Nonlinear quantum metrology schemes can lead to faster than Heisenberg-limited scalings for the measurement uncertainty. We study a Michelson interferometer embedded in Kerr medium [Phys. Rev. A 92, 022104 (2015)] that leads nonlinear, intensity dependent phase shifts corresponding relative changes lengths of its two arms. The Cram\'er-Rao bound on minimum achievable uncertainties is worked out...

Squeezed states of light have been recently used to improve the sensitivity of laser interferometric gravitational-wave detectors beyond the quantum limit. To completely establish quantum engineering as a realistic option for the next generation of detectors, it is crucial to study and quantify the noise coupling mechanisms which injection of squeezed states could potentially introduce. We pres...

We model vacuum fluctuations in quantum gravity with a scalar field, characterized by high occupation number, coupled to the metric. The number of is given thermal density matrix, whose form motivated energy, which have been shown be conformal near light-sheet horizon. For experimental measurement interest an interferometer, size energy fixed area surface bounding volume spacetime being interro...

We present a delay-line polarization Sagnac (1) interferometer that utilizes the increased laser power which will likely be available to future advanced detectors (2) to greatly simplify many laser and interferometer control requirement. We describe how the signal sidebands and the local oscillator are made common path by using a polarizing beamsplitter and controlling the circulating light's p...

We discuss the theory of the Bracewell nulling interferometer and explicitly demonstrate that the phase of the ‘‘white light’’ null fringe is the same as the phase of the bright output from an ordinary stellar interferometer. As a consequence, a ‘‘closure phase’’ exists for a nulling interferometer with three or more telescopes. We calculate the phase offset as a function of baseline length for...

Twyman-Green. This Letter describes a method by which the frequency shift equals 4N times the rotation rate, where N is the number of rotating components available. The advantage of this method over previously described methods is that a higher heterodyne frequency is possible than with the previously described techniques. Let the light entering an interferometer, shown in Fig. 1, be separated ...

We report on the realization of a compact atomic Mach–Zehndertype Sagnac interferometer of 13.7 cm length, which covers an area of 19mm2 previously reported only for large thermal beam interferometers. According to Sagnac’s formula, which holds for both light and atoms, the sensitivity for rotation rates increases linearly with the area enclosed by the interferometer. The use of cold atoms inst...

The Brillouin shift and width for poly(acrylic acid) hydrogels have been obtained as a function of gel network volume fraction using a five-pass Fabry-Pdrot interferometer. A conspicuous peak has been observed in the Brillouin shift at high volume fraction. The results are discussed in the light of a theory for the Brillouin light-scattering from gels proposed by Marqusee and Deutch-