Figure 35

Figure 35: Examples of the sum quantum noise power (double-sided) spectral densities of the resonance-tuned interferometers with frequency-dependent squeezing and/or homodyne angles. Left: no optical losses, right: with optical losses, ηd = 0.95. ‘Ordinary’: no squeezing, ϕLO = π ∕2. ‘Squeezed’: 10 dB squeezing, 𝜃 = 0, ϕ = π ∕2 LO (these two plots are provided for comparison). Dots [pre-filtering, Eq. (403View Equation)]: 10 dB squeezing, ϕLO = π ∕2, frequency-dependent squeezing angle. Dashes [post-filtering, Eq. (408View Equation)]: 10 dB squeezing, 𝜃 = 0, frequency-dependent homodyne angle. Dash-dots [pre- and post-filtering, Eq. (410View Equation)]: 10 dB squeezing, frequency-dependent squeeze and homodyne angles. For all plots, J = J aLIGO and γ = 2π × 500 s− 1.