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(a) A linear Mach-Zehnder interferometer. (b) A nonlinear interferometer with parametric amplifiers (PA1 and PA2) as the equivalent beam splitters.
(Color online) Layout for an experimental realization of the nonlinear interferometer. H: half wave plate; PBS: polarization beam splitter; AOM: acoustic optic modulator; GL: Glen laser polarizer; GT: Glen-Thompson polarizer; SMF: single-mode fiber; D: detector.
(Color online) Interference fringes for the nonlinear interferometer. (a) Signal output. (b) Idler output.
(Color online) Visibility of interference fringe as a function of power gain |g 0|2. Green squares: idler fringe; blue diamond: signal fringe; red solid line: plot of the function in Eq. (10); the function is multiplied by a factor of 0.95 for imperfect alignment. The arrow corresponds to the gain for Fig. 3.
(Color online) Logarithmic of the maximum intensity of the interference fringe as a function of logarithmic of the intensity of the phase sensing field inside the nonlinear interferometer. Inset: linear scale plot; red solid line: fit to the function in Eq. (11); dashed line: slope 2 for quadratic dependence.
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