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Physics, Instrumentation and Detectors, physics.ins-det, Physics, Optics, physics.optics
Abstract:
Quantum noise will be the dominant noise source for the advanced laser
interferometric gravitational wave detectors currently under construction.
Squeezing-enhanced laser interferometers have been recently demonstrated as a
viable technique to reduce quantum noise. We propose two new methods of
generating an error signal for matching the longitudinal phase of squeezed
vacuum states of light to the phase of the laser interferometer output field.
Both provide a superior signal to the one used in previous demonstrations of
squeezing applied to a gravitational-wave detector. We demonstrate that the new
signals are less sensitive to misalignments and higher order modes, and result
in an improved stability of the squeezing level. The new signals also offer the
potential of reducing the overall rms phase noise and optical losses, each of
which would contribute to achieving a higher level of squeezing. The new error
signals are a pivotal development towards realizing the goal of 6 dB and more
of squeezing in advanced detectors and beyond.
