Now is the time to remind ourselves of the word ‘quantum’ in the title of our review. Thus far, the quantum
nature of laser light being used in the GW interferometers has not been accounted for in any
way. Nevertheless, quantum mechanics predicts striking differences for the variances of laser
light amplitude and phase fluctuations, depending on which quantum state it is in. Squeezed
vacuum [163, 99
, 136
, 38
, 90
] injection that has been recently implemented in the GEO 600
detector and has pushed the high-frequency part of the total noise down by 3.5 dB [151
, 1]
serves as a perfect example of this. In this section, we provide a brief introduction into the
quantization of light and the typical quantum states thereof that are common for the GW
interferometers.
http://www.livingreviews.org/lrr-2012-5 |
Living Rev. Relativity 15, (2012), 5
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