科研之友
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摘要
We study the precision of parameter estimation for dephasing model under squeezed environment. We analytically calculate the dephasing factor gamma (t) and obtain the analytic quantum Fisher information (QFI) for the amplitude parameter alpha and the phase parameter phi. It is shown that the QFI for the amplitude parameter a is invariant in the whole process, while the QFI for the phase parameter phi strongly depends on the reservoir squeezing. It is shown that the QFI can be enhanced for appropriate squeeze parameters r and theta. Finally, we also investigate the effects of temperature on the QFI.
