Figure 3: Magnetic phases.
From: Quantum annealing for the number-partitioning problem using a tunable spin glass of ions
On varying the laser detuning δ and the transverse magnetic field B, we mark, for N=6 ions and ωz=2π × 770 kHz, those regions in configuration space where the ferromagnetic order parameter νFM, the spin glass order parameter νSG, or the longitudinal magnetic susceptibility χ take larger than average values (
=0.13, 
=5, 
=1.6). Below each phonon resonance (marked by the dashed horizontal lines), there is a regime where large values of νSG and χ indicate spin glass behaviour for sufficiently weak transverse field B. To break the Z2 symmetry of the Hamiltonian, all quantities were calculated in the presence of a biasing field 
(with 
).
