Fig. 5
From: Quantum-enhanced sensing using non-classical spin states of a highly magnetic atom
Dephasing of coherences. a Evolution of the modulus of the extremal coherence |ρ−8,8| (blue circles) calculated from the tomography of the superposition state after a wait time t. The horizontal error bars correspond to the standard deviation of the Larmor precession times required for tomography. Vertical error bars are the 1σ statistical error computed using a random-weight bootstrap method. b Evolution of the mean transverse spin amplitude J⊥ for an initial state |J〉x in the same magnetic field environment than for the data in a. The solid lines in a and b are exponential fits of the data. c, d Density matrix and Wigner function reconstructed for t = 70 ± 3 µs, i.e. after a strong damping of coherences
