A New Twist on Radio Waves

By now, you'd expect that communications engineers would have explored every trick in their century-old effort to cram more data into a limited number of frequencies. But researchers in Italy and Sweden have shown that there is still uncharted territory. A little-explored quantum property, they claim, has the potential to boost the number of channels available in a single-frequency microwave link, perhaps as much as elevenfold. © 2012 IEEE.