Fig. 2
From: Secure quantum remote state preparation of squeezed microwave states
Tomography of remotely prepared states. a Squeezing level Srp (circles), antisqueezing level Arp (diamonds), and squeezing angle γrp (triangles) of remotely prepared states as a function of the JPA 3 degenerate gain Gf at fixed angle γf = 0°. The lines show a fit to the data. The error bars denote the standard error of the mean calculated from multiple repetitions of the protocol. If not shown, the error bars are smaller than the symbol size. b, c Reconstructed Wigner functions of the remotely prepared states for the optimal and one of the non-optimal JPA 3 gains as marked by the dashed lines in panel (a). d, e Srp and γrp of the remotely prepared states as a function of the feedforward parameters. Panels (f), (g) show a joint fit of the three quantities (Srp, Arp, γrp) to the corresponding data in panels (d), (e), respectively (see Supplementary Fig. 3 for the results for Arp). The green lines mark the threshold Srp ≥ 0 dB for squeezing below the vacuum limit. The optimal point is marked by the blue star. The data and fit in panel (a) are marked by dotted lines in panels (d–g)
