Wilfred Salmon

Compression of metrological quantum information in the presence of noise

2023 · arXiv (Cornell University)

In quantum metrology, information about unknown parameters $\mathbfθ = (θ_1,\ldots,θ_M)$ is accessed by measuring probe states $\hatρ_{\mathbfθ}$. In experimental settings where copies of $\hatρ_{\mathbfθ}$ can be produced rapidly (e.g., in optics), the information-extraction bottleneck can …

Comment on “Saturating quantum advantages in postselected metrology with the positive Kirkwood-Dirac distribution”

2024 · Physical Review A

In a recent paper [Das, Modak, and Bera, Phys. Rev. A 107, 042413 (2023)], Das et al. claim that Kirkwood-Dirac negativity is not required to achieve anomalous values of the quantum Fisher information encoded in …