Long-term stable squeezed vacuum state of light for gravitational wave detectors
نویسندگان
چکیده
Currently, the German/British gravitational wave detector GEO 600 is being upgraded in course of the GEO-HF program. One part of this upgrade consists of the integration of a squeezed light laser to nonclassically improve the detection sensitivity at frequencies where the instrument is limited by shot noise. This has been achieved recently [1]. The permanent employment of squeezed light in gravitational wave observatories requires a long-term stability of the generated squeezed state. In this paper, we discuss an unwanted mechanism that can lead to a varying squeezing factor along with a changing phase of the squeezed field. We present an extension of the implemented coherent control scheme [2] that allowed an increase in the long-term stability of the GEO 600 squeezed light laser. With it, a quantum noise reduction by more than 9 dB in the frequency band of 10 Hz – 10 kHz was observed over up to 20 hours with a duty cycle of more than 99 %. PACS numbers: 04.80.Nn, 42.50.Lc, 42.50.Dv, 42.65 Yj, 95.55.Ym ar X iv :1 10 9. 37 31 v1 [ qu an tph ] 1 6 Se p 20 11 Long-term stable squeezed vacuum state of light for gravitational wave detectors 2
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