift parameter of a relativistic spin-1/2 particle" @default.
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- W4311541732 doi "https://doi.org/10.1103/physreva.106.062404" @default.
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