We revisit well-known protocols in quantum metrology using collective spins and propose a
unifying picture for optimal state preparation based on a semiclassical description in phase …

Recent developments in atomic physics have enabled the experimental generation of many-
body entangled states to boost the performance of quantum sensors beyond the Standard …

We study a variational class of generalized Ramsey protocols that include two one-axis
twisting (OAT) operations, one performed before the phase imprint and the other after. In this …

Classical shadows (CS) have emerged as a powerful way to estimate many properties of
quantum states based on random measurements and classical post-processing. In their …

We introduce tqix. pis, a library of tqix, for quantum dynamics simulation of spin ensembles.
The library emulates a dynamic process by a quantum circuit, including initializing a …

Parity or quadratic spin (eg, J z 2) readouts of a Mach–Zehnder (MZ) interferometer probed
with a twin Fock (TF) input state allow saturating the optimal sensitivity attainable among all …

We show that the lowest quantum Cramér-Rao bound achievable in interferometry with a
one-axis twisted spin coherent state is saturated by the asymptotic method of moments error …