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Abstract:
Currently operating laser interferometric gravitational
wave detectors are limited by quantum noise above a few hundred
Hertz. Detectors that will come on line in the next decade
are predicted to be limited by quantum noise over their entire
useful frequency band (from 10 Hz to 10 kHz). Further sensitivity
improvements will, therefore, rely on using quantum optical
techniques such as squeezed state injection and quantum nondemolition,
which will, in turn, drive these massive mechanical
systems into quantum states. This article reviews the principles
behind these optical and quantum optical techniques and
progress toward there realization.
