Postdoctoral research Wenxuan Jia PhD '24 and colleagues at the Laser Interferometer Gravitational-Wave Observatory (LIGO) have developed a way to reduce the impact of quantum noise by squeezing the laser light used in the detectors, enabling scientists to double the number of gravitational waves they can find, reports Karmela Padavic-Callaghan for New Scientist. “We realized that quantum noise will be limiting us a long time ago,” says Jia. “It’s not just a fancy [quantum] thing to demonstrate, it’s something that really affects the actual detector.” 

Senior Research Scientist Lisa Barsotti speaks with MIT Technology Review reporter Sophia Chen about how she and her colleagues developed a new device that uses quantum squeezing to help the LIGO detectors identify more celestial events, such as black hole mergers and neutron star collisions. “With these latest squeezing innovations, installed last year, the collaboration expects to detect gravitational waves up to 65% more frequently than before,” Chen explains.

Science News reporter James Riordon writes that by employing a new technology called frequency-dependent squeezing, LIGO detectors should now be able to identify about 60 more mergers between massive objects like black holes and neutron stars than before the upgrade. Senior research scientist Lisa Barsotti, who oversaw the development of this new technology, notes that even next-generation gravitational wave detectors will be able to benefit from quantum squeezing. “The beauty is you can do both. You can push the limit of what is possible from the technology of laser power and mirror [design],” Barsotti explains, “and then do squeezing on top of that.”

MIT researchers Lisa Barsotti, Deep Chatterjee and Victoria Xu speak with Curiosity Stream about how developments in gravitational wave detection are enabling a better understanding of the universe. Barsotti notes that in the future, gravitational wave science should help enable us to, “learn more about dark matter about primordial black holds to try to solve some of the biggest mysteries in our universe.” Xu notes, “the detection of gravitational waves is a completely new window that has opened into our universe.”

Prof. Nergis Mavalvala, dean of the MIT School of Science, and postdoc Victoria Xu speak with Nature reporter Davide Castelvecchi about the upgrades to the LIGO gravitational wave detectors that have significantly increased their sensitivity. “The improvements should allow the facility to pick up signals of colliding black holes every two to three days, compared with once a week or so during its previous run." 

Upgrades made to the LIGO gravitational wave detectors “will significantly boost the sensitivity of LIGO and should allow the facility to observe more-distant objects that produce smaller ripples in spacetime,” writes Pennsylvania State University Prof. Chad Hanna in a piece for The Conversation.

Prof. Nergis Mavalvala, dean of the MIT School of Science, speaks with Nobel Peace Prize laureate Malala Yousafzai about what inspired her love of science, how to inspire more women to pursue their passions and her hopes for the next generation of STEM students. “Working and building with my hands has always been something I’ve enjoyed doing,” says Mavalvala. “But I’ve also always been interested in the fundamental questions of why the universe is the way it is. I couldn’t have been more delighted when I discovered there was such a thing as experimental physics.”

Science Friday host Ira Flatow spotlights how Prof. Scott Hughes has shifted the wavelengths of gravitational waves into the range of human hearing, creating an audible experience that allows listeners to experience the “ripples in space-time made by the tremendous mass of colliding black holes.”

NPR’s Nell Greenfieldboyce spotlights how LIGO has helped to usher in a “big astronomy revolution” that is allowing scientists to listen to the universe. “The exciting thing is when you've got a new instrument, you know, a brand-new way of looking at things,” says Greenfieldboyce, “you don't know what you might detect that you never even thought of because until now, you just weren't able to look at the universe in this way.”

Researchers from MIT and other institutions have been able to observationally confirm one of Stephen Hawking’s theorems about black holes, measuring gravitational waves before and after a black hole merger to provide evidence that a black hole’s event horizon can never shrink, reports Caroline Delbert for Popular Mechanics. “This cool analysis doesn't just show an example of Hawking's theorem that underpins one of the central laws affecting black holes,” writes Delbert, “it shows how analyzing gravitational wave patterns can bear out statistical findings.”

Prof. Nergis Mavalvala, Dean of the School of Science, speaks with Becky Ferreira of Motherboard’s “Space Show” about LIGO’s 2015 discovery of gravitational waves and what researchers in the field have learned since then. “Every one of these observations tells us a little bit more about how nature has assembled our universe,” says Mavalvala. “Really, in the end, the question we're asking is: ‘How did this universe that we observe come about?”

Boston 25 spotlights how scientists from LIGO and Virgo have detected what may be the most massive black hole collision yet. “The result of the black holes colliding created the first-ever observed intermediate black hole, at 142 times the mass of the sun,” reports Boston 25.

Quanta Magazine reporter Thomas Lewton writes that a new study co-authored by Prof. Frank Wilczek explores how gravitons may create “noise” that could be identified by gravitational wave detectors. “There’s a kind of default consensus that it’s a waste of time to think about quantum effects and gravitational radiation,” said Wilczek. “There’s nothing like actual experimental results to focus the attention.”

Popular Science names “Advanced LIGO by MIT and CalTech (2016)” as one of the 20 best tech discoveries of the last decade. “LIGO has captivated people the world over, making them curious about esoteric subjects like the nature of space and origin of, well, everything.”

Marina Koren writes for The Atlantic about the continued importance of the discoveries that stem from the LIGO and Virgo laser experiments. “There is something called the gravitational-wave memory effect…that comes out of Einstein’s theory of relativity, but it would be nice to see that directly,” says Salvatore Vitale, a physics professor at MIT and a LIGO scientist.