Fig. 5: Fidelity dynamics of the logical Bell state at finite temperature.
From: Topological prethermal strong zero modes on superconducting processors
a, Measured fidelity dynamics of logical Bell state in the homogeneous (Jo = Je = π/5), the dimerized but resonant (Jo = 2Je = 2π/5), and the dimerized and off-resonant (Jo = 3.17Je = 3.17π/5) cases. The data shown in the solid lines are obtained with initial states being within {|Ψe⟩} and the dashed lines are obtained with initial states being within {|Ψ0⟩}. The initial state preparation circuit is shown in Extended Data Fig. 8a. Error bars represent the standard deviation over five rounds of measurements, with each round taking 10,000 shots for each operator. b, Measured density matrices (green bars) of logical Bell state after a time evolution of t = 10 in the three different cases with initial states being within {|Ψe⟩}. The ideal Bell state density matrix is shown with the hollow frame.