Schulte, Marius; Martínez-Lahuerta, Victor J.
(Wien : Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften, 2020)
We consider a large class of Ramsey interferometry protocols which are enhanced by squeezing and un-squeezing operations before and after a phase signal is imprinted on the collective spin of N particles. We report an ...