Fig. 4: Experimental setup.
From: Experimental study of quantum coherence decomposition and trade-off relations in a tripartite system
a Molecular structure of Diethyl fluoromalonate. The three nuclear spins 13C, 1H and 19F adopted in the experiment are labeled. The corresponding qubit index is also marked in red for each nuclear spin with a black arrow. b Parameters of the natural Hamiltonian of the three-spin system are shown in this table. The diagonal terms are the values of the chemical shift and the off-diagonal terms represent the scalar coupling between the different nuclei. c and d shows the schematic diagram explaining the experimental procedure for Hzz and Hzzz, respectively. In the initialization part, we prepare the system from a pseudopure state (PPS) into the designed Hamiltonian’s ground state. In the evolution part, a discrete refocusing scheme is used to perform two Hamiltonians. Combining with Trotter expansion, we can perform adiabatic evolution under any interaction. The wide and narrow unfilled pulses represent π and π/2 pulses, respectively while the rotation axes are labeled above each pulse. The filled pulses represent a rotation of ωxτ/2, where τ means the length of each Trotter slice. The measurement part is carried out using quantum state tomography.
