Researchers at the Australian National University claim to have slowed light "all the way to a stop" in a cooled, rare-earth crystal that could serve as data storage in future quantum communications.
Using the crystal, which was surrounded in a magnetic field and cooled to -270 degrees Celsius, the researchers "stored" laser light for up to three microseconds with 69 percent efficiency.
This was no small feat, according to lead researcher Morgan Hedges, who noted that light normally would have traveled almost a kilometer in that time.
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