Figure 4

(a) Rydberg state \(|50S_{1/2}>\) AC Stark shift δ fitted to E field. (b) Measured EIT signals acquired without MW field (black dotted curve), with an applied 946 MHz −7 dBm MW field and resonator (green solid curve) and with an applied 946 MHz 25 dBm MW field (yellow dotted curve). The figure shows green and yellow curve have same AC shift \(\delta _{l}\) of about 19.9 MHz. (c) Measured enhancement factor versus MW E-field frequency. (d) Measured S11 versus MW E-field frequency. Red solid curve is without cell and green dotted curve is with cell