We find a phase-matching condition for enhancement of sensitivity in a Mach-Zehnder
interferometer illuminated by an arbitrary state in one input port and an odd (even) state in …

We define two ways of quantifying the quantum correlations based on quantum Fisher
information (QFI) in order to study the quantum correlations as a resource in quantum …

We provide a new expression of the quantum Fisher information (QFI) for a general system.
Utilizing this expression, the QFI for a non-full rank density matrix is only determined by its …

We investigate the performance of quantum Fisher information (QFI) under the Unruh-
Hawking effect, where one of the observers (eg, Rob) is uniformly accelerated with respect …

Taking into account the density matrices with non-full ranks, we show that the fidelity
susceptibility is determined by the support of the density matrix. Combining with the …

We analyze the quantum limit of sensitivity in four-dimensional scanning transmission
electron microscopy (4D-STEM), which has emerged as a favored technique for imaging the …

With the development of quantum-information theory, there has been a flurry of
investigations of quantum non-Markovian dynamics, and several significant measures for …

In quantum parameter estimation, the quantum Cramér-Rao bound (QCRB) sets a
fundamental limit on the precision achievable with unbiased estimators. It relates the …

We revisit the issue of extracting information from parallel and antiparallel spins, as initiated
by Gisin and Popescu [Phys. Rev. Lett. 83, 432 (1999) PRLTAO 0031-9007 …

It is well known that a quantum correlated probe can yield better precision in estimating an
unknown parameter than classically possible. However, how such a quantum probe should …