Figure 2

Finite-time correlations of single-mode squeezed microwave states at the frequency f₀ = 5.323 GHz. Top graph (a) illustrates the second order correlation function g⁽²⁾(τ) of single-mode squeezed states fitted with Eq. (1). Bottom graph (b) depicts the impact of a finite-time delay on the path entanglement quantified via the negativity kernel N _k (τ), which can be accurately fitted using Eq. (2). In both graphs, symbols depict experimental data, lines show corresponding theoretical fits, S _e is the experimental squeezing level in JPA1, while S is the fitted one, and n is the fitted noise photon number. Fitting parameters and color codes are the same for (a,b). When not shown, statistical error bars are smaller than the symbol size.