Squeezed-light source to make gravitational wave detector even more sensitive

January 26, 2018, Max Planck Society
Together with their Virgo colleagues, the AEI researchers Harald Lück, Moritz Mehmet, and Henning Vahlbruch install the squeezed-light source, which was developed in Hannover, in a cleanroom at the Virgo gravitational-wave detector. Credit: H. Lück/B. Knispel/Max Planck Institute for Gravitational Physics

A team of researchers from the Max Planck Institute for Gravitational Physics (Albert Einstein Institute; AEI) in Hannover and from the Institute for Gravitational Physics at Leibniz Universität Hannover has developed an advanced squeezed-light source for the gravitational-wave detector Virgo near Pisa. Now, the Hannover scientists have delivered the setup, installed it, and handed it over to their Virgo colleagues. Beginning in autumn 2018 Virgo will use the squeezed-light source to listen to Einstein's gravitational waves together with the worldwide network of detectors with higher sensitivity than ever before.

"The German-British gravitational-wave detector GEO600 near Hannover has been routinely using a squeezed-light source since 2010. It has increased the part of the Universe that GEO600 listens to by a factor of up to four," says Prof. Karsten Danzmann, director at the AEI Hannover and director of the Institute for Gravitational Physics at Leibniz Universität Hannover. "The development and perfection of the cutting-edge technology is another successful chapter in the history of GEO600 as think thank of gravitational-wave research."

Both US LIGO instruments and the Virgo detector based in Tuscany are currently being upgraded and improved in preparation of the next joint observation run "O3" which is planned to commence in autumn 2018.

O3 is expected to usher in full-scale gravitational-wave astronomy through a large number of further gravitational-wave detections from merging binary black holes and additional signals from merging neutron star pairs.

For this purpose, Virgo has now received a valuable addition from Hannover: A setup called a squeezed-light source is expected to significantly increase Virgo's from the beginning of O3. The custom-made device is a permanent loan of the AEI to Virgo and is worth about 400,000 Euros.

The sensitivity of all interferometric gravitational-wave detectors (LIGO, Virgo, and GEO600) to the ripples of space-time from large cosmic events is fundamentally limited by quantum mechanical effects. They cause a background noise which overlaps with the gravitational-wave signal that is measured with laser light.

"This background noise is present even in complete darkness and can never be entirely removed. But we can change its properties – we call that squeezing – such that it interferes less with the gravitational-wave measurement," say Dr. Henning Vahlbruch and Dr. Moritz Mehmet from AEI Hannover. They have built and the squeezed-light source and installed it at the Virgo . "In a sense, our device creates a kind of darkness that is better than nature usually allows for. With this improved background noise we can increase the detectors' sensitivity."

The sensitivity of all interferometric gravitational-wave detectors can only be further increased in the future through the use of similar squeezed-light sources. Planned third-generation detectors like the Einstein Telescope will also depend on this technology.

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6 comments

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milnik
1 / 5 (3) Jan 28, 2018
Gravity and magnetism change with the basic phenomena that encounter the smallest possible substance of AETHER, which is propagated by infinite universes and includes the aggregate rocks of matter, formed by the separators. Like gravity and magnetism, each has its own action, and among them there is no correlation. Neither gravity nor magnetism have physical properties, so there are no gravitational waves. Another illogicality in measuring "GW" is that it claims that GW can be measured by lasers. How can it be said, where are lasers electro-magnetic waves and the gaps of gravitational waves?
Obviously, science has not yet come in and out of which matter is formed.
antialias_physorg
4.3 / 5 (6) Jan 28, 2018
Give it a rest Zeph. Aethere doesn't work, and you know it, too. Otherwise there would be one prediction that it could make which would deviate from known behaviors and could be measured. But it can't (instead it makes lots of predictions that are at odds with observation).

It's bollocks. Give it up. Stop wasting your (and everybody else's) time.
milnik
1 / 5 (3) Jan 28, 2018
If you do not understand this and do not understand, why think about this? It's not you who does not know anything about it, it's all science, and so you make countless variations and fabrications, about what you have no knowledge about. First, neither is science, at all unknown how and from which matter is formed, then how to know what is gravity and magnetization, which are inseparable connection of various forms of matter and of what the matter is formed. Do you deny that you have any relationship with the parents you became of, but I will not ask you the same for your parents. You must, as a human being, realize that there is somebody and something that has formed everything that you have composed and that governs with you. You did not have to be so tempted to neglect all this. WHO YOU KNOW ???
Nik_2213
5 / 5 (2) Jan 28, 2018
#M, you're spouting incoherent nonsense. You lack any clue how the process of scientific investigation works, think that ranting trumps millennia of rational thought. So, blocked again...
{Sigh}
milnik
not rated yet Jan 29, 2018
And you belong to the playwright of the scientific Inquisition. You think that science is when someone invents his theory and you all try to prove it for hundreds of years without success. And there is a disastrous fact that none of these "scientists" are trying to find out themselves and their existence and to understand who it is that formed us and everything in the universe of matter and energy. If you are so smart, publish your opinion on how and from what matter originated. I am trying to publish, detail, my works, but today there is no true science, but only tycoons and deceptions, lies, fabrications and stupidity such as BB, some complexity of space time and the like. It tells us how gravity and magnetism originate. It is easier to offend those who are incomprehensible to you, because they bring out what you will never understand.
milnik
not rated yet Jan 29, 2018
@Nik,
You all who have no idea what gravity, magnetism and matter are and how and from what they form, it would be good to try to understand it and then you can discuss these phenomena later. For you, these are "Spanish villages". And the complete science in this field has plunged deeply into anti-science because it does not know the structure of the universe, nor does it respect the Creators of everything in the MEEU, and not to mention how much they have affected their origin and origin. These "discoveries" of GV are fictions for many reasons.
One of the others is: the light travels only 130 million years and gv with that light, and exactly hit the LIGO ???

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