Squeezed Vacuum

Several years ago, physicists working on quantum optics were able to stop a light pulse and store it within a crystal for over a second, and then restart it, by turning off and on a coupling laser that renders the material transparet to the frequency of the pulse. Well, now two teams of researchers; that of Alexander Lvovsky of the University of Calgary, and that of Mikio Kozuma of the Tokyo Institute of Technology; have used similar techniques to store a particular quantum state called a “squeezed vacuum.” You can read about squeezed quantum states, including the squeezed vacuum here and here.
You can download both the Kozuma team paper and the Lvovsky team paper from arXiv.org.

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