Seminar

Seminar Title	Using quantum non-demolition measurement of speed to enhance future generation GW detectors' ability to detect intermediate-mass black hole binaries
Speaker	Stefan Danilishin
Institute	AEI Hannover
Place	Hannover, AEI, Seminarraum 103
Start	27.07.2017 13:15

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The recent detection of gravitational waves from the two
colliding massive black holes in the event GW150914 at the two LIGO
interferometers has not only heralded the era of gravitational wave
astronomy, but has revealed the new population of heavy black holes
inconsistent with our previous knowledge based on X-ray observations.
This emphasised the importance of enhancing the sensitivity of GW
instruments in the low frequency band (1-30Hz) whereto such
intermediate-mass binary black hole systems radiate significant amount
of GW energy. In this range of frequencies, the dominant fundamental
noise source is quantum back-action produced by random fluctuations of
light intensity. In my talk, I will discuss how one can suppress this
low frequency component of quantum noise by turning the GW  detector
into a quantum non-demolition (QND) speed measuring device and thereby
increase the GW detection event rate thereof manyfold compared to the
conventional Michelson interferometer.