Fig. 3: Quantum squeezing amplification with the Trotterization technique.
From: Quantum squeezing amplification with a weak Kerr nonlinear oscillator
a Experimental sequence of the Trotter steps for realizing the squeezing amplification. b Measured 1D Wigner function cuts along the real axis (blue symbols) and the imaginary axis (red symbols) of the generated squeezed states for various Trotter steps. Solid lines are a global fit to these two traces at each Trotter step. c Experimentally extracted (symbols) and numerically simulated (dashed lines) squeezing parameters as a function of the number of Trotter steps (bottom axis) or the evolutionary time (top axis) for various displacement amplitudes ∣β∣2. Error bars are the estimated 95% confidence intervals of the fittings. The inset exhibits the extracted squeezing rates as a function of the displacement amplitude ∣β∣2, which agree well with the simulation results (dashed line). The solid line represents the ideal squeezing rate of Kβ2. d Measured 2D Wigner functions of the generated squeezed states for various Trotter steps with ∣β∣2 = 100. The extracted state fidelities and squeezing levels are indicated accordingly.
