Figure 39

Figure 39: Examples of the sum quantum noise power (double-sided) spectral densities of the resonance-tuned interferometers with the single filter cavity based pre- and post-filtering. Left: pre-filtering, see Figure 37 (left); dashes – 10 dB squeezing, ϕLO = π ∕2, ideal frequency-dependent squeezing angle (404View Equation); thin solid – 10 dB squeezing, ϕ = π∕2 LO, numerically-optimized lossy pre-filtering cavity with −9 − 7 −6.5 − 6 Af∕Lf = 10 , 10 10 and 10. Right: post-filtering, see Figure 37 (right); dashes: 10 dB squeezing, 𝜃 = 0, ideal frequency-dependent homodyne angle (407View Equation); thin solid – 10 dB squeezing, 𝜃 = 0, numerically optimized lossy post-filtering cavity with A ∕L = 10−9, 10−8 and 10− 7 f f. In both panes (for the comparison): ‘Ordinary’ – no squeezing, ϕLO = π∕2; ‘Squeezed’: 10 dB squeezing, 𝜃 = 0, ϕLO = π∕2