QUANTUM cryptography and quantum teleportation could become easier thanks to
a new way of spotting special photons, say scientists in Austria. The technique
allows researchers to separate ordinary photons from those that are mysteriously
“entangled” with a distant twin. “This separation is crucial for quantum
communications,” says Richard Hughes, a physicist at the Los Alamos National
Laboratory in New Mexico.
Entangled photons are the Siamese twins of the quantum world. According to
the laws of quantum mechanics, they are linked in such a fundamental way that
carrying out a measurement on one determines the state of the other, no matter…
