Once this $35 million upgrade is in place, LIGO will start using something called quantum "squeezed light." So, what does that mean exactly?

LIGO's Gravitational Wave Discovery Is Still In Question, But Why? -    • LIGO's Gravitational Wave Discovery I...  

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Gravitational-wave observatory LIGO set to double its detecting power
ttps://www.nature.com/articles/d41586-019-00573-4
"But the ALIGO+ upgrades will be more dramatic. If all goes to plan, LIGO will be able to detect neutron-star mergers that occur within 325 megaparsecs (around 1 billion light years) of Earth, says Ken Strain, a physicist at the University of Glasgow, UK, who leads a consortium of British universities that are expected to receive most of the UK money. That would nearly double the design sensitivity of 173 megaparsecs that LIGO expects to reach before the ALIGO+ upgrade."

LIGO Receives New Funding to Search for More Extreme Cosmic Events
https://www.ligo.caltech.edu/LA/news/...
"This award ensures that NSF's LIGO, which made the first historic detection of gravitational waves in 2015, will continue to lead in gravitational-wave science for the next decade," said Anne Kinney, assistant director for NSF's Mathematical and Physical Sciences Directorate, in a statement. "

GET READY FOR GRAVITATIONAL WAVES ALL DAY, EVERY DAY
https://www.wired.com/story/get-ready...
Another strategy to collect more signals is to build more observatories. Detectors in different locations that register the same signal help the researchers confirm that it’s from a gravitational wave. In addition, more detectors provide more coverage of the universe.

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