Quantum particles can work together to produce powerful signals. However, those signals are unstable and usually vanish almost instantly.
For decades, one striking example of this problem has been superradiance—a collective effect where many quantum particles emit energy together, producing an intense burst of radiation that rapidly dies out.
Now, researchers have shown that this long-standing weakness can be turned into a strength. In a new study, scientists demonstrate that superradiance can sustain itself, producing long-lived, highly coherent microwave signals without any external driving.
“This discovery changes how we think about the quantum world. We’ve shown that the very interactions once thought to disrupt quantum behavior can instead be harnessed to create it. That shift opens entirely new directions for quantum technologies,” Kae Nemoto, one of the study authors and Center Director of the Okinawa Institute of Science and Technology in Japan, said.
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